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How To Overclock Your Raspberry Pi

Wall's Corners

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Title: How To Overclock Your Raspberry Pi
Author: Wall's Corners
Rating 5 of 5 Des:

Overclocking the Raspberry Pi is a very simple process, but as with all overclocking results vary between chips so the only way to find out...

<p>Overclocking the <a class="skimwords-link" data-group-id="17812" data-skim-creative="300006" data-skim-node-id="188:OverclockingtheRaspb_1" data-skim-product="1" data-skimlinks-editor="0" data-skimwords-id="1" data-skimwords-word="raspberry%20pi" href="http://ift.tt/1M4Ffif" target="_blank" title="Shopping Link Added by SkimWords">Raspberry Pi</a> is a very simple process, but as with all overclocking results vary between chips so the only way to find out your own <a href="http://ift.tt/1o7SsLh" itemprop="url" target="_bank" title="Raspberry"><strong>Raspberry</strong></a> Pi’s limits is to experiment.</p>
<p>The makers of the Pi have very conveniently created a file called <em class="bbc"><span class="skimlinks-unlinked">config.txt</span></em> located in the <em class="bbc">/boot</em> directory. In this file you can set all kinds of settings, such as forcing HDMI, resolution, and yes, clock frequencies and voltages. Now, there are two things you can do. One is simply overclocking and leaving the voltages as they are, and the other is to also overvolt (increase the voltage to the chips) which results is more heat generated (shouldn’t be much of an issue), shorter lifespan (in a higher degree than simply overclocking, but if I recall correctly we’re still most likely talking years according to dom, one of the guys in the know) and a guaranteed voiding of warranty. Once you have tried overvolting just once a flag is set and your warranty is void forever. The upside to overvolting is, of course, that you can generally squeeze just a little bit more out of the chips increasing the frequencies, but some have reported not much higher frequencies even with overvolting compared to simply overclocking. It’s up to you if it’s worth voiding the warranty.</p>
<p><strong class="bbc">Overclocking</strong><br />
There are seven different frequencies you can change, here’s a list of them (and their default values in MHz):</p>
<ul class="bbc">
<li>arm_freq = 700 # frequency of the ARM processor</li>
<li>sdram_freq = 400 # frequency of the <a class="skimwords-link" data-group-id="0" data-skim-creative="300003" data-skim-node-id="48:sdram_freq=400#frequ_1" data-skim-product="906294" data-skimlinks-editor="0" data-skimwords-id="906294" data-skimwords-word="sdram" href="http://ift.tt/1qCvugW" target="_blank" title="Shopping Link Added by SkimWords">SDRAM</a> memory</li>
<li>gpu_freq = 250 # sets all the following values related to the GPU (graphics processor):</li>
<li>core_freq = 250 # frequency of the GPU core</li>
<li>h264_freq = 250 # frequency of the hardware video block</li>
<li>isp_freq = 250 # frequency of image sensor pipeline block</li>
<li>v3d_freq = 250 # frequency of 3D block</li>
</ul>
<p>According to dom (in this thread: <a class="bbc_url" href="http://ift.tt/1U3bqAb" rel="nofollow external" target="_blank" title="External link">http://ift.tt/1qCvsps</a>) you will want all the GPU frequencies to be the same or integer multiples. That means if you change core_freq to 400 you will want to change h264_freq, isp_freq and v3d_freq to either 200 or 400 as well.</p>
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<p>To change the frequencies edit (or create if it doesn’t exist) <em class="bbc">/boot/<span class="skimlinks-unlinked">config.txt</span></em> and add one or more of the above lines (without the # comments) and reboot. Your Pi will now run at the new frequency. As I mentioned before results vary between chips but squeezing it up to 800 for arm_freq, 450 for sdram_freq and 300 for gpu_freq seems to be a good starting point that most chips can reach without difficulty. From there you can increase the different values incrementally until you hit your limit (resulting in crashes and kernel panics and general stability issues).</p>
<p><strong class="bbc">Overvolting</strong><br />
Again, overvolting will irreversibly void your warranty. Proceed at your own risk. The two values (maybe exclusively the first) you may want to touch are the following:</p>
<ul class="bbc">
<li>over_voltage = 0 # CPU and GPU voltage, 0 means 1.2V with each positive or negative step representing 0.025V. 1 is 1.2+0.025=1.225V and so on</li>
<li>over_voltage_sdram = 0 # voltage for the <a class="skimwords-link" data-group-id="0" data-skim-creative="300003" data-skim-node-id="324:over_voltage_sdram=0_1" data-skim-product="906294" data-skimlinks-editor="0" data-skimwords-id="906294" data-skimwords-word="sdram" href="http://ift.tt/1qCvugW" target="_blank" title="Shopping Link Added by SkimWords">SDRAM</a>, works just like the previous setting. This, just like gpu_freq, breaks down into three different values, but unless you know what you’re doing I don’t suggest touching this or them. I don’t see much talk about it so I suggest you don’t fiddle with it without further research.</li>
</ul>
<p>It seems to be a generally bad idea to go over 8 on the over_voltage setting, with most people seemingly settling in at 6.</p>
<p>When you’ve found a nice clock that runs stable I think the community would appreciate you adding your values to the table at the bottom of this page to help future overclockers in their endeavour: <a class="bbc_url" href="http://ift.tt/1U3bqAc" rel="nofollow external" target="_blank" title="External link">http://ift.tt/1qCvspu</a></p>
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How To Overclock Your Raspberry Pi

