Your Smart IOT

<div class="section tutorial-page">
<h2 id="introduction-">Introduction</h2>
<p>This tutorial shows how to put together a sound visualizer that I created, during <a href="http://bit.ly/1ToVC6a" target="_blank">my time in the SparkFun HIR program</a>. The end goal for the project was to have a sound reactive <a href="http://bit.ly/1WT6RcH" itemprop="url" target="_bank" title="LED"><strong>LED</strong></a> belt buckle. To accomplish the task of sound visualization, a <a href="http://bit.ly/26nCm2K" itemprop="url" target="_bank" title="Raspberry"><strong>Raspberry</strong></a> Pi drives and communicates with a Pixel Board over USB. The Pixel takes input from a microphone (or the SparkFun <a href="http://bit.ly/1ToVzHF" itemprop="url" target="_bank" title="Sound"><strong>Sound</strong></a> Detector) and passes it back to a Java application running on the Raspberry Pi. The Java application then processes the sound input values and sends commands to the Pixel to drive the RGB LED panel.</p>
<p><a href="http://bit.ly/1WBzSct" target="_blank"><img alt="alt text" src="http://bit.ly/1ToVzHH" /></a></p>
<p><em>The final project, displaying a quick Pac-Man demo.</em></p>
<h3>Required Materials</h3>
<p>Here is a list of SparkFun parts used in this project, if you would like to follow along.</p>
<div>
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<div class="sfe-title"><a href="http://bit.ly/1WBzScu" target="_blank">HIR Program – Sound Visualizer <span class="sfewl">SparkFun Wish List</span></a><br />
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<div class="sfe-row"><a href="http://bit.ly/1WBzV7U" target="_blank"><img alt="" class="sfe-thumbnail" height="58" src="http://bit.ly/1ToVC6d" width="58" /><span class="sfe-text"><span class="sfe-item-title">SparkFun Electret Microphone Breakout <span class="sfe-sku">BOB-09964</span></span><span class="sfe-description">Ready to add audio to your next project? This small breakout board couples a small electret microphone with a 100x opamp to amplify the sounds of voic…</span></span></a></div>
<div class="sfe-row"><a href="http://bit.ly/1WBzUAR" target="_blank"><img alt="" class="sfe-thumbnail" height="58" src="http://bit.ly/1ToVzY0" width="58" /><span class="sfe-text"><span class="sfe-item-title">SparkFun Sound Detector <span class="sfe-sku">SEN-12642</span></span><span class="sfe-description">The SparkFun Sound Detector is a small and very easy to use audio sensing board with three different outputs. The Sound Detector not only provides an …</span></span></a></div>
<div class="sfe-row"><a href="http://bit.ly/1WBzUAU" target="_blank"><img alt="" class="sfe-thumbnail" height="58" src="http://bit.ly/1ToVzY4" width="58" /><span class="sfe-text"><span class="sfe-item-title">SparkFun LiPo Charger Basic – Micro-USB <span class="sfe-sku">PRT-10217</span></span><span class="sfe-description">If you need to charge LiPo batteries, this simple charger will do just that, and do it fast! The SparkFun LiPo Charger Basic is stripped down of all f…</span></span></a></div>
<div class="sfe-row"><a href="http://bit.ly/1WBzUAX" target="_blank"><img alt="" class="sfe-thumbnail" height="58" src="http://bit.ly/1ToVzY8" width="58" /><span class="sfe-text"><span class="sfe-item-title">Barrel Jack Adapter – USB to 5.5mm <span class="sfe-sku">TOL-08639</span></span><span class="sfe-description">This is a simple cable that adapts from a USB port to a 5.5×2.1mm barrel connector, center positive. This cable allows the user to use a USB port on a…</span></span></a></div>
<div class="sfe-row"><a href="http://bit.ly/1WBzUB0" target="_blank"><img alt="" class="sfe-thumbnail" height="58" src="http://bit.ly/1ToVC6g" width="58" /><span class="sfe-text"><span class="sfe-item-title">USB Micro-B Cable – 6″ <span class="sfe-sku">CAB-13244</span></span><span class="sfe-description">This is a USB 2.0 type B to Micro-B 5-pin black cable. You know, the mini-B connector that usually comes with cell phones, Cameras, MP3 players, etc. …</span></span></a></div>
<div class="sfe-row"><a href="http://bit.ly/1WBzV82" target="_blank"><img alt="" class="sfe-thumbnail" height="58" src="http://bit.ly/1ToVzYc" width="58" /><span class="sfe-text"><span class="sfe-item-title">Polymer Lithium Ion Battery – 2000mAh <span class="sfe-sku">PRT-08483</span></span><span class="sfe-description">These are very slim, extremely light weight batteries based on the new Polymer Lithium Ion chemistry. This is the highest energy density currently in …</span></span></a></div>
