Your Smart IOT

Two more LEDs – tutorial simple part 2

Wall's Corners

Link Author

Title: Two more LEDs – tutorial simple part 2
Author: Wall's Corners
Rating 5 of 5 Des:

No surprises here – add 2 more LEDs to the board as shown below: Added two more LEDs Three LEDs on the breadboard They are wired up a...

<p>No surprises here – add 2 more LEDs to the board as shown below:</p>
<div id="attachment_383" class="wp-caption aligncenter"><a href="http://bit.ly/1S4RuHg" target="_blank"><img alt="Added two more LEDs" class="wp-image-383" height="215" src="http://bit.ly/1Yqnv3J" title="Added two more LEDs" width="300" /></a>
<p class="wp-caption-text">Added two more LEDs</p>
</div>
<div id="attachment_848" class="wp-caption aligncenter"><a href="http://bit.ly/1S4R97j" target="_blank"><img alt="Three LEDs on the breadboard" class="size-medium wp-image-848" height="300" sizes="(max-width: 272px) 100vw, 272px" src="http://bit.ly/1YqnRrb" srcset="http://bit.ly/1YqnRrb 272x, http://bit.ly/1S4REOU 928x, http://bit.ly/1S4R97j 1079x" title="Three LEDs on the breadboard" width="272" /></a>
<p class="wp-caption-text">Three LEDs on the breadboard</p>
</div>
<p>They are wired up as before with the Yellow LED being connected to <em><strong>wiringPi</strong></em> pin 1 (GPIO-18) and the Green LED on <em><strong>wiringPi</strong></em> pin 2 (GPIO-21)</p>
<p>Test with the <em><strong>gpio</strong></em> program as before. e.g.</p>
<pre>
gpio mode 0 out
gpio mode 1 out
gpio mode 2 out
gpio write 0 1
gpio write 1 1
gpio write 2 1
</pre>
<p>to turn the all on.</p>
<p>If you want to do this somewhat easier, then we can use the shell programming system:</p>
<pre>
for i in 0 1 2 ; do gpio mode $i out; done
for i in 0 1 2 ; do gpio write $i 1; done
for i in 0 1 2 ; do gpio write $i 0; done
</pre>
<p>to do this using the <a href="http://bit.ly/26nCnnf" itemprop="url" target="_bank" title="GPIO"><strong>GPIO</strong></a> pins:</p>
<pre>
for i in 17 18 21 ; do gpio -g write $i 1; done
</pre>
<p>If the above doesn’t make sense to you, then don’t worry for now.</p>
<div id="huge-it-share-buttons-top" class="huge-it-share-buttons nobackground">
<h3>Share This:</h3>
<ul class="huge-it-share-buttons-list">
<li class=" nobackground"><a href="http://bit.ly/1XReO0c" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1XReO0c','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -0px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="https://twitter.com/share?status=http://yoursmart.mobi/feed&text=Two%20more%20LEDs%20%E2%80%93%20tutorial%20simple%20part%202" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('https://twitter.com/share?status=http://yoursmart.mobi/feed&text=Two more LEDs – tutorial simple part 2','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -30px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://bit.ly/1S4Rpn0%20more%20LEDs%20%E2%80%93%20tutorial%20simple%20part%202" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1S4Rpn0 more LEDs – tutorial simple part 2','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -60px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://bit.ly/1XReO0d" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1XReO0d','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -90px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://bit.ly/1Yqoelx%20more%20LEDs%20%E2%80%93%20tutorial%20simple%20part%202&mini=true&url=http://bit.ly/1XReO0g" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1Yqoelx more LEDs – tutorial simple part 2&mini=true&url=http://bit.ly/1XReO0g','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -120px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://bit.ly/1S4QO4B%20more%20LEDs%20%E2%80%93%20tutorial%20simple%20part%202" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1S4QO4B more LEDs – tutorial simple part 2','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -150px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://di.gg/1YqoeC3%20more%20LEDs%20%E2%80%93%20tutorial%20simple%20part%202" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://di.gg/1YqoeC3 more LEDs – tutorial simple part 2','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -180px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://stumble.it/1S4RHKu%20more%20LEDs%20%E2%80%93%20tutorial%20simple%20part%202" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://stumble.it/1S4RHKu more LEDs – tutorial simple part 2','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -210px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://bit.ly/1XReO0l" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1XReO0l','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -240px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://bit.ly/1Yqn1L8%20more%20LEDs%20%E2%80%93%20tutorial%20simple%20part%202" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1Yqn1L8 more LEDs – tutorial simple part 2','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -270px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://bit.ly/1S4S3Rm%20more%20LEDs%20%E2%80%93%20tutorial%20simple%20part%202" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1S4S3Rm more LEDs – tutorial simple part 2','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -300px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://bit.ly/1VNpzTU" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1VNpzTU','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -330px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://bit.ly/1YqmXLk%20more%20LEDs%20%E2%80%93%20tutorial%20simple%20part%202" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1YqmXLk more LEDs – tutorial simple part 2','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -360px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://bit.ly/1VNpzTX" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1VNpzTX','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -390px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://bit.ly/1S4RUNV%20more%20LEDs%20%E2%80%93%20tutorial%20simple%20part%202" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1S4RUNV more LEDs – tutorial simple part 2','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -420px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://bit.ly/1YqmZmq%20more%20LEDs%20%E2%80%93%20tutorial%20simple%20part%202&pic=&ralateUid=&" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1YqmZmq more LEDs – tutorial simple part 2&pic=&ralateUid=&','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -450px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://bit.ly/1S4RV4t%20more%20LEDs%20%E2%80%93%20tutorial%20simple%20part%202" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1S4RV4t more LEDs – tutorial simple part 2','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -480px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://bit.ly/1Yqm4lT%20more%20LEDs%20%E2%80%93%20tutorial%20simple%20part%202" id="backforunical796" name="backforunical796" onclick="javascript:void window.open('http://bit.ly/1Yqm4lT more LEDs – tutorial simple part 2','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -510px -120px" target="_blank"></a></li>
</ul>
<div class="clear"></div>
</div>
View more at: <a href="http://bit.ly/1XReQFr">http://bit.ly/1XReQFr</a>

Two more LEDs – tutorial simple part 2

No surprises here – add 2 more LEDs to the board as shown below: Added two more LEDs Three LEDs on the breadboard They are wired up a...

Two more LEDs – tutorial simple part 2

Wall's Corners

Link Author

Title: Two more LEDs – tutorial simple part 2
Author: Wall's Corners
Rating 5 of 5 Des:

No surprises here – add 2 more LEDs to the board as shown below: Added two more LEDs Three LEDs on the breadboard They are wired up a...

Two more LEDs – tutorial simple part 2

No surprises here – add 2 more LEDs to the board as shown below: Added two more LEDs Three LEDs on the breadboard They are wired up a...

Make a Stevenson Screen with Arduino Part 1

Wall's Corners

Link Author

Title: Make a Stevenson Screen with Arduino Part 1
Author: Wall's Corners
Rating 5 of 5 Des:

The last time, we used the Arduino as a Web server . In the next few entries, we will aim to expand the Web server by building a Stevenson ...

