A single LED – tutorial simple part 1

<p>Before we even get started with the GPIO, lets make an LED <a href="http://bit.ly/1VNpzU4" itemprop="url" target="_bank" title="light"><strong>light</strong></a> up by simply wiring it to the +3.3v supply and 0v.</p> <div id="attachment_378" class="wp-caption aligncenter"> <p><a href="http://bit.ly/1Q3iXit" target="_blank"><img alt="Single LED" class="size-medium wp-image-378" height="225" sizes="(max-width: 300px) 100vw, 300px" src="http://bit.ly/1Pt4JBS" srcset="http://bit.ly/1Pt4JBS 300x, http://bit.ly/1Q3icG4 400x, http://bit.ly/1Q3iXit 1024x" title="Single LED" width="300" /></a></p> <p class="wp-caption-text">Single LED Lit up</p> </div> <div id="attachment_919" class="wp-caption aligncenter"> <p><a href="http://bit.ly/1Pt4oz2" target="_blank"><img alt="One LED on the 3.3v supply" class="size-medium wp-image-919" height="300" sizes="(max-width: 267px) 100vw, 267px" src="http://bit.ly/1Q3i5u3" srcset="http://bit.ly/1Q3i5u3 267x, http://bit.ly/1Pt4dnt 911x, http://bit.ly/1Pt4oz2 948x" title="One LED on the 3.3v supply" width="267" /></a></p> <p class="wp-caption-text">One LED on the 3.3v supply</p> </div> <p> </p> <p>So… We have a yellow wire from the Pi’s +3.3v supply to the breadboard and this connects to an LED then via a 270Ω (ohm) resistor to 0v. The green wire connects back to the Pi.</p> <p>(Note that here and in the following pages, the <em>Fritzing</em> breadboard layout is slightly different from the photos – it’s the same circuit, just laid out in a way that makes it easy to see in the images)</p> <p>Refer to the <a href="http://bit.ly/1Q3iFYS" target="_blank" title="Pins">diagram here</a> to work out the pins we’re using. From this view the 3.3v pin on the GPIO connector is to the top-left, or pin number 1 on the connector.</p> <p>In electronics terms, our circuit diagram looks like this:</p> <div id="attachment_412" class="wp-caption aligncenter"> <p><a href="http://bit.ly/1Pt5BGs" target="_blank"><img alt="LED Circuit diagram" class="size-medium wp-image-412" height="300" src="http://bit.ly/1Q3iGfo" title="LED Circuit diagram" width="205" /></a></p> <p class="wp-caption-text">LED Circuit diagram</p> </div> <p>A quick word about the electronics involved. LEDs are <a href="http://bit.ly/1Pt3Au6" itemprop="url" target="_bank" title="Light"><strong>Light</strong></a> Emitting Diodes and the diode part is important for us – they only pass electricity one way, so we need to make sure we put them in the right way round. They have a long leg and a slightly shorter leg. The long leg goes to the plus side and the shorter leg to the negative (or 0v) side. If we’re cut the legs short (as I have done here), then another way is to look at the side of the LED – there will be a flat section. Think of the flat as a minus sign and connect that to the 0v side of the circuit.</p> <p>If we allow too much current through the LED, it will burn very bright for a very short period of time before it burns out, so we need a resistor to limit the current. Calculating the resistor value is not difficult but for now, just use anything from 270Ω to 330Ω. Anything higher will make the LED dimmer.</p> <p>So now we have a lit LED. What we really need to do is make it easily turn on and offable – preferably by a command or program running on the <a href="http://bit.ly/26nCm2K" itemprop="url" target="_bank" title="Raspberry"><strong>Raspberry</strong></a> Pi.