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<p class="caption" role="heading"><span class="caption-text">Build:</span></p>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">Tallies Overview</a><ul>
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<section id="tallies-overview">
<h1>Tallies Overview<a class="headerlink" href="#tallies-overview" title="Permalink to this heading"></a></h1>
<p>This page gives a short overview of how the tallies work in relation to the camera’s. A simple overview of the tallies in correlation between the server and the streamer is shown below:</p>
<img alt="_images/overview.svg" class="drawio" src="_images/overview.svg" /><section id="hardware">
<h2>Hardware<a class="headerlink" href="#hardware" title="Permalink to this heading"></a></h2>
<p>The hardware for the tallies is an <code class="docutils literal notranslate"><span class="pre">esp8266</span></code> microcontroller, as they can be found <a class="reference external" href="https://www.amazon.nl/Diymore-ESP8266-WiFi-ontwikkelingskaart-NodeMCU-ESP-12E-module/dp/B09Z6T2XS4/ref=sr_1_2_sspa?__mk_nl_NL=%C3%85M%C3%85%C5%BD%C3%95%C3%91&amp;crid=3DHTKU7SQKET9&amp;keywords=esp8266&amp;qid=1674509572&amp;sprefix=esp8266%2Caps%2C135&amp;sr=8-2-spons&amp;sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&amp;psc=1">on Amazon</a>.
These microcontrollers are very cheap but are capable of using the <code class="docutils literal notranslate"><span class="pre">802.11</span> <span class="pre">b/g/n</span></code> wifi standard(<code class="docutils literal notranslate"><span class="pre">IEEE</span></code>).</p>
<p>A quick overview of the hardware:</p>
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Type</p></th>
<th class="head"><p>Value</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>CPU</p></td>
<td><p>32Bit RISC based on <code class="docutils literal notranslate"><span class="pre">Xtensa</span> <span class="pre">lx106</span></code></p></td>
</tr>
<tr class="row-odd"><td><p>Instruction RAM</p></td>
<td><p>32 KiB</p></td>
</tr>
<tr class="row-even"><td><p>Instruction Cache</p></td>
<td><p>32 KiB</p></td>
</tr>
<tr class="row-odd"><td><p>User Data RAM</p></td>
<td><p>80 KiB</p></td>
</tr>
<tr class="row-even"><td><p>System Data RAM</p></td>
<td><p>16 KiB</p></td>
</tr>
<tr class="row-odd"><td><p>Flash Memory (External)</p></td>
<td><p>4 MiB</p></td>
</tr>
</tbody>
</table>
<p>Of the 17 GPIO pins available, only 3 are used for the RGB colouring.
Wifi is used for communication between the tallies and a server that will tell the tally to turn on the lights.</p>
</section>
<section id="software">
<h2>Software<a class="headerlink" href="#software" title="Permalink to this heading"></a></h2>
<p>On the Host a <code class="docutils literal notranslate"><span class="pre">NodeJS</span></code> server is run that opens a websocket on port <code class="docutils literal notranslate"><span class="pre">7411</span></code>.
This websockets waits for tallies to connect and sends data to them when connected.
The server also connects to the streamer, in our case a <code class="docutils literal notranslate"><span class="pre">Black</span> <span class="pre">Magic</span> <span class="pre">ATEM</span></code> that controls the camera’s.
The streamer gives information about which camera is active which is passed to the tallies.</p>
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