<p>The last time, we used the <strong>Arduino as a Web server</strong>. In the next few entries, we will aim to expand the Web server by building a Stevenson screen. While there are thermometers and hydrometers in a Stevenson screen, this time, we will be building a Stevenson screen for indoor use, using optical and ultrasonic sensors used previously, so that besides temperature and humidity, it is capable of sensing the indoor environment.</p>
<p><img alt="2014-08-29-14.53.39-e1409555341163" class="alignnone wp-image-522 size-full" height="394" src="http://ift.tt/1r81334" width="700" /></p>
<p>We aim to be able to store the data collected by the Stevenson screen in an SD card, and integrate it with a server-side program through the Web server.</p>
<p>In this article, we will se how to operate the temperature sensor with <a href="http://ift.tt/25oS3pH" itemprop="url" target="_bank" title="Arduino"><strong>Arduino</strong></a>. We will combine it with the Web server light sensor used previously.</p>
<h2>Today’s Electronics Recipe</h2>
<p>Estimated time to complete: 45 minutes<br />
Parts needed:</p>
<ul>
<li>Arduino (Arduino Uno R3) <a href="http://ift.tt/19qjkOK" target="_blank">http://ift.tt/19qjkOK</a></li>
<li>Breadboard <a href="http://ift.tt/1z7Tzip" target="_blank">http://ift.tt/1z7Tzip</a></li>
<li>Temperature sensor (LM35DZ)</li>
<li>7-segment <a href="http://ift.tt/1Rq2vDU" itemprop="url" target="_bank" title="LED"><strong>LED</strong></a> NAR161-B (high intensity red, 7-segment LED display, common anode)</li>
<li>Resistor (220Ω)</li>
</ul>
<h3>How to use the temperature sensor</h3>
<p>While there are many types of temperature sensors, we will be using the common LM35DZ.</p>
<p><img alt="2014-08-28-23.26.23-e1409555477202" class="alignnone size-full wp-image-523" height="394" src="http://ift.tt/1r811bt" width="700" /></p>
<p>Temperature sensor LM35DZ</p>
<p>Compared to other sensors, temperature sensors are easy to use. The LM35DZ is able to measure temperatures from 0℃ to 100℃, giving an output of 0V when the temperature is 0℃, 10mv at 1℃, and 100mV at 10℃.</p>
<p>As Arduino can receive analog inputs with values from 0 to 1023, it is possible to measure temperature using Arduino with the following formula.</p>
<p><strong>Temperature = (([Base voltage(5V)] * [input value from analog pin]) / 1024) * 100;</strong></p>
<p>Let’s connect this up to the Arduino.</p>
<p>The temperature sensor is connected as per the picture below.</p>
<p><img alt="5vs" class="alignnone size-full wp-image-524" height="369" src="http://ift.tt/1qAdcwP" width="700" /></p>
<p>With the flat part on top, from the left: +Vs, Vout, GND</p>
<p><img alt="fig" class="alignnone size-full wp-image-526" height="512" src="http://ift.tt/1r811bx" width="473" /></p>
<p><img alt="2014-08-29-02.22.13-e1409557281714" class="alignnone size-full wp-image-525" height="394" src="http://ift.tt/1qAdaVS" width="700" /></p>
<div>
<div id="highlighter_302756" class="syntaxhighlighter cpp">
<table border="0" cellspacing="0" cellpadding="0">
<caption>Code-Example</caption>
<tbody>
<tr>
<td class="gutter">
<div class="line number1 index0 alt2">1</div>
<div class="line number2 index1 alt1">2</div>
<div class="line number3 index2 alt2">3</div>
<div class="line number4 index3 alt1">4</div>
<div class="line number5 index4 alt2">5</div>
<div class="line number6 index5 alt1">6</div>
<div class="line number7 index6 alt2">7</div>
<div class="line number8 index7 alt1">8</div>
<div class="line number9 index8 alt2">9</div>
<div class="line number10 index9 alt1">10</div>
<div class="line number11 index10 alt2">11</div>
<div class="line number12 index11 alt1">12</div>
<div class="line number13 index12 alt2">13</div>
<div class="line number14 index13 alt1">14</div>
<div class="line number15 index14 alt2">15</div>
<div class="line number16 index15 alt1">16</div>
<div class="line number17 index16 alt2">17</div>
<div class="line number18 index17 alt1">18</div>
<div class="line number19 index18 alt2">19</div>
</td>
<td class="code">
<div class="container">
<div class="line number1 index0 alt2"><code class="cpp comments">//</code></div>
<div class="line number2 index1 alt1"><code class="cpp comments">// Program to display the temperature sensor value on serial monitor</code></div>
<div class="line number3 index2 alt2"><code class="cpp comments">//</code></div>
<div class="line number4 index3 alt1"><code class="cpp color1 bold">int</code> <code class="cpp plain">sensorPin = A0;</code> <code class="cpp comments">// using analog pin 0</code></div>
<div class="line number5 index4 alt2"><code class="cpp color1 bold">int</code> <code class="cpp plain">sensorValue = 0;</code></div>
<div class="line number6 index5 alt1"><code class="cpp keyword bold">void</code> <code class="cpp plain">setup() {</code></div>
<div class="line number7 index6 alt2"><code class="cpp plain">Serial.begin(9600);</code> <code class="cpp comments">// setting to display on serial monitor</code></div>
<div class="line number8 index7 alt1"><code class="cpp plain">}</code></div>
<div class="line number9 index8 alt2"><code class="cpp keyword bold">void</code> <code class="cpp plain">loop() {</code></div>
<div class="line number10 index9 alt1"><code class="cpp plain">sensorValue = analogRead(sensorPin);</code> <code class="cpp comments">// getting input from analog pin 0</code></div>
<div class="line number11 index10 alt2"><code class="cpp color1 bold">float</code> <code class="cpp plain">temp = modTemp(sensorValue);</code> <code class="cpp comments">// converting input values from the temperature sensor</code></div>
<div class="line number12 index11 alt1"><code class="cpp plain">Serial.println(temp);</code> <code class="cpp comments">// displaying results on serial monitor</code></div>
<div class="line number13 index12 alt2"><code class="cpp plain">delay(500);</code> <code class="cpp comments">// 0.5 second delay</code></div>
<div class="line number14 index13 alt1"><code class="cpp plain">}</code></div>
<div class="line number15 index14 alt2"><code class="cpp comments">// converting analog input value to ℃</code></div>
<div class="line number16 index15 alt1"><code class="cpp color1 bold">float</code> <code class="cpp plain">modTemp(</code><code class="cpp color1 bold">int</code> <code class="cpp plain">analog_val){</code></div>
<div class="line number17 index16 alt2"><code class="cpp color1 bold">float</code> <code class="cpp plain">v = 5;</code> <code class="cpp comments">// base voltage (V)</code></div>
<div class="line number18 index17 alt1"><code class="cpp color1 bold">float</code> <code class="cpp plain">tempC = ((v * analog_val) / 1024) * 100;</code> <code class="cpp comments">// conversion to Celsius</code></div>
<div class="line number19 index18 alt2"><code class="cpp keyword bold">return</code> <code class="cpp plain">tempC;</code></div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<p><img alt="f92b43078d19f73a01485426adea25ef-e1409557333163" class="alignnone size-full wp-image-527" height="505" src="http://ift.tt/1r811bB" width="700" /></p>
<p>Display on serial monitor</p>
<p>Using the serial monitor ([Tool]-[Serial monitor]), also used in the <a href="http://ift.tt/1qAdaVU" target="_blank">article about the light sensor</a>, to display the current temperature on the screen!</p>
<p>Looking at the program, besides the setup() and loop() functions, the modTemp() function also appears in the program. The process can be to some degree consolidated into functions.</p>
<h2>Structure of Functions</h2>
<p><strong>[return value type] [function name]([parameters]){</strong><br />
<strong>〜define the processing here〜</strong><br />
<strong>return [value to return];</strong></p>
<p>Example:</p>
<div>
<div id="highlighter_535971" class="syntaxhighlighter cpp">
<table border="0" cellspacing="0" cellpadding="0">
<caption>Code-Example</caption>
<tbody>
<tr>
<td class="gutter">
<div class="line number1 index0 alt2">1</div>
<div class="line number2 index1 alt1">2</div>
<div class="line number3 index2 alt2">3</div>
<div class="line number4 index3 alt1">4</div>
<div class="line number5 index4 alt2">5</div>
<div class="line number6 index5 alt1">6</div>
<div class="line number7 index6 alt2">7</div>
<div class="line number8 index7 alt1">8</div>
</td>
<td class="code">
<div class="container">
<div class="line number1 index0 alt2"><code class="cpp plain">loop(){</code></div>
<div class="line number2 index1 alt1"><code class="cpp color1 bold">int</code> <code class="cpp plain">result01 = testFunc(1,2);</code></div>