</p> <p>We need to move the yellow wire to one of the programmable GPIO pins. We’ll move it to <em><strong>wiringPi</strong></em> pin 0 (GPIO-17) which is notionally the first user GPIO pin. (It’s physical location is pin 11 on the GPIO connector)</p> <div id="attachment_380" class="wp-caption aligncenter"> <p><a href="http://bit.ly/1Pt3C57" target="_blank"><img alt="LED controlled by GPIO" class="size-medium wp-image-380" height="225" sizes="(max-width: 300px) 100vw, 300px" src="http://bit.ly/1Q3hM2y" srcset="http://bit.ly/1Q3hM2y 300x, http://bit.ly/1Pt3MJM 400x, http://bit.ly/1Pt3C57 1024x" title="LED controlled by GPIO" width="300" /></a></p> <p class="wp-caption-text">LED controlled by GPIO</p> </div> <div id="attachment_846" class="wp-caption aligncenter"> <p><a href="http://bit.ly/1Q3iHQB" target="_blank"><img alt="" class="size-medium wp-image-846" height="300" src="http://bit.ly/1Pt4Ptf" title="Breadboard layout for GPIO controlled LED" width="267" /></a></p> <p class="wp-caption-text">Breadboard layout for GPIO controlled LED</p> </div> <p>Do check against the wiring diagram to work out which pin on the connector to use. The LED will initially be off because normally the GPIO pins are initialised as inputs at power-on time.</p> <p>If you haven’t already done so, <a href="http://bit.ly/1Q3iGMx" target="_blank" title="Download and Install">download and install wiringPi</a>. This will give you some libraries to use in C programs, but also a command-line program which we can use to test the GPIO with.</p> <p>Type the commands:</p> <pre> gpio mode 0 out gpio write 0 1 gpio write 0 0 </pre> <p>If all has gone well, the LED should come on, then go off again. The first <em><strong>gpio</strong></em> command above sets pin 0 to output mode, the 2nd sets pin 0 to the value “1” – logic 1 which puts a 3.3v signal on the pin, and turns the LED on, and the last one turns it off again.</p> <h4>A word about GPIO pin numberings…</h4> <p>t’s often customary to refer to the GPIO pins on a microcontroller by the pin number on the chip originating the signal (or by the internal register name and bit-number). The <a href="http://bit.ly/26nCm2w" itemprop="url" target="_bank" title="Arduino"><strong>Arduino</strong></a> system decided that that was complex for newcomers and used a system called <strong><em>wiring</em></strong> which started the pin numbers at zero and worked upwards. This had the advantage of making sure that when they moved to new chips which possibly had different internal configurations, etc. the pin numbers would remain the same. I have adopted this scheme in my <em><strong>wiringPi</strong></em> library for the <a href="http://bit.ly/1T5ac2c" itemprop="url" target="_bank" title="Raspberry"><strong>Raspberry</strong></a> Pi, but I also allow for the native GPIO numbering scheme too. You will probably see the GPIO numbering scheme elsewhere though, so I’ll give examples using both schemes.</p> <p>If you look at the <a href="http://bit.ly/1Q3iFYS" target="_blank" title="Pins">pins chart</a>, then it gives both values. You can see that <em><strong>wiringPi</strong></em> pin 0 is GPIO-17. <em><strong>wiringPi</strong></em> pin 1 is GPIO-18, <em><strong>wiringPi</strong></em> pin 2 is GPIO-21 an so on. To use the GPIO pin numbering then you need to pass the -g flag to the <strong><em>gpio</em></strong> program:</p> <pre> gpio -g write 17 1 gpio -g write 17 0 </pre> <p>This should turn the LED on then off again.</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="backforunical792" name="backforunical792" 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=A%20single%20LED%20%E2%80%93%20tutorial%20simple%20part%201" id="backforunical792" name="backforunical792" onclick="javascript:void 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A single LED – tutorial simple part 1

Before we even get started with the GPIO, lets make an LED light up by simply wiring it to the +3.3v supply and 0v. Single LED Lit up ...