<div class="sfe-row"><a href="http://bit.ly/1WBzV83" target="_blank"><img alt="" class="sfe-thumbnail" height="58" src="http://bit.ly/1ToVCmA" width="58" /><span class="sfe-text"><span class="sfe-item-title">RGB LED Panel – 16×32 <span class="sfe-sku">COM-12583</span></span><span class="sfe-description">Are you looking to add a lot of color to your project? These large 32×16 RGB LED panels are an awesome place to start. You can create animations, game…</span></span></a></div>
<div class="sfe-row"><a href="http://bit.ly/24g3KRD" target="_blank"><img alt="" class="sfe-thumbnail" height="58" src="http://bit.ly/1WBzUB3" width="58" /><span class="sfe-text"><span class="sfe-item-title">Raspberry Pi – Model B+ <span class="sfe-sku">DEV-12994</span></span><span class="sfe-description">Who wants pi? The Raspberry Pi has made quite a splash since it was first announced. The credit-card sized computer is capable of many of the things t…</span></span></a></div>
<div class="sfe-footer"><a class="button" href="http://bit.ly/1WBzScu" target="_blank">VIEW HIR PROGRAM – SOUND VISUALIZER ON SPARKFUN.COM</a></div>
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</div>
<h4>Additional Supplies</h4>
<p>Also used in this project is the <a href="http://bit.ly/1ToVAes" target="_blank">Pixel Board</a>, which is used to control LED matrices. More info on this product can be found <a href="http://bit.ly/1WBzV86" target="_blank">here</a>.</p>
<h4>Data Connection</h4>
<p>The Raspberry Pi needs a serial connection to the Pixel. A <a href="http://amzn.to/1ToVAet" target="_blank">male to male USB cable</a> is needed for this connection.</p>
<h4>Power</h4>
<p>Often the Raspberry Pi is powered from <a href="http://bit.ly/1WBzV87" target="_blank">wall Adapter Power Supplies</a>. However, for this project, I wanted the entire setup to be mobile/wearable. Thus, LiPo batteries were used to power the Raspberry Pi and the Pixel Board in conjunction with some <a href="http://bit.ly/1ToVCmF" target="_blank">boost circuitry</a>. You could also use a beefy battery pack, such as <a href="http://bit.ly/1WBzUB7" target="_blank">this one</a>, to power this project on the go.</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://bit.ly/1ToVAew" target="_blank">Connector Basics</a></li>
<li><a href="http://bit.ly/1WBzUB8" target="_blank">Light-emitting Diodes (LEDS)</a></li>
<li><a href="http://bit.ly/1ToVCmG" target="_blank">How LEDs Are Made</a></li>
<li><a href="http://bit.ly/1WBzUB9" target="_blank">RGB Panel Hookup Guide</a></li>
<li><a href="http://bit.ly/1ToVAex" target="_blank">Serial Communication</a></li>
</ul>
</div>
<div class="section tutorial-page">
<h2 id="hardware-assembly">Hardware Assembly</h2>
<h3>Raspberry Pi</h3>
<p>If you’re new to Raspberry Pi, SparkFun has a <a href="http://bit.ly/1ToVCmL" target="_blank">Getting Started with Rasbian Guide</a>. There is also plenty of great info to setup your Raspberry Pi <a href="http://bit.ly/26JmNCv" target="_blank">on the Raspberry Pi Website</a> . Come on back once you have your Pi booting into Rasbian.</p>
<h3>Pixel</h3>
<p>Use <a href="http://bit.ly/1WBzURm" target="_blank">this quick start guide</a> to get familiar with the Pixel hardware.</p>
<h3>Attaching a Microphone</h3>
<p>The Pixel board has several ports for attaching input sensors or output components. This project uses the SparkFun microphone or the SparkFun Sound Detector. The Pixel board uses <a href="http://bit.ly/26JmQhE" target="_blank">Grove ports</a>, while the SparkFun breakouts do not, so the port housing needs to be removed to attach the microphone. A pair of needle nose pliers can be used to gently remove the port housing.</p>
<p>Using some <a href="http://bit.ly/1ToVAeD" target="_blank">female to female jumper wires</a>, cut one in half, and solder the bare end directly to the microphone (or Sound Detector). You can also use <a href="http://bit.ly/26JmNCy" target="_blank">hookup wire</a> if you do not wish to cut your jumper wires. Then use the female end to connect to header pins on the Pixel board.  <a href="http://amzn.to/1WBzURn" target="_blank">E6000</a>, or any other adhesive you have around, can be used to better secure the <a href="http://bit.ly/1ToVAeD" target="_blank">female jumper wire</a> to the Pixel board.</p>
<p>Here is the Pixel board before the port housing is removed:</p>