<div class="line number3 index2 alt2"><code class="cpp color1 bold">int</code> <code class="cpp plain">result02 = testFunc(3,4);</code></div>
<div class="line number4 index3 alt1"><code class="cpp plain">}</code></div>
<div class="line number5 index4 alt2"><code class="cpp color1 bold">int</code> <code class="cpp plain">testFunc(</code><code class="cpp color1 bold">int</code> <code class="cpp plain">A,</code> <code class="cpp color1 bold">int</code> <code class="cpp plain">B){</code></div>
<div class="line number6 index5 alt1"><code class="cpp color1 bold">int</code> <code class="cpp plain">C = A + B;</code></div>
<div class="line number7 index6 alt2"><code class="cpp keyword bold">return</code> <code class="cpp plain">C;</code></div>
<div class="line number8 index7 alt1"><code class="cpp plain">}</code></div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<p>Process flow and results: Calling of function “testFunc” within “loop”, and returning the results of the processing by “testFunc” in “result01” and “result02” based on the parameters passed. Value in “result01” is 3 and “result02” is 7.</p>
<div class="ezAdsense adsense adsense-midtext" style="text-align:center;margin:12px;"><script async="" src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js" type="text/javascript">
</script> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-2979805726071943" data-ad-slot="7471922310" data-ad-format="auto"></ins> <script type="text/javascript">
//<![CDATA[
(adsbygoogle = window.adsbygoogle || []).push({});
//]]>
</script></div>
<p>As the program gets longer, using functions will allow to consolidate the process, avoid the code repetitions, and make the change needed directly in the functions. So, let’s try to use functions when there is similar process to be carried out.</p>
<p>This is all we need to us the temperature sensor. Easy, right?</p>
<h2>Installation on the Web server</h2>
<p>Let’s install the temperature sensor on the Web server that we’ve built previously.</p>
<p> </p>
<p><img alt="lightsensor" class="alignnone size-full wp-image-528" height="548" src="http://ift.tt/1r811bD" width="518" /></p>
<p><img alt="2014-08-29-05.52.03-e1409570177197" class="alignnone size-full wp-image-529" height="394" src="http://ift.tt/1qAdcwT" width="700" /></p>
<p> </p>
<div>
<div id="highlighter_15731" class="syntaxhighlighter cpp">
<table border="0" cellspacing="0" cellpadding="0">
<caption>Code-Example</caption>
<tbody>
<tr>
<td class="gutter">
<div class="line number1 index0 alt2">1</div>
<div class="line number2 index1 alt1">2</div>
<div class="line number3 index2 alt2">3</div>
<div class="line number4 index3 alt1">4</div>
<div class="line number5 index4 alt2">5</div>
<div class="line number6 index5 alt1">6</div>
<div class="line number7 index6 alt2">7</div>
<div class="line number8 index7 alt1">8</div>
<div class="line number9 index8 alt2">9</div>
<div class="line number10 index9 alt1">10</div>
<div class="line number11 index10 alt2">11</div>
<div class="line number12 index11 alt1">12</div>
<div class="line number13 index12 alt2">13</div>
<div class="line number14 index13 alt1">14</div>
<div class="line number15 index14 alt2">15</div>
<div class="line number16 index15 alt1">16</div>
<div class="line number17 index16 alt2">17</div>
<div class="line number18 index17 alt1">18</div>
<div class="line number19 index18 alt2">19</div>
<div class="line number20 index19 alt1">20</div>
<div class="line number21 index20 alt2">21</div>
<div class="line number22 index21 alt1">22</div>
<div class="line number23 index22 alt2">23</div>
<div class="line number24 index23 alt1">24</div>
<div class="line number25 index24 alt2">25</div>
<div class="line number26 index25 alt1">26</div>
<div class="line number27 index26 alt2">27</div>
<div class="line number28 index27 alt1">28</div>
<div class="line number29 index28 alt2">29</div>
<div class="line number30 index29 alt1">30</div>
<div class="line number31 index30 alt2">31</div>
<div class="line number32 index31 alt1">32</div>
<div class="line number33 index32 alt2">33</div>
<div class="line number34 index33 alt1">34</div>
<div class="line number35 index34 alt2">35</div>
<div class="line number36 index35 alt1">36</div>
<div class="line number37 index36 alt2">37</div>
<div class="line number38 index37 alt1">38</div>
<div class="line number39 index38 alt2">39</div>
<div class="line number40 index39 alt1">40</div>
<div class="line number41 index40 alt2">41</div>
<div class="line number42 index41 alt1">42</div>
<div class="line number43 index42 alt2">43</div>
<div class="line number44 index43 alt1">44</div>
<div class="line number45 index44 alt2">45</div>
<div class="line number46 index45 alt1">46</div>
<div class="line number47 index46 alt2">47</div>
<div class="line number48 index47 alt1">48</div>
<div class="line number49 index48 alt2">49</div>
<div class="line number50 index49 alt1">50</div>
<div class="line number51 index50 alt2">51</div>
<div class="line number52 index51 alt1">52</div>
<div class="line number53 index52 alt2">53</div>
<div class="line number54 index53 alt1">54</div>
<div class="line number55 index54 alt2">55</div>
<div class="line number56 index55 alt1">56</div>
<div class="line number57 index56 alt2">57</div>
<div class="line number58 index57 alt1">58</div>
<div class="line number59 index58 alt2">59</div>
<div class="line number60 index59 alt1">60</div>
<div class="line number61 index60 alt2">61</div>
<div class="line number62 index61 alt1">62</div>
<div class="line number63 index62 alt2">63</div>
<div class="line number64 index63 alt1">64</div>
<div class="line number65 index64 alt2">65</div>
<div class="line number66 index65 alt1">66</div>
<div class="line number67 index66 alt2">67</div>
<div class="line number68 index67 alt1">68</div>
<div class="line number69 index68 alt2">69</div>
<div class="line number70 index69 alt1">70</div>
<div class="line number71 index70 alt2">71</div>
<div class="line number72 index71 alt1">72</div>
<div class="line number73 index72 alt2">73</div>
<div class="line number74 index73 alt1">74</div>
<div class="line number75 index74 alt2">75</div>
<div class="line number76 index75 alt1">76</div>
<div class="line number77 index76 alt2">77</div>
</td>
<td class="code">
<div class="container">
<div class="line number1 index0 alt2"><code class="cpp comments">//</code></div>
<div class="line number2 index1 alt1"><code class="cpp comments">// Program to display temperature sensor and <a href="http://ift.tt/1SDfTEN" itemprop="url" target="_bank" title="light"><strong>light</strong></a> sensor through the Web server</code></div>
<div class="line number3 index2 alt2"><code class="cpp comments">//</code></div>
<div class="line number4 index3 alt1"><code class="cpp preprocessor">#include <SPI.h></code></div>
<div class="line number5 index4 alt2"><code class="cpp preprocessor">#include <Ethernet.h></code></div>
<div class="line number6 index5 alt1"><code class="cpp plain">byte mac[] = {</code></div>
<div class="line number7 index6 alt2"><code class="cpp plain">0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };</code> <code class="cpp comments">// specifying the MAC address on the Ethernet shield</code></div>
<div class="line number8 index7 alt1"><code class="cpp plain">IPAddress ip(192,168,0,177);</code> <code class="cpp comments">// specifying the IP address assigned to the Arduino server</code></div>
<div class="line number9 index8 alt2"><code class="cpp plain">EthernetServer server(80);</code> <code class="cpp comments">// specifying the server port (no issue to keep as 80 as we are using HTTP)</code></div>
<div class="line number10 index9 alt1"><code class="cpp keyword bold">void</code> <code class="cpp plain">setup() {</code></div>
<div class="line number11 index10 alt2"><code class="cpp comments">// Open serial communications and wait for port to open:</code></div>
<div class="line number12 index11 alt1"><code class="cpp plain">Serial.begin(9600);</code></div>
<div class="line number13 index12 alt2"><code class="cpp keyword bold">while</code> <code class="cpp plain">(!Serial) {</code></div>
<div class="line number14 index13 alt1"><code class="cpp plain">;</code> <code class="cpp comments">// wait for serial port to connect. Needed for Leonardo only</code></div>
<div class="line number15 index14 alt2"><code class="cpp plain">}</code></div>
<div class="line number16 index15 alt1"><code class="cpp plain">Ethernet.begin(mac, ip);</code> <code class="cpp comments">// testing connection with Ethernet shield</code></div>