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Creature Capture | Stopping Raspivid After a Non-Predetermined Time

<p>One of the biggest problems with the built in commands for using the <a href="http://ift.tt/1zF9dCP" target="_blank">Raspberry Pi Camera module </a>is that you can’t stop a recording after an unknown time. You can record for a given number of seconds and that’s it. I have attempted to solve this problem by backgrounding the initial record process with a time of 27777.8 hours (99999999 seconds) when it’s time to stop recording, the process is manually killed using pkill.</p> <p>Here is a test of my code, which I’ve called CameraModulePlus (written in python) which takes two videos, one for five seconds, and one for ten seconds, with a 10 second delay in between.</p> <div id="crayon-57073a727194f634971728" class="crayon-syntax crayon-theme-orange-code crayon-font-courier-new crayon-os-mac print-yes notranslate" data-settings=" minimize scroll-mouseover"> <div class="crayon-toolbar" data-settings=" show"> <div class="crayon-tools"> <div class="crayon-button crayon-nums-button crayon-pressed" title="Toggle Line Numbers"></div> <div class="crayon-button crayon-plain-button" title="Toggle Plain Code"></div> <div class="crayon-button crayon-wrap-button" title="Toggle Line Wrap"></div> <div class="crayon-button crayon-copy-button" title="Copy"></div> <div class="crayon-button crayon-popup-button" title="Open Code In New Window"></div> <p><span class="crayon-language">Python</span></p> </div> </div> <div class="crayon-plain-wrap"></div> <div class="crayon-main"> <table class="crayon-table"> <tbody> <tr class="crayon-row"> <td class="crayon-nums" data-settings="show"> <div class="crayon-nums-content"> <div class="crayon-num" data-line="crayon-57073a727194f634971728-1">1</div> <div class="crayon-num crayon-striped-num" data-line="crayon-57073a727194f634971728-2">2</div> <div class="crayon-num" data-line="crayon-57073a727194f634971728-3">3</div> <div class="crayon-num crayon-striped-num" data-line="crayon-57073a727194f634971728-4">4</div> <div class="crayon-num" data-line="crayon-57073a727194f634971728-5">5</div> <div class="crayon-num crayon-striped-num" data-line="crayon-57073a727194f634971728-6">6</div> <div class="crayon-num" data-line="crayon-57073a727194f634971728-7">7</div> <div class="crayon-num crayon-striped-num" data-line="crayon-57073a727194f634971728-8">8</div> <div class="crayon-num" data-line="crayon-57073a727194f634971728-9">9</div> <div class="crayon-num crayon-striped-num" data-line="crayon-57073a727194f634971728-10">10</div> <div class="crayon-num" data-line="crayon-57073a727194f634971728-11">11</div> <div class="crayon-num crayon-striped-num" data-line="crayon-57073a727194f634971728-12">12</div> <div class="crayon-num" data-line="crayon-57073a727194f634971728-13">13</div> <div class="crayon-num crayon-striped-num" data-line="crayon-57073a727194f634971728-14">14</div> <div class="crayon-num" data-line="crayon-57073a727194f634971728-15">15</div> <div class="crayon-num crayon-striped-num" data-line="crayon-57073a727194f634971728-16">16</div> <div class="crayon-num" data-line="crayon-57073a727194f634971728-17">17</div> <div class="crayon-num crayon-striped-num" data-line="crayon-57073a727194f634971728-18">18</div> <div class="crayon-num" data-line="crayon-57073a727194f634971728-19">19</div> <div class="crayon-num crayon-striped-num" data-line="crayon-57073a727194f634971728-20">20</div> <div class="crayon-num" data-line="crayon-57073a727194f634971728-21">21</div> </div> </td> <td class="crayon-code"> <div class="crayon-pre"> <div id="crayon-57073a727194f634971728-1" class="crayon-line"><span class="crayon-st">from</span> <span class="crayon-e">CameraModulePlus</span> <span class="crayon-r">import</span> <span class="crayon-e">CameraModuleVideo</span></div> <div id="crayon-57073a727194f634971728-2" class="crayon-line crayon-striped-line"><span class="crayon-r">import</span> <span class="crayon-k">subprocess</span></div> <div id="crayon-57073a727194f634971728-3" class="crayon-line"><span class="crayon-st">from</span> <span class="crayon-k">time</span> <span class="crayon-r">import</span> <span class="crayon-e">sleep</span></div> <div id="crayon-57073a727194f634971728-4" class="crayon-line crayon-striped-line"><span class="crayon-r">import</span> <span class="crayon-k">time</span></div> <div id="crayon-57073a727194f634971728-5" class="crayon-line"></div> <div