Overclocking the Raspberry Pi is a very simple process, but as with all overclocking results vary between chips so the only way to find out...

Getting Started with the BrickPi

Wall's Corners

Link Author

Title: Getting Started with the BrickPi
Author: Wall's Corners
Rating 5 of 5 Des:

Introduction If you’re familiar with Lego Mindstorms , then you are probably aware of all the cool projects that you can make and the edu...

<div class="section tutorial-page">
<h2 id="introduction">Introduction</h2>
<p>If you’re familiar with <a href="http://ift.tt/nJVD8D" target="_blank">Lego Mindstorms</a>, then you are probably aware of all the cool <a href="http://ift.tt/1qCvqxT" target="_blank">projects</a> that you can make and the educational value of such an easy-to-use robotics platform. Enter the <a href="http://ift.tt/16h9Hz6" target="_blank">BrickPi</a>.</p>
<p><a href="http://ift.tt/1gVY44q" target="_blank"><img alt="BrickPi board" src="http://ift.tt/1gVY44q" /></a></p>
<p><em>Bare BrickPi board</em></p>
<p>The BrickPi is a <a href="http://ift.tt/XtPXBX" target="_blank">RasbperryPi</a> add-on that lets you control Lego Mindstorm parts. The BrickPi stacks on top of the <a href="http://ift.tt/1o7Ssv1" itemprop="url" target="_bank" title="Raspberry Pi"><strong>Raspberry Pi</strong></a> and accepts Lego Mindstorms motors and sensors.</p>
<p><a href="http://ift.tt/1U3bpw8" target="_blank"><img alt="BrickPi on a Raspberry Pi" src="http://ift.tt/1qCvqO8" /></a></p>
<p><em>BrickPi on top of a Raspberry Pi</em></p>
<p>The BrickPi allows you to control Mindstorms parts using any number of languages including <a href="http://ift.tt/kqslcH" target="_blank">C</a>, <a href="http://ift.tt/o158tb" target="_blank">Python</a>, and <a href="http://ift.tt/zJPPhx" target="_blank">Scratch</a>.</p>
<h3>Covered in This Tutorial</h3>
<p>In this tutorial, we will cover how to get started with the BrickPi. We will show you how to connect the BrickPi to a Raspberry Pi, attach Legos, connect motors/sensors, and write a simple <a href="http://ift.tt/1LK8jLD" itemprop="url" target="_bank" title="Python"><strong>Python</strong></a> script to control the motors/sensors.</p>
<h3>Required Materials</h3>
<ul>
<li><a href="http://ift.tt/1hBTMlv" target="_blank">BrickPi</a></li>
<li><a href="http://ift.tt/XtPXBX" target="_blank">Raspberry Pi</a></li>
<li><a href="http://ift.tt/S9n9iR" target="_blank">SD Card</a></li>
<li><a href="http://ift.tt/UrWBEO" target="_blank">Monitor</a> of some sort</li>
<li><a href="http://ift.tt/ZHTtKe" target="_blank">HDMI Cable</a> or Composite cable</li>
<li><a href="http://ift.tt/1f2dCU2" target="_blank">Wall Adapter Power Supply – 9VDC</a></li>
<li><a href="http://ift.tt/1H247iX" target="_blank">DC Barrel Jack Adapter – Female</a></li>
<li><a href="http://ift.tt/1oJenVw" target="_blank">9V Snap Connector</a></li>
<li>Keyboard and mouse</li>
<li><a href="http://ift.tt/1qCvqOc" target="_blank">Lego Mindstorms Servo Motor</a></li>
<li><a href="http://ift.tt/1ppKxcC" target="_blank">Lego Mindstroms Touch Sensor</a></li>
</ul>
<p><strong>NOTE:</strong> The servo motor and touch sensor can also be found within the <a href="http://ift.tt/1guqZAC" target="_blank">Lego Mindstorms NXT</a> set.</p>
<h3>Suggested Reading</h3>
<ul>
<li><a href="http://ift.tt/1g7aMzr" target="_blank">Setting up Raspbian</a></li>
</ul>
</div>
<div class="section tutorial-page">
<h2 id="configure-sd-card">Configure SD Card</h2>
<p><strong>IMPORTANT</strong>: You need to use <a href="http://ift.tt/1qCvqOd" target="_blank">Dexter Industries’ custom Raspbian build</a> to get the BrickPi to work.</p>
<h3>Required Downloads</h3>
<ul>
<li>Download <a href="http://ift.tt/1U3bpwg" target="_blank">Dexter Industries’ Raspbian build</a></li>
<li>Download <a href="http://ift.tt/16wtiJO" target="_blank">Win32DiskImager</a></li>
<li><a href="http://www.7-zip.org/" target="_blank">7-Zip</a> to unzip the .rar <a href="http://ift.tt/1LIxY7j" itemprop="url" target="_bank" title="Raspbian"><strong>Raspbian</strong></a> image</li>
</ul>
<h3>Flash the SD Card</h3>
<ol>
<li>Insert the SD Card into your computer</li>
<li>Install <a href="http://ift.tt/16wtiJO" target="_blank">Win32DiskImager</a></li>
<li>Unzip <a href="http://ift.tt/1U3bpwg" target="_blank">Dexter Industries’ Raspbian build</a> (use <a href="http://www.7-zip.org/" target="_blank">7-Zip</a> if the image is in .rar form)</li>
<li>Run Win32DiskImager with administrative privileges</li>