<div class="line number17 index16 alt2"><code class="cpp plain">server.begin();</code></div>
<div class="line number18 index17 alt1"><code class="cpp plain">Serial.print(</code><code class="cpp string">"server is at "</code><code class="cpp plain">);</code></div>
<div class="line number19 index18 alt2"><code class="cpp plain">Serial.println(Ethernet.localIP());</code></div>
<div class="line number20 index19 alt1"><code class="cpp plain">}</code></div>
<div class="line number21 index20 alt2"><code class="cpp keyword bold">void</code> <code class="cpp plain">loop() {</code></div>
<div class="line number22 index21 alt1"><code class="cpp plain">EthernetClient client = server.available();</code> <code class="cpp comments">// monitor for external connections to the server</code></div>
<div class="line number23 index22 alt2"><code class="cpp keyword bold">if</code> <code class="cpp plain">(client) {</code></div>
<div class="line number24 index23 alt1"><code class="cpp plain">Serial.println(</code><code class="cpp string">"new client"</code><code class="cpp plain">);</code></div>
<div class="line number25 index24 alt2"><code class="cpp comments">// an http request ends with a blank line</code></div>
<div class="line number26 index25 alt1"><code class="cpp plain">boolean currentLineIsBlank =</code> <code class="cpp keyword bold">true</code><code class="cpp plain">;</code></div>
<div class="line number27 index26 alt2"><code class="cpp keyword bold">while</code> <code class="cpp plain">(client.connected()) {</code></div>
<div class="line number28 index27 alt1"><code class="cpp keyword bold">if</code> <code class="cpp plain">(client.available()) {</code></div>
<div class="line number29 index28 alt2"><code class="cpp color1 bold">char</code> <code class="cpp plain">c = client.read();</code></div>
<div class="line number30 index29 alt1"><code class="cpp plain">Serial.write(c);</code></div>
<div class="line number31 index30 alt2"><code class="cpp keyword bold">if</code> <code class="cpp plain">(c ==</code> <code class="cpp string">'\n'</code> <code class="cpp plain">&& currentLineIsBlank) {</code></div>
<div class="line number32 index31 alt1"><code class="cpp comments">// send a standard http response header</code></div>
<div class="line number33 index32 alt2"><code class="cpp plain">client.println(</code><code class="cpp string">"HTTP/1.1 200 OK"</code><code class="cpp plain">);</code></div>
<div class="line number34 index33 alt1"><code class="cpp plain">client.println(</code><code class="cpp string">"Content-Type: text/html"</code><code class="cpp plain">);</code></div>
<div class="line number35 index34 alt2"><code class="cpp plain">client.println(</code><code class="cpp string">"Connection: close"</code><code class="cpp plain">);</code> <code class="cpp comments">// the connection will be closed after completion of the response</code></div>
<div class="line number36 index35 alt1"><code class="cpp plain">client.println(</code><code class="cpp string">"Refresh: 3"</code><code class="cpp plain">);</code> <code class="cpp comments">// refresh the page <a href="http://ift.tt/1UDKUyD" itemprop="url" target="_bank" title="How to automatically water your plants with the Raspberry Pi"><strong>automatically</strong></a> every 5 sec</code></div>
<div class="line number37 index36 alt2"><code class="cpp plain">client.println();</code></div>
<div class="line number38 index37 alt1"><code class="cpp plain">client.println(</code><code class="cpp string">"<!DOCTYPE HTML>"</code><code class="cpp plain">);</code></div>
<div class="line number39 index38 alt2"><code class="cpp plain">client.println(</code><code class="cpp string">"<html>"</code><code class="cpp plain">);</code></div>
<div class="line number40 index39 alt1"><code class="cpp comments">// A) input from each sensor</code></div>
<div class="line number41 index40 alt2"><code class="cpp comments">// input from optical sensor</code></div>
<div class="line number42 index41 alt1"><code class="cpp color1 bold">int</code> <code class="cpp plain">sensorReading = analogRead(0);</code> <code class="cpp comments">// analog pin 0</code></div>
<div class="line number43 index42 alt2"><code class="cpp plain">client.print(</code><code class="cpp string">"Light:"</code><code class="cpp plain">);</code></div>
<div class="line number44 index43 alt1"><code class="cpp plain">client.print(sensorReading);</code></div>
<div class="line number45 index44 alt2"><code class="cpp plain">client.println(</code><code class="cpp string">"<br />"</code><code class="cpp plain">);</code></div>
<div class="line number46 index45 alt1"><code class="cpp plain">delay(50);</code></div>
<div class="line number47 index46 alt2"><code class="cpp comments">// input from temperature sensor</code></div>
<div class="line number48 index47 alt1"><code class="cpp plain">sensorReading = analogRead(1);</code> <code class="cpp comments">// analog pin 1</code></div>
<div class="line number49 index48 alt2"><code class="cpp plain">client.print(</code><code class="cpp string">"Temp:"</code><code class="cpp plain">);</code></div>
<div class="line number50 index49 alt1"><code class="cpp plain">client.print(modTemp(sensorReading));</code></div>
<div class="line number51 index50 alt2"><code class="cpp plain">client.println(</code><code class="cpp string">"<br />"</code><code class="cpp plain">);</code></div>
<div class="line number52 index51 alt1"><code class="cpp plain">client.println(</code><code class="cpp string">"</html>"</code><code class="cpp plain">);</code></div>
<div class="line number53 index52 alt2"><code class="cpp keyword bold">break</code><code class="cpp plain">;</code></div>
<div class="line number54 index53 alt1"><code class="cpp plain">}</code></div>
<div class="line number55 index54 alt2"><code class="cpp keyword bold">if</code> <code class="cpp plain">(c ==</code> <code class="cpp string">'\n'</code><code class="cpp plain">) {</code></div>
<div class="line number56 index55 alt1"><code class="cpp comments">// you're starting a new line</code></div>
<div class="line number57 index56 alt2"><code class="cpp plain">currentLineIsBlank =</code> <code class="cpp keyword bold">true</code><code class="cpp plain">;</code></div>
<div class="line number58 index57 alt1"><code class="cpp plain">}</code></div>
<div class="line number59 index58 alt2"><code class="cpp keyword bold">else</code> <code class="cpp keyword bold">if</code> <code class="cpp plain">(c !=</code> <code class="cpp string">'\r'</code><code class="cpp plain">) {</code></div>
<div class="line number60 index59 alt1"><code class="cpp comments">// you've gotten a character on the current line</code></div>
<div class="line number61 index60 alt2"><code class="cpp plain">currentLineIsBlank =</code> <code class="cpp keyword bold">false</code><code class="cpp plain">;</code></div>
<div class="line number62 index61 alt1"><code class="cpp plain">}</code></div>
<div class="line number63 index62 alt2"><code class="cpp plain">}</code></div>
<div class="line number64 index63 alt1"><code class="cpp plain">}</code></div>
<div class="line number65 index64 alt2"><code class="cpp comments">// give the web browser time to receive the data</code></div>
<div class="line number66 index65 alt1"><code class="cpp plain">delay(1);</code></div>
<div class="line number67 index66 alt2"><code class="cpp comments">// close the connection:</code></div>
<div class="line number68 index67 alt1"><code class="cpp plain">client.stop();</code></div>
<div class="line number69 index68 alt2"><code class="cpp plain">Serial.println(</code><code class="cpp string">"client disonnected"</code><code class="cpp plain">);</code></div>
<div class="line number70 index69 alt1"><code class="cpp plain">}</code></div>
<div class="line number71 index70 alt2"><code class="cpp plain">}</code></div>
<div class="line number72 index71 alt1"><code class="cpp comments">// B) converting analog input value to ℃</code></div>
<div class="line number73 index72 alt2"><code class="cpp color1 bold">float</code> <code class="cpp plain">modTemp(</code><code class="cpp color1 bold">int</code> <code class="cpp plain">analog_val){</code></div>
<div class="line number74 index73 alt1"><code class="cpp color1 bold">float</code> <code class="cpp plain">v = 5;</code> <code class="cpp comments">// base voltage (V)</code></div>
<div class="line number75 index74 alt2"><code class="cpp color1 bold">float</code> <code class="cpp plain">tempC = ((v * analog_val) / 1024) * 100;</code> <code class="cpp comments">// conversion to Celsius</code></div>