<p><a href="http://bit.ly/26JmNCz" target="_blank"><img alt="alt text" src="http://bit.ly/1ToVAeF" /></a></p>
<p>Gently pull on the sides of the port housing until it comes off the board.</p>
<p>On the Pixel board, the microphone port is the one closest to the end of the board. Here is the Pixel board with the housing for the microphone port removed:</p>
<p><a href="http://bit.ly/26JmNCA" target="_blank"><img alt="alt text" src="http://bit.ly/1ToVCmR" /></a></p>
<p>Although the physical port location differs between the V1 and V2 Pixel boards, the SparkFun Sound Detector (or other microphone) is connected to the pin labeled 31 for both versions.  Ground is connected to ground, and Vcc is connected to the power pin.</p>
<p>Here is the SparkFun Sound Detector attached to the Pixel board.</p>
<p><a href="http://bit.ly/26JmQhJ" target="_blank"><img alt="alt text" src="http://bit.ly/1ToVCmS" /></a></p>
<h4>Pixel V2</h4>
<p>If you are using V2 of the Pixel Board, your setup will look different. For the V2 Pixel board, the microphone port is the middle one of the 5 ports. The following image shows the SparkFun Mic Breakout attached to this port on the Pixel V2.</p>
<p><a href="http://bit.ly/26JmNCB" target="_blank"><img alt="alt text" src="http://bit.ly/1ToVAeI" /></a></p>
<h3>Powering the Pixel</h3>
<p>This project powers the Pixel with a <a href="http://bit.ly/26JmNCE" target="_blank">PowerBoost 1000</a> and a <a href="http://bit.ly/1WBzV82" target="_blank">LiPo Battery</a>. You could also use a <a href="http://bit.ly/1WBzUB7" target="_blank">rechargeable battery pack</a> for this. The Pixel connects to the PowerBoost with a <a href="http://bit.ly/1WBzUAX" target="_blank">USB to barrel jack</a>, as seen in the next photo.</p>
<p><a href="http://bit.ly/1ToVAeJ" target="_blank"><img alt="alt text" src="http://bit.ly/26JmQhL" /></a></p>
<h3>Male to Male USB Connection for Pixel and Raspberry Pi</h3>
<p>The Java application used in this project communicates from the Raspberry Pi to the Pixel hardware over a serial USB connection. A male to male USB cable is required for this connection. Here is a photo showing the male to male USB cable connecting the Raspberry Pi to the Pixel board:</p>
<p><a href="http://bit.ly/1ToVCD6" target="_blank"><img alt="alt text" src="http://bit.ly/26JmQhO" /></a></p>
<h3>All Together Now</h3>
<p>Here is the project with all electronic components connected.</p>
<p><a href="http://bit.ly/1WBzSct" target="_blank"><img alt="alt text" src="http://bit.ly/1ToVzHH" /></a></p>
</div>
<div class="section tutorial-page">
<h2 id="software-prerequisites-and-installation-">Software Prerequisites and Installation</h2>
<p>Before executing the Sound Visualizer code, we need to make sure a few dependencies are installed first.</p>
<h3>Raspbian</h3>
<p>Again, make sure that you are using the most up to date version of Rasbian and not a different flavor of the Raspberry Pi OS. We cannot guarantee this will work on other distributions of the Pi OS. The Raspberry Pi foundation has great <a href="http://bit.ly/1ToVAuY" target="_blank">guides to get Raspbian installed</a> on the Raspberry Pi, should you still need to do that.</p>
<h3>Java 7</h3>
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<p>The latest version of <a href="http://bit.ly/1r9FWNe" itemprop="url" target="_bank" title="Raspbian"><strong>Raspbian</strong></a> comes with a Java 7 virtual machine (JVM). If you have an older version of <a href="http://bit.ly/24g3KRq" itemprop="url" target="_bank" title="Raspbian"><strong>Raspbian</strong></a> installed, then update and install Java.</p>
<div class="copy-code" data-code-id="code-0"><button class="btn btn-default btn-sm">COPY CODE</button></div>
<pre>
<code>sudo apt-get update
sudo apt-get install oracle-java-jdk
</code>
</pre>
<h3>Java Application</h3>
<p>The Java application for this project is distributed as a Java archive file or JAR. Download it with the link below:</p>
<p><a class="btn btn-default" href="http://bit.ly/26JmQhP" target="_blank">DOWNLAOD THE JAR FILE</a></p>
<p>Copy the JAR file to the Raspberry Pi. An scp command can do this task:</p>
<div class="copy-code" data-code-id="code-1"><button class="btn btn-default btn-sm">COPY CODE</button></div>
<pre>
<code>scp sound-visualizer.jar pi@raspberrypi.local
</code>
</pre></div>
<div class="section tutorial-page">
<h2 id="software-usage-">Software Usage</h2>