<li>Select the unzipped Dexter Industries’ <a href="http://ift.tt/1UhpgQn" itemprop="url" target="_bank" title="Raspbian"><strong>Raspbian</strong></a> build as the Image File</li>
<li>Select the location of the SD Card</li>
<li>Click “Write”</li>
</ol>
<p><a href="http://ift.tt/1U3bsbg" target="_blank"><img alt="Win32DiskImager flashing Dexter Industries' Raspbian build" src="http://ift.tt/1U3bsbg" /></a></p>
<p><em>Don’t forget to Run as Administrator!</em></p>
</div>
<div class="section tutorial-page">
<h2 id="brickpi-assembly">BrickPi Assembly</h2>
<p>You will need to build the hardware around the BrickPi in order to connect it to the Raspberry Pi and Legos.</p>
<h3>Build the Case</h3>
<p>1) Unpack the BrickPi hardware and remove the protective paper from the case.</p>
<p><a href="http://ift.tt/1qCvqOf" target="_blank"><img alt="BrickPi parts" src="http://ift.tt/1U3bpwk" /></a></p>
<p>2) Screw the two small standoffs into the holes in the bottom piece of acrylic.</p>
<p><a href="http://ift.tt/1qCvrSl" target="_blank"><img alt="BrickPi assembly" src="http://ift.tt/1U3bsbm" /></a></p>
<p>3) Screw a Raspberry Pi onto the two bottom standoffs.</p>
<p><a href="http://ift.tt/1qCvqOj" target="_blank"><img alt="Raspberry Pi in BrickPi case" src="http://ift.tt/1U3bsbo" /></a></p>
<p>4) Screw the four long standoffs into corner slots of the bottom piece of acrylic.</p>
<p><a href="http://ift.tt/1qCvqOl" target="_blank"><img alt="BrickPi assembly process" src="http://ift.tt/1U3bsbq" /></a></p>
<p>5) Attach the BrickPi to the Raspberry Pi by mating the BrickPi’s header to the <a href="http://ift.tt/OUFZBA" target="_blank">Raspberry Pi’s GPIO header</a>.</p>
<p><a href="http://ift.tt/1U3bsbu" target="_blank"><img alt="BrickPi mounted on Raspberry Pi" src="http://ift.tt/1qCvrSp" /></a></p>
<p>6) (Optional) Now is a good time to label the motor and sensor ports on the BrickPi. I recommend S1, S2, and so on for the sensor ports and MA, MB, and so on for the motor ports.</p>
<p><a href="http://ift.tt/1U3bsbw" target="_blank"><img alt="BrickPi with labels" src="http://ift.tt/1qCvqOr" /></a></p>
<p>7) Attach the top piece of acrylic to the four posts using the remaining screws.</p>
<p><a href="http://ift.tt/1U3bpw8" target="_blank"><img alt="Fully assembled BrickPi with Raspberry Pi" src="http://ift.tt/1qCvqO8" /></a></p>
<p>8) Insert the SD card.</p>
<p><a href="http://ift.tt/1U3bpMC" target="_blank"><img alt="SD Card in Raspberry Pi inside BrickPi case" src="http://ift.tt/1qCvrSt" /></a></p>
<h3>Attach Legos</h3>
<p>Lego beams can be attached to the top and bottom pieces of acrylic in order to secure the BrickPi and Raspberry Pi to your Lego creation.</p>
<p><a href="http://ift.tt/1U3bpME" target="_blank"><img alt="Lego pegs in BrickPi case" src="http://ift.tt/1qCvr4F" /></a></p>
<p><em>Attach Lego pegs to the holes in the acrylic</em></p>
<p><a href="http://ift.tt/1U3bpMG" target="_blank"><img alt="Lego beam on BrickPi case" src="http://ift.tt/1qCvr4H" /></a></p>
<p><em>Attach Lego beams to the pegs</em></p>
<p>Any of the Lego Mindstorms sensors can be attached to the ports labeled with an “S” followed by a number. You will need to remember the port number that you plugged your sensor into.</p>
<p><a href="http://ift.tt/1U3bsrN" target="_blank"><img alt="BrickPi Lego motor port locations" height="210" src="http://ift.tt/1qCvr4J" width="302" /></a></p>
<p><em>Sensor port locations (Image courtesy of <a href="http://ift.tt/q8xruv" target="_blank">dexterindustries.com</a>)</em></p>
<p>Motors can be attached to the ports labeled with an “M” followed by a letter.</p>
<p><a href="http://ift.tt/1qCvr4M" target="_blank"><img alt="BrickPi Lego sensor port locations" height="210" src="http://ift.tt/1U3bsrR" width="302" /></a></p>
<p><em>Motor port locations (Image courtesy of <a href="http://ift.tt/q8xruv" target="_blank">dexterindustries.com</a>)</em></p>
<p>For this example, connect a single touch sensor to S1 and a single servo motor to MA.</p>
<p><a href="http://ift.tt/1qCvr4O" target="_blank"><img alt="Sensor and motor connected to the BrickPi" src="http://ift.tt/1U3bsrT" /></a></p>
<h3>Connect Peripherals</h3>
<p>Similar to the <a href="http://ift.tt/1qCvs8N" target="_blank">setting up the Raspberry Pi tutorial</a>, we need to connect a <a href="http://ift.tt/1UQBgqN" itemprop="url" target="_bank" title="keyboard"><strong>keyboard</strong></a>, mouse, and monitor. Plug a <a href="http://ift.tt/1Uhpirf" itemprop="url" target="_bank" title="install virtual keyboard raspberry pi"><strong>keyboard</strong></a> and mouse into the USB ports, and connect a monitor using an HDMI cable.</p>