<div class="line number76 index75 alt1"><code class="cpp keyword bold">return</code> <code class="cpp plain">tempC;</code></div>
<div class="line number77 index76 alt2"><code class="cpp plain">}</code></div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<p>The parts in red are what has changed from the program previously used for the Web server. Using part A to get the actual analog value (previously used for “for” statement), and part B to define the function to convert the temperature value, it is possible to display the values from the two sensors.</p>
<p>Once you are ready with the program, try displaying it in your browser.</p>
<p><img alt="6d3b02a0a26f9863ef645556093e4bbf" class="alignnone size-full wp-image-530" height="143" src="http://ift.tt/1r811rV" width="289" /></p>
<p>We are one step closer to our Stevenson screen!</p>
<h2>Display of Arduino Data</h2>
<p>After using Arduino, you may have realized that there are many methods for displaying data. You can use Arduino and display the data through parts such as LED, on a PC through serial monitors, via the Ethernet shield through a network, and etc. There are many display methods, but in this example, as we build the Stevenson screen, what would be an interesting way to display data obtained? After all the trouble to set up a Web server with an Ethernet shield, it would be interesting to be able to display the data on a smart phone.<br />
Whether it is interesting or boring depends on the display method. Let’s try displaying the input values using an electrical component known as a 7-segment LED.</p>
<p>* There will be a detailed explanation on how to use a 7-segment LED next time.</p>
<h2>Attempt to display the temperature sensor value on 7-segment LED</h2>
<p>When operating Arduino using power adapters, you cannot see the serial monitor. For those who want to see the sensor values immediately, try setting up a 7-segment LED. It can display the analog input value as a numerical value.</p>
<p><img alt="2014-08-29-05.10.12-e1409570497886" class="alignnone wp-image-531 size-full" height="394" src="http://ift.tt/1qAdcwX" width="700" /></p>
<p>7-segment LED</p>
<p><iframe width="678" height="381" src="https://www.youtube.com/embed/O0qd768FV1M?feature=oembed" frameborder="0" allowfullscreen=""></iframe></p>
<p>Testing a 7-segment LED using a test count-up program</p>
<h2>How to use a 7-segment LED</h2>
<p>Let’s try using the 7-segment LED to display the value of the temperature sensor. Trying to use the 7-segment LED as it is led to the value inside the circuit overflowing, making the Arduino into something like a bomb <img alt=":)" class="wp-smiley" src="http://ift.tt/1r813ju" /></p>
<p><iframe width="678" height="381" src="https://www.youtube.com/embed/wKIJIbcRWzY?feature=oembed" frameborder="0" allowfullscreen=""></iframe></p>
<p>Displaying the value of the temperature sensor using a 7-segment LED</p>
<p><img alt="2014-08-29-14.53.39-e1409555341163" class="alignnone size-full wp-image-532" height="394" src="http://ift.tt/1qAdcwZ" width="700" /></p>
<p>Final installation of temperature sensor and optical sensor</p>
<p>After installing the temperature sensor and the light sensor, the setup looks more complete. In the next article, we will be installing another sensor, and then we will be having a look at the case that will house the Arduino.</p>
<div id="huge-it-share-buttons-top" class="huge-it-share-buttons nobackground">
<h3>Share This:</h3>
<ul class="huge-it-share-buttons-list">
<li class=" nobackground"><a href="http://ift.tt/1LIxY7s" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1LIxY7s','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -0px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="https://twitter.com/share?status=http://yoursmart.mobi/feed&text=Make%20a%20Stevenson%20Screen%20with%20Arduino%20Part%201" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('https://twitter.com/share?status=http://yoursmart.mobi/feed&text=Make a Stevenson Screen with Arduino Part 1','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -30px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://ift.tt/1UDKV5D%20a%20Stevenson%20Screen%20with%20Arduino%20Part%201" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1UDKV5D a Stevenson Screen with Arduino Part 1','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -60px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://ift.tt/1LIxZZ0" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1LIxZZ0','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -90px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://ift.tt/1GBo41g%20a%20Stevenson%20Screen%20with%20Arduino%20Part%201&mini=true&url=http://ift.tt/1LIxZZ4" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1GBo41g a Stevenson Screen with Arduino Part 1&mini=true&url=http://ift.tt/1LIxZZ4','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -120px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://ift.tt/1UDKV5H%20a%20Stevenson%20Screen%20with%20Arduino%20Part%201" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1UDKV5H a Stevenson Screen with Arduino Part 1','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -150px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://ift.tt/1RKRob1%20a%20Stevenson%20Screen%20with%20Arduino%20Part%201" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1RKRob1 a Stevenson Screen with Arduino Part 1','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -180px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://ift.tt/1UDKV5L%20a%20Stevenson%20Screen%20with%20Arduino%20Part%201" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1UDKV5L a Stevenson Screen with Arduino Part 1','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -210px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://ift.tt/1LIxY7u" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1LIxY7u','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -240px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1UDKUyI%20a%20Stevenson%20Screen%20with%20Arduino%20Part%201" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1UDKUyI a Stevenson Screen with Arduino Part 1','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -270px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1RKRm2Y%20a%20Stevenson%20Screen%20with%20Arduino%20Part%201" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1RKRm2Y a Stevenson Screen with Arduino Part 1','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -300px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1o7SuTq" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1o7SuTq','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -330px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1RKRob7%20a%20Stevenson%20Screen%20with%20Arduino%20Part%201" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1RKRob7 a Stevenson Screen with Arduino Part 1','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -360px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1o7SuTs" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1o7SuTs','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -390px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1RKRm34%20a%20Stevenson%20Screen%20with%20Arduino%20Part%201" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1RKRm34 a Stevenson Screen with Arduino Part 1','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -420px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1UDKUyM%20a%20Stevenson%20Screen%20with%20Arduino%20Part%201&pic=&ralateUid=&" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1UDKUyM a Stevenson Screen with Arduino Part 1&pic=&ralateUid=&','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -450px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1RKRmji%20a%20Stevenson%20Screen%20with%20Arduino%20Part%201" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1RKRmji a Stevenson Screen with Arduino Part 1','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -480px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1UDKV5N%20a%20Stevenson%20Screen%20with%20Arduino%20Part%201" id="backforunical539" name="backforunical539" onclick="javascript:void window.open('http://ift.tt/1UDKV5N a Stevenson Screen with Arduino Part 1','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -510px -120px" target="_blank"></a></li>
</ul>
<div class="clear"></div>
</div>
View more at: <a href="http://yoursmart.mobi/">http://yoursmart.mobi</a>