id="crayon-57073a727194f634971728-6" class="crayon-line crayon-striped-line"><span class="crayon-v">v1</span> <span class="crayon-o">=</span> <span class="crayon-e">CameraModuleVideo</span><span class="crayon-sy">(</span><span class="crayon-s">“/home/pi/CreatureCapture/”</span><span class="crayon-sy">,</span> <span class="crayon-s">“video1”</span><span class="crayon-sy">)</span></div> <div id="crayon-57073a727194f634971728-7" class="crayon-line"><span class="crayon-v">v2</span> <span class="crayon-o">=</span> <span class="crayon-e">CameraModuleVideo</span><span class="crayon-sy">(</span><span class="crayon-s">“/home/pi/CreatureCapture/”</span><span class="crayon-sy">,</span> <span class="crayon-s">“video2”</span><span class="crayon-sy">)</span></div> <div id="crayon-57073a727194f634971728-8" class="crayon-line crayon-striped-line"></div> <div id="crayon-57073a727194f634971728-9" class="crayon-line"><span class="crayon-st">try</span><span class="crayon-o">:</span></div> <div id="crayon-57073a727194f634971728-10" class="crayon-line crayon-striped-line"><span class="crayon-v">v1</span><span class="crayon-sy">.</span><span class="crayon-e">startRecording</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span></div> <div id="crayon-57073a727194f634971728-11" class="crayon-line"><span class="crayon-k">time</span><span class="crayon-sy">.</span><span class="crayon-e">sleep</span><span class="crayon-sy">(</span><span class="crayon-cn">5</span><span class="crayon-sy">)</span></div> <div id="crayon-57073a727194f634971728-12" class="crayon-line crayon-striped-line"><span class="crayon-v">v1</span><span class="crayon-sy">.</span><span class="crayon-e">stopRecording</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span></div> <div id="crayon-57073a727194f634971728-13" class="crayon-line"></div> <div id="crayon-57073a727194f634971728-14" class="crayon-line crayon-striped-line"><span class="crayon-k">time</span><span class="crayon-sy">.</span><span class="crayon-e">sleep</span><span class="crayon-sy">(</span><span class="crayon-cn">10</span><span class="crayon-sy">)</span></div> <div id="crayon-57073a727194f634971728-15" class="crayon-line"></div> <div id="crayon-57073a727194f634971728-16" class="crayon-line crayon-striped-line"><span class="crayon-v">v2</span><span class="crayon-sy">.</span><span class="crayon-e">startRecording</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span></div> <div id="crayon-57073a727194f634971728-17" class="crayon-line"><span class="crayon-k">time</span><span class="crayon-sy">.</span><span class="crayon-e">sleep</span><span class="crayon-sy">(</span><span class="crayon-cn">10</span><span class="crayon-sy">)</span></div> <div id="crayon-57073a727194f634971728-18" class="crayon-line crayon-striped-line"><span class="crayon-v">v2</span><span class="crayon-sy">.</span><span class="crayon-e">stopRecording</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span></div> <div id="crayon-57073a727194f634971728-19" class="crayon-line"></div> <div id="crayon-57073a727194f634971728-20" class="crayon-line crayon-striped-line"><span class="crayon-st">except</span> <span class="crayon-k">ValueError</span> <span class="crayon-st">as</span> <span class="crayon-v">e</span><span class="crayon-o">:</span></div> <div id="crayon-57073a727194f634971728-21" class="crayon-line"><span class="crayon-k">print</span><span class="crayon-sy">(</span><span class="crayon-v">e</span><span class="crayon-sy">)</span></div> </div> </td> </tr> </tbody> </table> </div> </div> <p>Here is a result of the 5 second duration test:</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><iframe width="678" height="381" src="https://www.youtube.com/embed/8MPRylqqxr4?feature=oembed" frameborder="0" allowfullscreen=""></iframe></p> <p> </p> <p>Here is a result of the 10 second duration test:</p> <p><iframe width="678" height="381" src="https://www.youtube.com/embed/N3yThiJD5nw?feature=oembed" frameborder="0" allowfullscreen=""></iframe></p> <p><span style="font-family: 'Source Sans Pro'; font-size: 18px; line-height: 27px;"> </span></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="backforunical464" name="backforunical464" 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Creature Capture | Stopping Raspivid After a Non-Predetermined Time

One of the biggest problems with the built in commands for using the  Raspberry Pi Camera module  is that you can’t stop a recording after a...

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