<p><a href="http://ift.tt/1U3bsrX" target="_blank"><img alt="BrickPi and Raspberry Pi with connected peripherals" src="http://ift.tt/1qCvqOk" /></a></p>
</div>
<div class="section tutorial-page">
<h2 id="powering-the-brickpi">Powering the BrickPi</h2>
<p><a href="http://ift.tt/q8xruv" target="_blank">Dexter Industries</a> recommends a few different ways to provide power to your Lego robot.</p>
<p><a href="http://ift.tt/1U3bss0" target="_blank"><img alt="Powering the BrickPi" src="http://ift.tt/1qCvs8P" /></a></p>
<p><em>Dexter Industries’ guide to powering the BrickPi (Image courtesy of <a href="http://ift.tt/q8xruv" target="_blank">dexterindustries.com</a>)</em></p>
<p>However, we will do things differently. In order to get unlimited run time and the ability to power a couple of motors, we will hack a wall power supply to attach to the BrickPi.</p>
<p>1) Cut the 9V battery connector off of the <a href="http://ift.tt/1oJenVw" target="_blank">9V Snap Connector</a> and strip the ends.</p>
<p><a href="http://ift.tt/1U3bsIg" target="_blank"><img alt="Hacked BrickPi 9V connector" src="http://ift.tt/1qCvr4S" /></a></p>
<p>2) Attach the red wire to the positive (+) and the black wire to the negative (-) screw terminals of the <a href="http://ift.tt/1H247iX" target="_blank">DC Barrel Jack Adapter</a>.</p>
<p><a href="http://ift.tt/1U3bq3a" target="_blank"><img alt="Attach 9V connector ends to DC Barrel Jack Adapter" src="http://ift.tt/1qCvr4U" /></a></p>
<p>3) Plug the connector into the BrickPi.</p>
<p><a href="http://ift.tt/1U3bsIl" target="_blank"><img alt="Hacked 9V adapter on BrickPi" src="http://ift.tt/1qCvs8R" /></a></p>
<p>4) Plug the <a href="http://ift.tt/1f2dCU2" target="_blank">9V wall adapter</a> into the other end of the DC Barrel Jack Adapter.</p>
<p>5) <strong>IMPORTANT:</strong> Make sure your monitor is connected to the Raspberry Pi and turned on!</p>
<p>6) Plug the wall adapter power supply into a wall outlet.</p>
<p><strong>WARNING:</strong> The large power regulator (<a href="http://ift.tt/1vzlbpl" target="_blank">TO-220 Package</a>) gets hot! Be careful when plugging or unplugging the power adapter.</p>
<p><a href="http://ift.tt/1qCvs8T" target="_blank"><img alt="Highlighted regulator on BrickPi" src="http://ift.tt/1U3bsIp" /></a></p>
<p>7) Your Raspberry Pi should come to life!</p>
<p><a href="http://ift.tt/1qCvs8V" target="_blank"><img alt="Dexter Industries' custom Raspbian build" src="http://ift.tt/1U3bq3j" /></a></p>
</div>
<div class="section tutorial-page">
<h2 id="configure-the-rasbperry-pi">Configure the Raspberry Pi</h2>
<p>Once the Raspberry Pi has booted, you should be presented with the Dexter Industries desktop. If you are ever asked for a username or password, the defaults are:</p>
<p>Username: <strong>pi</strong><br />
Password: <strong>raspberry</strong></p>
<p><a href="http://ift.tt/1qCvu0k" target="_blank"><img alt="BrickPi Desktop" src="http://ift.tt/1U3bq3l" /></a></p>
<p>If you would like to configure the Raspberry Pi, open up a terminal:</p>
<p><a href="http://ift.tt/1qCvs8X" target="_blank"><img alt="Raspberry Pi Terminal" src="http://ift.tt/1U3bsIx" /></a></p>
<p>and enter the following command:</p>
</div>
<div class="section tutorial-page">
<pre>
<code>sudo raspi-config
</code>
</pre>
<p>You will be presented with the Raspberry Pi configuration screen. It is recommended that you expand the filesystem. Have a look at the other options (descriptions for the various options can be found <a href="http://ift.tt/1qCvu0o" target="_blank">here</a>).</p>
<p><a href="http://ift.tt/1U3bq3n" target="_blank"><img alt="Raspberry Pi configuration" src="http://ift.tt/1qCvu0q" /></a></p>
</div>
<div class="section tutorial-page">
<h2 id="programming">Programming</h2>
<p>Open a terminal (if you do not already have one open) and create a new file for our motor and sensor test. Open that file with Leadpad (Raspbian’s default text editor).</p>
</div>
<pre>
<code>leafpad motor_sensor.py
</code>
</pre>
<p>Enter the following code into the text editor:</p>
<pre data-language="language:python ,python">
</pre>
<pre data-language="language:python ,python">
<code class="rainbow">from BrickPi <span class="keyword">import</span> <span class="keyword operator">*</span>