Make a Stevenson Screen with Arduino Part 1

The last time, we used the Arduino as a Web server . In the next few entries, we will aim to expand the Web server by building a Stevenson ...

Make a Stevenson Screen with Arduino Part 1

Wall's Corners

Link Author

Title: Make a Stevenson Screen with Arduino Part 1
Author: Wall's Corners
Rating 5 of 5 Des:

The last time, we used the Arduino as a Web server . In the next few entries, we will aim to expand the Web server by building a Stevenson ...

Make a Stevenson Screen with Arduino Part 1

The last time, we used the Arduino as a Web server . In the next few entries, we will aim to expand the Web server by building a Stevenson ...

Making an LED Light up with Raspberry Pi Before Making It Blink

Wall's Corners

Link Author

Title: Making an LED Light up with Raspberry Pi Before Making It Blink
Author: Wall's Corners
Rating 5 of 5 Des:

Finally, I will try my hand at electronic kits using components! (The above picture shows me playing around with LEDs and three types of res...

<p>Finally, I will try my hand at electronic kits using components! (The above picture shows me playing around with LEDs and three types of resistor.)<br />
I just know that some works with Raspberry Pi involve the use of <a href="http://ift.tt/1WLPAjr" itemprop="url" target="_bank" title="GPIO"><strong>GPIO</strong></a>. And that’s it! I’m starting from a point where I don’t even know the name of the components.<br />
As I’m still beginning to learn about electronics kits, I want to try making a blinking <a href="http://ift.tt/1Rq2vDU" itemprop="url" target="_bank" title="LED"><strong>LED</strong></a>. But before getting it to blink, I’d first like to make the <a href="http://ift.tt/1LK8gQ0" itemprop="url" target="_bank" title="LED"><strong>LED</strong></a> <a href="http://ift.tt/1SDfTEN" itemprop="url" target="_bank" title="light"><strong>light</strong></a> up!</p>
<h2>What is GPIO?</h2>
<blockquote>
<p><em><a href="http://ift.tt/1maQBFn" target="_blank">GPIO – Wikipedia</a></em><br />
<em>GPIO stands for <a href="http://ift.tt/1SkDFrL" itemprop="url" target="_bank" title="General"><strong>General</strong></a> Purpose Input/Output.</em><br />
<em>When used for input, it reads digital signals from other parts of the electric circuit, and when used for output, it can control other devices or give notifications of signals.</em></p>
<p><em><a href="http://ift.tt/1WzahkK" target="_blank">GPIO – TechTerms</a></em><br />
<em>GPIO is a type of pin found on an integrated circuit that does not have a specific function. While most pins have a dedicated purpose, such as sending a signal to a certain component, the function of a GPIO pin is customizable and can be controlled by software.</em></p>
</blockquote>
<p>I mentioned briefly about GPIO in a <a href="http://ift.tt/1SkDI6P" target="_blank">previous article</a>, but I still don’t really understand what is it. Since it “can be used for various purposes depending on its settings,” it would seem that it should work well for working on some hobby projects.<br />
I will figure out the details as I will actually work on it!</p>
<h2>Introducing the Components for This Project</h2>
<p>When I started this project, I didn’t even know the names of these components. I looked up each one by checking them with pictures from books and websites.<br />
Now, let me introduce the parts used for this project!</p>
<p><img alt="Raspberry Pi Breadboard" class="alignnone size-full wp-image-775" height="417" src="http://ift.tt/1Wzakga" width="700" /></p>
<p>Picture 1</p>
<p><strong>Breadboard</strong></p>
<blockquote>
<p><em><a href="http://ift.tt/1eZ1L8Q" target="_blank">Breadboard – Wikipedia</a></em><br />
<em>A breadboard is a board (base) used for experiments and prototyping of electronic circuits. It’s used in prototyping, experiments, evaluations, and similar purposes.</em></p>
</blockquote>
<p>The term breadboard refers to a part consisting of several holes where other parts can be plugged in to allow for wiring that carries an electronic signal without the need for soldering. Since it’s possible to try many different configurations, it’s great for beginners!</p>
<p><img alt="Breadboard" class="alignnone size-full wp-image-776" height="276" src="http://ift.tt/1WzajsR" width="440" /></p>
<p>Figure 1</p>
<p>As in Figure 1, the horizontal lines X and Y, and each of the vertical lines from A-E and from F-J, are connected internally. Let’s make sure to do the wiring properly so that the circuit is routed correctly.</p>
<p><strong>Jumper wire</strong></p>
<p><img alt="Jumper wire male port female port" class="alignnone size-full wp-image-818" height="474" src="http://ift.tt/1SkDFrR" width="700" /></p>
<p>Picture 2</p>
<p>These are the cords for the breadboard. Male ports are like those on the blue cord, with metal exposed at the end, and female ports have a square opening at the end like on the green cord. When plugging them into the breadboard, we use the male ports, and when plugging them into the GPIO on the Raspberry Pi, we use the female ports.<br />
The U-shaped parts at the bottom of the picture were made by cutting jumper wire made from hard materials down to the size of the holes in the breadboard. Using these for the breadboard wiring will make things much more tidier.</p>
<p><strong>Resistors</strong></p>
<p><img alt="Resistor" class="alignnone size-full wp-image-777" height="525" src="http://ift.tt/1Wzakgc" width="700" /></p>
<p>Picture 3</p>
<blockquote>
<p><em><a href="http://ift.tt/1eywtZg" target="_blank">Resistor – Wikipedia</a></em><br />
<em>Resistors are passive elements; they are electronic components used to gain a certain value of electrical resistance.</em></p>
</blockquote>
<p>Resistors are components that serve to adjust the amount of electric current. They are bent into shape before use, as shown on the right side of the picture above.<br />
The strength of resistance is measured in ohms, which use the symbol Ω. Hey, I remember learning about Ohm’s law in junior high school! However, we won’t be using that law right now.</p>
<p><a href="http://ift.tt/1ekXJuv" target="_blank">Resistor color code – Wikipedia</a><br />
<a href="http://ift.tt/1SkDI6X" target="_blank">Resistor color code quick guide</a></p>
<p>Resistance values are determined by the color of the bands printed on the resistor. The colors of the resistor in the picture from left to right are as follows: “red, red, brown, gold” for 220Ω, “brown, black, red, gold” for 1kΩ, and “brown, black, orange, gold” for 10kΩ. Of course, with all those similar colors, it can be pretty hard to tell them apart.</p>
<p><strong>LED</strong></p>
<p><img alt="LED" class="alignnone size-full wp-image-778" height="525" src="http://ift.tt/1WzajsT" width="700" /></p>
<p>Picture 4</p>
<p><a href="http://ift.tt/1pL1mJr" target="_blank">LED (Light Emitting Diode) – Wikipedia</a></p>
<p>Here is the key element of this project, the LED!<br />
Unlike the resistors, this part has a distinction between positive and negative. Of the two wires like legs, the shorter one is negative. As small as these parts are, it can be hard to tell, but if you look closely from above, you can see that the negative side is shorter.</p>
<h2>The Raspberry Pi’s GPIO Terminal</h2>
<p>The GPIO terminal on the Raspberry Pi has 40 pins, but how to know which pin is used for what?<br />
Figure 2 shows the circuit diagram taken from the <a href="http://ift.tt/1swYwhI" target="_blank">official Model B+ product page</a>.</p>
<p><img alt="GPIO" class="alignnone size-full wp-image-779" height="396" src="http://ift.tt/1SkDFIb" width="700" /></p>
<p>Figure 2</p>
<p>The numbers are allocated from 1 to 40, and the red lettering on the circuit diagram shows the names of the pins.<br />
Up to number 26, the Model A and Model B are the same.</p>
<p><img alt="Pin number" class="alignnone size-full wp-image-780" height="307" src="http://ift.tt/1Wzakgi" width="700" /></p>
<p>Figure 3</p>
