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reflow.html
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<!DOCTYPE html>
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<title>Pallette: Open Source Tongue-Computer Interface</title>
<meta name="description" content="A wireless universal remote control for the tongue, Pallette aims to provide greater independence for the mobility impaired. Pallatte fits in your mouth like a mouth guard and allows your tongue to operate as a Bluetooth mouse. Telekinesis with your tongue :p">
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<div class="featured-image">
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<div class="entry-meta">
<div class="entry-date">
<strong> Step 0 </strong>
</div>
</div>
<h2>Materials</h2>
<div class="entry-summary">
<p>Getting materials together</p>
</div>
</article>
</a>
<a href="mouthguard.html">
<article>
<div class="featured-image">
<img src="imgs/MakingTilePics/Mouthguard.png" alt="" />
</div>
<div class="entry-meta">
<div class="entry-date">
<strong>Step 1</strong>
</div>
</div>
<h2>Mouthguard</h2>
<div class="entry-summary">
<p>Begin by fitting your mouth</p>
</div>
</article>
</a>
<a href="imprint.html">
<article>
<div class="featured-image">
<img src="imgs/MakingTilePics/Imprint.png" alt="" />
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<div class="entry-date">
<strong>Step 2</strong>
</div>
</div>
<h2>Imprint</h2>
<div class="entry-summary">
<p>Use clay to achieve the overall shape of your upper teeth</p>
</div>
</article>
</a>
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<img src="imgs/MakingTilePics/Reflow.png" alt="" />
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<div class="entry-date">
<strong>Step 3</strong>
</div>
</div>
<h2>*Reflow</h2>
<div class="entry-summary">
<p>Optional, reflow soldering of Pallette PCBs</p>
</div>
</article>
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<article>
<div class="featured-image">
<img src="imgs/MakingTilePics/Ribbon.png" alt="" />
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<div class="entry-meta">
<div class="entry-date">
<strong>Step 4</strong>
</div>
</div>
<h2>Ribbon</h2>
<div class="entry-summary">
<p>Connect boards via ribbon cables according to the form of your mouth</p>
</div>
</article>
</a>
<a href="program.html">
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<div class="featured-image">
<img src="imgs/MakingTilePics/Program.png" alt="" />
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<div class="entry-meta">
<div class="entry-date">
<strong>Step 5</strong>
</div>
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<h2>Program</h2>
<div class="entry-summary">
<p>Upload firmware and observe interaction</p>
</div>
</article>
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<article>
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<img src="imgs/MakingTilePics/Seal.png" alt="" />
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<div class="entry-date">
<strong>Step 6</strong>
</div>
</div>
<h2>Seal</h2>
<div class="entry-summary">
<p>Waterproof the Pallette electronics</p>
</div>
</article>
</a>
<a href="sew.html">
<article>
<div class="featured-image">
<img src="imgs/MakingTilePics/Complete.png" alt="" />
</div>
<div class="entry-meta">
<div class="entry-date">
<strong>Step 7</strong>
</div>
</div>
<h2>Sew</h2>
<div class="entry-summary">
<p>Unite form and function</p>
</div>
</article>
</a>
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<article>
<div class="featured-image">
<img src="imgs/MakingTilePics/FutureTile.png" alt="" />
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<div class="entry-meta">
<div class="entry-date">
<strong>Step 8</strong>
</div>
</div>
<h2>Finish!</h2>
<div class="entry-summary">
<p>Take Pallette further</p>
</div>
</article>
</a>
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<strong>Step 3</strong> / Making Pallette
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<h1>Reflow Soldering</h1>
<p>If you have the PCBs assembled by an external PCB assembler, you can skip this step and go straight ahead to the next step. But if you want to reflow solder the Pallette PCBs youself, please follow the instructions below.</p>
<!-- WYSIWYG content of post ___-->
<table class="material">
<tr>
<th>What you will need</th>
</tr>
<tr>
<td>
<label class="pallette-checkbox">