<span class="function call">BrickPiSetup</span>()

BrickPi.SensorType[PORT_1] <span class="keyword operator">=</span> TYPE_SENSOR_TOUCH
BrickPi.MotorEnable[PORT_A] <span class="keyword operator">=</span> <span class="constant numeric">1</span>

<span class="function call">BrickPiSetupSensors</span>()

<span class="keyword">while</span> True:
        result <span class="keyword operator">=</span> <span class="function call">BrickPiUpdateValues</span>()
        <span class="keyword">if</span> not result:
                <span class="keyword">if</span> BrickPi.Sensor[PORT_1]:
                        BrickPi.MotorSpeed[PORT_A] <span class="keyword operator">=</span> <span class="constant numeric">200</span>
                <span class="keyword">else</span>:
                        BrickPi.MotorSpeed[PORT_A] <span class="keyword operator">=</span> <span class="constant numeric">0</span>
        time.<span class="function call">sleep</span>(<span class="constant numeric">0.01</span>)
</code>
</pre>
<p><a href="http://ift.tt/1U3bq3p" target="_blank"><img alt="Raspberry Pi Leafpad with BrickPi Python code" src="http://ift.tt/1qCvu0s" /></a></p>
<p>Save and exit out of Leafpad. In the console, enter the following:</p>
<div class="section tutorial-page">
<pre>
<code>python motor_sensor.py
</code>
</pre>
<p>Now, whenever you press the Lego Touch Sensor, the Servo Motor should move!</p>
<p><a href="http://ift.tt/1U3bqjD" target="_blank"><img alt="BrickPi Python example working" src="http://ift.tt/1qCvu0u" /></a></p>
<p>Press ctrl+c to end the program.</p>
</div>
<div class="section tutorial-page">
<h2 id="resources-and-going-further">Resources and Going Further</h2>
<p>The BrickPi opens up many opportunities to expand on the Lego Mindstorms kit. To learn more about Dexter Industries and the BrickPi, check out their website: <a href="http://ift.tt/16h9Hz6" target="_blank">http://ift.tt/16h9Hz6</a>.</p>
<p>If you are looking for some ideas, Dexter Industries updates their BrickPi site with interesting projects: <a href="http://ift.tt/1U3bqjF" target="_blank">http://ift.tt/1U3bqjF</a></p>
<h3>Resources</h3>
<ul>
<li>BrickPi hardware GitHub repository: <a href="http://ift.tt/16h9KuJ" target="_blank">http://ift.tt/16h9KuJ</a></li>
<li>BrickPi Python GitHub repository: <a href="http://ift.tt/1U3bqjH" target="_blank">http://ift.tt/1U3bqjH</a></li>
<li>BrickPi C GitHub repository: <a href="http://ift.tt/1qCvs90" target="_blank">http://ift.tt/1qCvs90</a></li>
<li>BrickPi Scratch repository: <a href="http://ift.tt/1U3bsYN" target="_blank">http://ift.tt/1U3bsYN</a></li>
</ul>
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Getting Started with the BrickPi

Introduction If you’re familiar with Lego Mindstorms , then you are probably aware of all the cool projects that you can make and the edu...

Hackers in Residence: The Sound Visualizer Pt. 2

Wall's Corners

Link Author

Title: Hackers in Residence: The Sound Visualizer Pt. 2
Author: Wall's Corners
Rating 5 of 5 Des:

Introduction This guide is a follow up to the first write up I did for my participation in the SparkFun HIR program . This guide shows ho...