<p>The pin layout for the Model A and Model B are described in the <a href="http://ift.tt/RG2VNQ" target="_blank">GPIO documentation on the official site</a>. They are color coded and easy to understand.</p>
<p>The GPIO on the Model B+ has 26 pins available to be used, from 2 to 27. The pins are not necessarily arranged in order, so it’s important to check carefully when using them.<br />
Numbers 1 and 17 are the 3.3V power supplies, and numbers 2 and 4 are the 5V power supplies. We can use these when we just want to get power only, without any kind of control.<br />
As described in the notes on the right side of Figure 2, pins 27 (ID_SD) and 28 (ID_SC) cannot be used.<br />
The eight pins numbers that are  omitted (6, 9, 14, 20, 25, 30, 34, and 39) are called GND.</p>
<blockquote>
<p><em><a href="http://ift.tt/1Gee8Iz" target="_blank">GND (ground) – Wikipedia</a></em><br />
<em>Ground refers to connecting the device casing, the neutral point of the electric line, potential line of the electronic device, etc. To the reference point, or to the reference point itself.</em><br />
<em>It can also be called “earth.”</em></p>
</blockquote>
<p>I think “ground” is easy to understand! It’s the cord attached to consumer electronics that allows electricity to escape. When wiring, we connect it to the negative side. It’s something like a place where electricity can flow away and disappear.</p>
<p>Incidentally, if we want to check the alignment of the actual device with the circuit diagram, it should be aligned vertically with the microSD card slot at the top.</p>
<p><img alt="Raspberry Pi GPIO Pin 1" class="alignnone size-full wp-image-819" height="467" src="http://ift.tt/1S3jsb5" width="700" /></p>
<p>Picture 5</p>
<p>There is also an indicator on the back side. If you look at the back of the board, the pin 1 is soldered in a square shape.</p>
<h2>Wiring</h2>
<p>Now, let’s try to do some actual wiring! We will plug in the various components into the breadboard, and the finished product should look something like this.</p>
<p><img alt="Raspberry Pi breadboard wiring" class="alignnone size-full wp-image-781" height="396" src="http://ift.tt/1XD459s" width="517" /></p>
<p>Figure 4</p>
<p>Let’s begin by preparing the breadboard. We will place the LED and resistor on the board.<br />
I put the resistor in holes 1 to 4 on the H row, and had the LED follow that, going in holes 4 and 5 on the F row. The resistor has no polarity, so it can be facing either direction. The LED is placed so that the positive side is connected to the resistor.<br />
Parts can be placed in any row from F to J, but the horizontal positions should be arranged so that they connect to the next part.</p>
<p>Next, we will prepare the jumper wires to connect with the Raspberry Pi. The green cord going to hole J-1 is the positive side that connects to the power supply. The yellow cord going to hole J-5 is the negative side that connects to GND (ground).</p>
<p><img alt="Breadboard resistor led" class="alignnone size-full wp-image-782" height="506" src="http://ift.tt/1S3jpMs" width="700" /></p>
<p>Picture 6</p>
<p>This is how my actual board turned out!</p>
<p>The breadboard is now ready, so let’s connect it to the Raspberry Pi!<br />
We connect the negative side jumper wire to GND. This can be connected to any of the eight GND pins (6, 9, 14, 20, 25, 30, 34 or 39). We should connect it to GND first, before connecting to the power supply.<br />
This time, we only want to <a href="http://ift.tt/1SDfTER" itemprop="url" target="_bank" title="Create your own musical light show with Raspberry Pi"><strong>light</strong></a> up the LED, so we will directly connect the positive side to the power supply. If the electric current is too strong, it could possibly damage the LED, so I am using the 3.3V power supply on pin 1.</p>
<p>Once we connect the jumper wire, the current flows through…</p>
<p><img alt="Breadboard resistor led light up" class="alignnone wp-image-783 size-full" height="525" src="http://ift.tt/1S3jpMu" width="700" /></p>
<p>Picture 7</p>
<p>The LED lights up without any problems!<br />
It lit up as soon as I touched the jumper wire to the GPIO, so we must be careful not to touch it to the wrong place by mistake.</p>
<h2>Let’s Make it Blink!</h2>
<p>Next, let’s try controlling the LED from the Raspberry Pi side!<br />
We will leave the breadboard as it is, and move the positive side wire on the GPIO from the 3.3V power supply on pin 1 to the GPIO2 pin one spot over on pin 3.<br />
Wait a minute?! It’s still shining for some reasons. It appears that this pin allows current to pass normally by default.</p>
<p>So let’s enter some commands!<br />
First, we will need to prepare the GPIO port for use.</p>
<div>
<div id="highlighter_545640" class="syntaxhighlighter cpp">
<table border="0" cellspacing="0" cellpadding="0">
<caption>Code-Example</caption>
<tbody>
<tr>
<td class="gutter">
<div class="line number1 index0 alt2">1</div>
</td>
<td class="code">
<div class="container">
<div class="line number1 index0 alt2"><code class="cpp plain">echo 2 > /sys/</code><code class="cpp keyword bold">class</code><code class="cpp plain">/gpio/export</code></div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<p>The “echo” command is a command that writes to a file. The syntax is “(value to be written) > (filename).” Since we will be using GPIO2 this time, I specify the value “2.”<br />
Incidentally, I was able to visually confirm the virtual files on the Raspberry Pi. If you actually browse to “/sys/class/gpio” in the file explorer, you can see that there is a virtual folder named “gpio2.”</p>
<p><img alt="Raspberry Pi GPIO" class="alignnone size-full wp-image-790" height="518" src="http://ift.tt/1XD459w" width="600" /></p>
<p>Figure 5</p>
<p>And, if we look inside the gpio2 folder…</p>
<p><img alt="Raspberry Pi GPIO2" class="alignnone size-full wp-image-791" height="518" src="http://ift.tt/1S3jpMw" width="600" /></p>
<p>Figure 6</p>
<p>… it looks like this. We can control the GPIO by writing to these files. It’s easy to grasp when we can see it like this with our own eyes!<br />
Next, we will designate whether “gpio2” is to perform input or output. The input/output setting is done in the “direction” file.</p>
<div>
<div id="highlighter_501113" class="syntaxhighlighter cpp">
<table border="0" cellspacing="0" cellpadding="0">
<caption>Code-Example</caption>
<tbody>
<tr>
<td class="gutter">
<div class="line number1 index0 alt2">1</div>
</td>
<td class="code">
<div class="container">
<div class="line number1 index0 alt2"><code class="cpp plain">echo out > /sys/</code><code class="cpp keyword bold">class</code><code class="cpp plain">/gpio/gpio2/direction</code></div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<p>This time, we are transmitting a signal, which is output, so we will use the “out” setting.<br />
(When I entered the command, the LED went out! It appears that it switched over to allow individual control.)</p>
<p>The output value settings are done in the “value” file.</p>
<div>
<div id="highlighter_860379" class="syntaxhighlighter cpp">
<table border="0" cellspacing="0" cellpadding="0">
<caption>Code-Example</caption>
<tbody>
<tr>
<td class="gutter">
<div class="line number1 index0 alt2">1</div>
<div class="line number2 index1 alt1">2</div>
</td>
<td class="code">
<div class="container">
<div class="line number1 index0 alt2"><code class="cpp plain">echo 1 > /sys/</code><code class="cpp keyword bold">class</code><code class="cpp plain">/gpio/gpio2/value</code></div>
<div class="line number2 index1 alt1"><code class="cpp plain">echo 0 > /sys/</code><code class="cpp keyword bold">class</code><code class="cpp plain">/gpio/gpio2/value</code></div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<p>If we set the value to “1,” current will flow and the LED will light up. We can turn off the LED by using a value of “0” to cut off the current. You can confirm that the value has been rewritten by opening the “value” file in a text editor.</p>
<div>
<div id="highlighter_586959" class="syntaxhighlighter cpp">
<table border="0" cellspacing="0" cellpadding="0">