<input type="checkbox"><span></span>
<a href="http://www.digikey.com/short/3hz814" target="_blank">Electronic Components</a>
</label>
<label class="pallette-checkbox">
<input type="checkbox"><span></span>
<a href="http://www.digikey.com/product-detail/en/chip-quik-inc/SMD291SNL/SMD291SNL-ND/1160001" target="_blank">RoHS Compliant Solder Paste</a>
</label>
<label class="pallette-checkbox">
<input type="checkbox"><span></span>
<a href="http://www.digikey.com/product-detail/en/chip-quik-inc/SMD291NL/SMD291NL-ND/1160000" target="_blank">RoHS Compliant Flux</a>
</label>
<label class="pallette-checkbox">
<input type="checkbox"><span></span>
<a href="https://amzn.com/B01564B882" target="_blank">Electronic Hot Plate Preheating Station</a> or <a href="https://amzn.com/B01JE6EX1C" target="_blank">Hot Air Soldering Rework Station</a>
</label>
<label class="pallette-checkbox">
<input type="checkbox"><span></span>
<a href="https://amzn.com/B00A9MRI3G" target="_blank">Tweezers</a>
</label>
<label class="pallette-checkbox">
<input type="checkbox"><span></span>
Pallette PCBs
</label>
</td>
</tr>
</table>
<p>A complete Pallette circuitry consists of four boards (as shown in the photo below, from left to right): a Battery Board, a Voltage Regulator Board, a Sensor Board, and a Microcontroller Board.</p>
<p><img class="alignnone instruction" src="imgs/materials/DSC06584.JPG" alt="" /></p>
<p>The photos below show you the process of reflow solder the Voltage Regulator Board.</p>
<p><img class="alignnone instruction" src="imgs/reflow/DSC06600.JPG" alt="" /></p>
<p>First apply solder paste on the solder pads.</p>
<p><img class="alignnone instruction" src="imgs/reflow/DSC06603.JPG" alt="" /></p>
<p>Next, place components on their designated locations. Make sure the polarities of the tantalum polymer capacitor and the LED are correct. The '+' symbol on one side of the footprint indicates anode.</p>
<p><img class="alignnone instruction" src="imgs/reflow/DSC06627.JPG" alt="" /></p>
<p>Turn on the hot plate, set the temperature to 210°C (410°F). When the temperature of the hotplate reaches 210°C, use tweezers to place the PCB to the center of the hotplate, wait until the solder paste melts completely (when the solder paste is shinning), then carefully remove the PCB from the hotplate using tweezers.</p>
<p><img class="alignnone instruction" src="imgs/reflow/DSC06646.JPG" alt="" /></p>
<p>The video below lets you catch a glimpse of reflow soldering of the Pallette PCBs. </p>
<div class="video-wrapper"><iframe src="https://www.youtube.com/embed/g6qw5Mp_XD8" frameborder="0" allowfullscreen></iframe></div>
<p>You can also watch the tutorial videos below to learn reflow soldering. For more resources, please go <a href="https://www.google.com/webhp?ie=UTF-8#q=how+to+surface+mount+soldering" target="_blank">here</a>.</p>
<div class="video-wrapper"><iframe src="https://www.youtube.com/embed/videoseries?list=PLSdxNjcHc0u8exSBNUxJ9Bno6fuuT1x6R" frameborder="0" allowfullscreen></iframe></div>
<div class="video-wrapper"><iframe src="https://www.youtube.com/embed/3NN7UGWYmBY" frameborder="0" allowfullscreen></iframe></div>
<div class="video-wrapper"><iframe src="https://www.youtube.com/embed/c_Qt5CtUlqY" frameborder="0" allowfullscreen></iframe></div>
<p>The component placement of the four boards is shown below.</p>
<p><img class="alignnone instruction" style="width:100%" src="imgs/reflow/TopDesignator.png" alt="" /></p>
<p><img class="alignnone instruction" style="width:100%" src="imgs/reflow/TopValue.png" alt="" /></p>
<p>You can find more Pallette hardware schematics and drawings <a href="https://github.com/joanaz/Pallette-Hardware/tree/master/Pallette_Rev1_Fabrication" target="_blank">here</a>. Once you finished soldering, your boards should look like this.</p>
<p>
<ol>
<li>The Battery Board
<p><img class="alignnone instruction" src="imgs/reflow/DSC06659.JPG" alt="" /></p>
</li>
<li>The Voltage Regulator Board
<p><img class="alignnone instruction" src="imgs/reflow/DSC06657.JPG" alt="" /></p>
</li>
<li>The Sensor Board
<p><img class="alignnone instruction" src="imgs/reflow/DSC06683.JPG" alt="" /></p>
</li>
<li>The Microcontroller Board
<p><img class="alignnone instruction" src="imgs/reflow/DSC06684.JPG" alt="" /></p>
</li>
</ol>
</p>
<p>Next, we will solder wires to the back of the boards to connect the boards together.</p>
</div>
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