<div class="section tutorial-page">
<h2 id="introduction">Introduction</h2>
<p>This guide is a follow up to the <a href="http://ift.tt/1FCSeD0" target="_blank">first write up</a> I did for <a href="http://ift.tt/1Df3T7S" target="_blank">my participation in the SparkFun HIR program</a>. This guide shows how to setup a music visualizer for PCs/laptops. It uses an RGB <a href="http://ift.tt/1Rq2vDU" itemprop="url" target="_bank" title="LED"><strong>LED</strong></a> panel to display the music visualization. It plays MP3s and is Java powered. This project differs from the first one in that it samples the data output to the computer’s sound card versus sampling ambient noise with a <a href="http://ift.tt/1govKHI" target="_blank">microphone</a> or a <a href="http://ift.tt/1pBok8f" target="_blank">Sparkfun sound detector</a>.</p>
<p><a href="http://ift.tt/1AIreLE" target="_blank"><img alt="sound visualizer" src="http://ift.tt/1dQuO1o" /></a></p>
<h3>Required Materials</h3>
<p>This project assumes you have access to a <a href="http://ift.tt/1FCSbae" target="_blank">PIXEL board</a>. Please note that I have no afiliation with the <a href="http://ledpixelart.com/" target="_blank">PIXEL project</a> other than I write software for it and Al gives me PIXEL hardware as incentive to write more software.</p>
<p>The PIXEL usually comes with an RGB <a href="http://ift.tt/1LK8gQ0" itemprop="url" target="_bank" title="LED"><strong>LED</strong></a> panel, but the board alone is also available. If only the PIXEL board was acquired, then this <a href="http://ift.tt/1bITNil" target="_blank">panel from Sparkfun</a> can be used with this project.</p>
<p>Other than a PIXEL unit, you need a PC or laptop that supports Java 8. To play the demo songs, an Internet connection is required. If no Internet connection is available, then select some MP3s on the filesystem for use with the music visualizer. More details on selecting MP3s from the local filesystem are below.</p>
<h3>Suggested Reading</h3>
<p>Before diving into this project, you may want to check out these other tutorials first.</p>
<ul>
<li><a href="http://ift.tt/1gQSpLb" target="_blank">Connector Basics</a></li>
<li><a href="http://ift.tt/1fcdfno" target="_blank">Light-emitting Diodes (LEDS)</a></li>
<li><a href="http://ift.tt/1HzHsKU" target="_blank">How LEDs Are Made</a></li>
<li><a href="http://ift.tt/1fcdfUg" target="_blank">RGB Panel Hookup Guide</a></li>
<li><a href="http://ift.tt/1gQSpel" target="_blank">Serial Communication</a></li>
</ul>
</div>
<div class="section tutorial-page">
<h2 id="hardware-assembly">Hardware Assembly</h2>
<h3>Pixel</h3>
<p>Use this <a href="http://ift.tt/1FCSe5R" target="_blank">quick start guide</a> to get familiar with the PIXEL hardware.</p>
<p>This project can use either Bluetooth or serial (USB) for communication between the PC and the PIXEL. Before continuing, make sure you can pair/connect with the PIXEL from your computer and run the <a href="http://ift.tt/1v3kR5W" target="_blank">sample ‘PC application’</a>.</p>
<p>Here is what the PIXEL could look like once assembled:</p>
<p><a href="http://ift.tt/1dQuQGw" target="_blank"><img alt="pixel attached to led panel" src="http://ift.tt/1AIrdY3" /></a></p>
</div>
<div class="section tutorial-page">