<caption>Code-Example</caption>
<tbody>
<tr>
<td class="gutter">
<div class="line number1 index0 alt2">1</div>
</td>
<td class="code">
<div class="container">
<div class="line number1 index0 alt2"><code class="cpp plain">echo 2 > /sys/</code><code class="cpp keyword bold">class</code><code class="cpp plain">/gpio/unexport</code></div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<p>When finished, use this command to stop using the GPIO. The opposite of the “export” command is “unexport.” When we execute this command, the gpio2 folder will get deleted.</p>
<p><img alt="Raspberry Pi LXTerminal" class="alignnone size-full wp-image-814" height="201" src="http://ift.tt/1XD459y" width="541" /></p>
<p>Figure 7</p>
<p>Everything up to this point is the full sequence. We have successfully controlled the LED from the Raspberry Pi!<br />
It’s a simple and easy to follow process that only involves rewriting the contents of four files: “export,” “direction,” “value,” and “unexport.” The virtual files could be directly viewed, so I was able to check the control mechanisms as I went along.</p>
<h2>Summary</h2>
<p>I managed to make the LED light up, and my first electronic kits project was a success!<br />
Wiring the breadboard was like doing a puzzle, so I had fun playing around with it. It was also interesting to see the results of my commands take place physically in the real world in the form of a shining LED! I am now even more interested in electronic kits!</p>
<p>For my next article (#10), I will finally get around to making that LED blink!<br />
To make an LED blink, will I have to… Use a program? What kind of language and tools will I need to use? Follow me as I continue to learn and move step by step through this project!</p>
<div id="huge-it-share-buttons-top" class="huge-it-share-buttons nobackground">
<h3>Share This:</h3>
<ul class="huge-it-share-buttons-list">
<li class=" nobackground"><a href="http://ift.tt/1LIxY7s" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1LIxY7s','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -0px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="https://twitter.com/share?status=http://yoursmart.mobi/feed&text=Making%20an%20LED%20Light%20up%20with%20Raspberry%20Pi%20Before%20Making%20It%20Blink" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('https://twitter.com/share?status=http://yoursmart.mobi/feed&text=Making an LED Light up with Raspberry Pi Before Making It Blink','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -30px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://ift.tt/1M21K7n%20an%20LED%20Light%20up%20with%20Raspberry%20Pi%20Before%20Making%20It%20Blink" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1M21K7n an LED Light up with Raspberry Pi Before Making It Blink','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -60px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://ift.tt/1LIxZZ0" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1LIxZZ0','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -90px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://ift.tt/1Y1qP2Z%20an%20LED%20Light%20up%20with%20Raspberry%20Pi%20Before%20Making%20It%20Blink&mini=true&url=http://ift.tt/1LIxZZ4" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1Y1qP2Z an LED Light up with Raspberry Pi Before Making It Blink&mini=true&url=http://ift.tt/1LIxZZ4','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -120px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://ift.tt/1M21K7p%20an%20LED%20Light%20up%20with%20Raspberry%20Pi%20Before%20Making%20It%20Blink" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1M21K7p an LED Light up with Raspberry Pi Before Making It Blink','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -150px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://ift.tt/1Y1qP31%20an%20LED%20Light%20up%20with%20Raspberry%20Pi%20Before%20Making%20It%20Blink" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1Y1qP31 an LED Light up with Raspberry Pi Before Making It Blink','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -180px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://ift.tt/1M21LIn%20an%20LED%20Light%20up%20with%20Raspberry%20Pi%20Before%20Making%20It%20Blink" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1M21LIn an LED Light up with Raspberry Pi Before Making It Blink','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -210px -120px" target="_blank"></a></li>
<li class=" nobackground"><a href="http://ift.tt/1LIxY7u" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1LIxY7u','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -240px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1M21K7t%20an%20LED%20Light%20up%20with%20Raspberry%20Pi%20Before%20Making%20It%20Blink" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1M21K7t an LED Light up with Raspberry Pi Before Making It Blink','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -270px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1ZMi0eX%20an%20LED%20Light%20up%20with%20Raspberry%20Pi%20Before%20Making%20It%20Blink" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1ZMi0eX an LED Light up with Raspberry Pi Before Making It Blink','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -300px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1o7SuTq" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1o7SuTq','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -330px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1M21LIr%20an%20LED%20Light%20up%20with%20Raspberry%20Pi%20Before%20Making%20It%20Blink" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1M21LIr an LED Light up with Raspberry Pi Before Making It Blink','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -360px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1o7SuTs" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1o7SuTs','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -390px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1ZMi0eZ%20an%20LED%20Light%20up%20with%20Raspberry%20Pi%20Before%20Making%20It%20Blink" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1ZMi0eZ an LED Light up with Raspberry Pi Before Making It Blink','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -420px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1M21KnH%20an%20LED%20Light%20up%20with%20Raspberry%20Pi%20Before%20Making%20It%20Blink&pic=&ralateUid=&" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1M21KnH an LED Light up with Raspberry Pi Before Making It Blink&pic=&ralateUid=&','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -450px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1ZMhYUf%20an%20LED%20Light%20up%20with%20Raspberry%20Pi%20Before%20Making%20It%20Blink" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1ZMhYUf an LED Light up with Raspberry Pi Before Making It Blink','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -480px -120px" target="_blank"></a></li>
<li class="none nobackground"><a href="http://ift.tt/1M21LIy%20an%20LED%20Light%20up%20with%20Raspberry%20Pi%20Before%20Making%20It%20Blink" id="backforunical526" name="backforunical526" onclick="javascript:void window.open('http://ift.tt/1M21LIy an LED Light up with Raspberry Pi Before Making It Blink','1410949501326','width=700,height=500,toolbar=0,menubar=0,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0');return false;" style="background-position: -510px -120px" target="_blank"></a></li>
</ul>
<div class="clear"></div>
</div>
View more at: <a href="http://yoursmart.mobi/">http://yoursmart.mobi</a>

Making an LED Light up with Raspberry Pi Before Making It Blink

Finally, I will try my hand at electronic kits using components! (The above picture shows me playing around with LEDs and three types of res...

Two more LEDs – tutorial simple part 2

Two more LEDs – tutorial simple part 2

Make a Stevenson Screen with Arduino Part 1

Make a Stevenson Screen with Arduino Part 1

Making an LED Light up with Raspberry Pi Before Making It Blink

Contact Form