<p>Now we will discuss how to execute the Sound Visualizer file.</p>
<h3>Starting the Application</h3>
<p>The SSH program allows you to login to the Raspberry Pi.</p>
<div class="copy-code" data-code-id="code-2"><button class="btn btn-default btn-sm">COPY CODE</button></div>
<pre>
<code>ssh pi@raspberrypi.local
</code>
</pre>
<p>Once logged in via ssh, run the application from the JAR file that was copied to the Raspberry Pi. This command runs the application:</p>
<div class="copy-code" data-code-id="code-3"><button class="btn btn-default btn-sm">COPY CODE</button></div>
<pre>
<code>java -jar sound-visualizer.jar
</code>
</pre>
<h3>Web GUI</h3>
<p>With the application running, the Web controls for the the sound visualizer are available at this URL:</p>
<div class="copy-code" data-code-id="code-4"><button class="btn btn-default btn-sm">COPY CODE</button></div>
<pre>
<code>http://bit.ly/1ToVAuZ
</code>
</pre>
<div class="alert alert-warning">Heads up! Make sure you replace this IP address with the correct IP address or hostname of your Raspberry Pi.</div>
<p>Here is a screen grab of the Web interface:</p>
<p><a href="http://bit.ly/26JmQhQ" target="_blank"><img alt="alt text" src="http://bit.ly/1ToVCDh" /></a></p>
<h3>Modes</h3>
<p>The application has several modes. The sound visualization mode is controlled by a drop down menu on the Web interface.</p>
<ul>
<li>Off – stops all animation</li>
<li>Blob – like a scatter plot; more sound gives more dots</li>
<li>Bottom Up – draws lines from the bottom; more sound gives longer lines</li>
<li>Rectangle – shows concentric rectangles; more sound gives larger rectangles</li>
<li>Circle – similar to a pie chart with two sections; more sound increases the colored arc’s size</li>
<li>Wave Graph – similar to the Bottom Up mode, but is centered vertically</li>
</ul>
<h3>Quitting the App</h3>
<p>The Java application is terminated by sending it an HTTP request for this URL:</p>
<div class="copy-code" data-code-id="code-5"><button class="btn btn-default btn-sm">COPY CODE</button></div>
<pre>
<code>http://bit.ly/26JmQhR
</code>
</pre>
<p>Again, replace the IP address above with the actual IP or hostname of the Raspberry Pi.</p>
<h3>Demonstration Video</h3>
<p>Here is a video of the project in action.</p>
</div>
<p><iframe width="678" height="381" src="https://www.youtube.com/embed/IyH7Rpe7xtI?feature=oembed" frameborder="0" allowfullscreen=""></iframe></p>
<p> </p>
<h2 id="res">Resources and Going Further</h2>
<p>If you’d like to explore more information about this project or remix it and implement it yourself, here are some helpful resources and tips for going further with this project.</p>
<h3>Initialization Daemon</h3>
<p>Having the application run at boot makes for a huge convenience. It avoids having to SSH into the Raspberry Pi to start the app if/when it re-boots. Install an init.d script to have the application start at every reboot.</p>
<h3>Modify the Java App</h3>
<p>The source code is available on Github Clone both repositories below.</p>
<ul>
<li>The main application is in <a href="http://bit.ly/1ToVAv0" target="_blank">this repository</a>.</li>
<li>The Pixel APIs are in <a href="http://bit.ly/26JmNCF" target="_blank">this repository</a>.</li>
</ul>
<p>Netbeans is the preferred IDE for PIXEL development. Open the subproject named ‘sound-visualizer’ from the directory where you cloned the main Github project. Open the ‘pixel-commons’ project from the directory where you cloned the Pixel APIs.</p>
<ul>
<li>The classes that do the sound visualizations are in the org.onebeartoe.pixel.sound.meter package, in the pixel-commons project.</li>
<li>Make any changes you would like to see.</li>
</ul>
<p>Compile and run the app with the F6 key.</p>
<p>Issue the following command to package changes into a new JAR file.</p>
<div class="copy-code" data-code-id="code-6"><button class="btn btn-default btn-sm">COPY CODE</button></div>
<pre>
<code>mvn package 
</code>
</pre>
<p>Copy the new ‘with-dependencies’ JAR file, found under the target/ directory, to the Raspberry Pi. Now, run the app with the new code changes.</p>
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Hackers in Residence: The Sound Visualizer

Introduction This tutorial shows how to put together a sound visualizer that I created, during my time in the SparkFun HIR program . The ...

Hackers in Residence: The Sound Visualizer

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