<h2 id="software-prerequisites-and-installation">Software Prerequisites and Installation</h2>
<h3>JRE</h3>
<p>This project requires Java 8 Standard Edition. Fortunately, Java runs on many platforms. Download and install the <a href="http://ift.tt/iqBXhF" target="_blank">JRE (Java Runtime Environment)</a> for your PC/laptop’s operating system.</p>
<h3>Java Application</h3>
<p>This project reuses an existing app to sample data from the computer’s sound card. The app uses the modern media API for Java, JavaFX, to play MP3s. The original developer is Jasper Pots.</p>
</div>
<div class="section tutorial-page"></div>
<div class="section tutorial-page">
<h2 id="software-usage">Software Usage</h2>
<h3>Running the App</h3>
<p>Once Java 8 SE is installed, run the application by double clicking the JAR file you downloaded above. This will bring up the user interface for the application.</p>
<p><a href="http://ift.tt/1dQuO1u" target="_blank"><img alt="UI" src="http://ift.tt/1dQuQGB" /></a></p>
<p>If Bluetooth is used, then a system tray popup is shown, prompting for the passcode to pair with the PIXEL. Enter the passcode for your PIXEL board (0000 for V2, 4545 for V1), before the popup dismisses itself. Otherwise, an application restart is needed to try pairing again.</p>
<p>Once the PIXEL connection is initialized, a yellow message scrolls across the RGB LED panel. Then a sample music file is downloaded and the music visualization begins on the RGB LED panel.</p>
<p>Here is a quick demo:</p>
<p><iframe width="678" height="381" src="https://www.youtube.com/embed/XHuEiVm4SVA?feature=oembed" frameborder="0" allowfullscreen=""></iframe></p>
<div class="section tutorial-page">
<h3>Playing Local MP3 Files</h3>
<p>Use the ‘Load’ button to play MP3s on the local filesystem.</p>
<p><a href="http://ift.tt/1AIreLP" target="_blank"><img alt="UI2" src="http://ift.tt/1dQuQGD" /></a></p>
</div>
<div class="section tutorial-page">
<h2 id="res">Resources and Going Further</h2>
<h3>Source Code</h3>
<p>The original source code for the equalizer was made available by <a href="http://ift.tt/1AIrdYb" target="_blank">Jasper Pots</a>. I added PIXEL/IOIO code to visualize the music on an LED panel, as well. The source code for this project is available at <a href="http://ift.tt/1dQuO1y" target="_blank">this GitHub repo</a>.</p>
<h3>Changing Colors</h3>
<p>The color for the sound visualizer is hardcoded to SparkFun red. This hard coded color is defined in the <code>Pixel#drawEqualizer()</code> method, but it could be made configurable at runtime.</p>
<p>See the ‘Modify the Java App’ section of the <a href="http://ift.tt/1FCSeD0" target="_blank">Sound Visualizer</a> tutorial, for more details on how to make modifications with Netbeans and re-build the app to see code changes.</p>
<p> </p>
</div>
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Hackers in Residence: The Sound Visualizer Pt. 2

Introduction This guide is a follow up to the first write up I did for my participation in the SparkFun HIR program . This guide shows ho...

NFC Card Reader and the Raspberry Pi

Wall's Corners

Link Author

Title: NFC Card Reader and the Raspberry Pi
Author: Wall's Corners
Rating 5 of 5 Des:

This example will show how to use a Adafruit NFC shield to read an NFC card using the Arduberry. Hardware Required: Raspberry Pi Ardu...

<p>This example will show how to use a Adafruit NFC shield to read an NFC card using the Arduberry.</p>
<p><strong> <a href="http://ift.tt/1MDYmQu" target="_blank"><img alt="Raspberry Pi and Near Field Communication Shield" class="size-medium wp-image-186 alignright" height="225" src="http://ift.tt/20RtTkl" width="300" /></a> Hardware Required:</strong></p>
<ol>
<li>Raspberry Pi</li>
<li>Arduberry</li>
<li><a href="http://ift.tt/SvyvHl" target="_blank">Adafruit NFC Shield</a></li>
<li>NFC Cards</li>
</ol>
<h3><strong>Step 1</strong></h3>
<p>Slide on the Adafruit NFC shield on the Arduberry and power on the <a href="http://ift.tt/1UIqQdK" itemprop="url" target="_bank" title="Raspberry"><strong>Raspberry</strong></a> Pi.</p>
<p><strong><a href="http://ift.tt/1MDYlMe" target="_blank"><img alt="Raspberry Pi and Adafruit Near Field Communication Shield for Arduino" class="alignnone size-medium wp-image-187" height="225" src="http://ift.tt/20RtQF8" width="300" /></a></strong></p>
<h3> Step 2</h3>
<p>Download the <a href="http://ift.tt/1MDYn6K" target="_blank">Adafruit NFC shield I2C library</a> on the Raspberry Pi using the Netsurf Browser and save it in<strong> /usr/share/Arduino/libraries</strong> and extract it there.</p>
<p><a href="http://ift.tt/20RtTkn" target="_blank"><img alt="nfc_lib_dwld" class="size-large wp-image-75 aligncenter" height="769" src="http://ift.tt/1MDYlMi" width="1024" /></a></p>
<h3>Step 3</h3>
<p>Open <a href="http://ift.tt/1pCdnqV" itemprop="url" target="_bank" title="Arduino"><strong>Arduino</strong></a>, and open the example <b>readMifare </b>from the <strong>Adafruit_NFCShield_I2C </strong>folder. Change the programmer to <strong>Raspberry Pi GPIO</strong> and <strong>upload</strong> the sketch to the Arduberry(use Ctrl+Shift+U).<a href="http://ift.tt/20RtQFa" target="_blank"><img alt="upload4" class="aligncenter size-full wp-image-306" height="293" src="http://ift.tt/1MDYn6N" width="295" /></a><a href="http://ift.tt/20RtTAH" target="_blank"><br /></a></p>
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<p><a href="http://ift.tt/1MDYlMo" target="_blank"><img alt="open" class="alignnone size-large wp-image-76" height="770" src="http://ift.tt/20RtQVu" width="1024" /></a></p>
<h3>Step 4</h3>
<p>The data that is coming from the NFC shield is coming at 115200 baud, so we need to configure minicom. Open a terminal and open minicom setup</p>
<pre>
minicom -s
</pre>
<p><a href="http://ift.tt/1MDYn6R" target="_blank"><img alt="mincom_s" class="size-medium wp-image-77 aligncenter" height="225" src="http://ift.tt/20RtQVy" width="300" /></a> Go to <strong>Serial Port Menu</strong> and press Enter <a href="http://ift.tt/1MDYlMq" target="_blank"><img alt="serial_port_menu" class="size-medium wp-image-79 aligncenter" height="225" src="http://ift.tt/20RtTAL" width="300" /></a>   Press <strong>A </strong>to select the device and change it to <strong>/dev/ttyAMA0</strong> and press enter to save it. Also press <strong>F </strong>to disable Hardware Flow Control. Press <strong>Enter</strong> to save the settings. <a href="http://ift.tt/1MDYm2G" target="_blank"><img alt="settings" class="size-medium wp-image-80 aligncenter" height="225" src="http://ift.tt/20RtTAP" width="300" /></a> Select <strong>Exit</strong> to open minicom. <a href="http://ift.tt/1MDYm2I" target="_blank"><img alt="exit" class="size-medium wp-image-81 aligncenter" height="226" src="http://ift.tt/20RtTAR" width="300" /></a></p>
<h3> Step 5</h3>
<p>Now place the NFC card over the Shield to see the data stored in the NFC card. <a href="http://ift.tt/1MDYn6X" target="_blank"><img alt="data_card" class="size-full wp-image-82 aligncenter" height="776" src="http://ift.tt/20RtTAT" width="1035" /></a></p>
<p><a href="http://ift.tt/1MDYn70" target="_blank"><img alt="Raspberry Pi and NFC Shield" class="aligncenter size-medium wp-image-184" height="225" src="http://ift.tt/20RtTR7" width="300" /></a></p>
<p> </p>
<p> </p>
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NFC Card Reader and the Raspberry Pi

This example will show how to use a Adafruit NFC shield to read an NFC card using the Arduberry. Hardware Required: Raspberry Pi Ardu...

How To Overclock Your Raspberry Pi

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NFC Card Reader and the Raspberry Pi

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