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Site updated at 2016-12-06 08:11:16 UTC

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Arduino
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<p>The <a href="https://www.arduino.cc/">Arduino</a> device family are microcontroller boards that are often based on the ATmega328 chip. They come with digital input/output pins (some can be used as PWM outputs), analog inputs, and a USB connection. The equipment depends on the <a href="https://www.arduino.cc/en/Main/Products">type</a> of board. The most common ones are the Arduino Uno and the Arduino Leonardo with 14 digital input/output pins and 6 analog input pins.</p>
<p>There are a lot of extensions (so called <a href="https://www.arduino.cc/en/Main/ArduinoShields">shields</a>) available. Those shields can be plugged-in into the existing connectors and stacked on top of each other. This makes it possible to expand the capabilities of the Arduino boards.</p>
<p>The <code class="highlighter-rouge">arduino</code> component is designed to let you use a directly attached board to your Home Assistant host over USB.</p>
<p>You need to have the <a href="https://github.com/firmata/">Firmata firmware</a> on your board. Please upload the <code class="highlighter-rouge">StandardFirmata</code> sketch to your board, please refer to the <a href="https://www.arduino.cc/en/Main/Howto">Arduino documentation</a> for further information.</p>
<p>To integrate an Arduino boards with Home Assistant, add the following section to your <code class="highlighter-rouge">configuration.yaml</code> file:</p>
<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="c1"># Example configuration.yaml entry</span>
<span class="s">arduino</span><span class="pi">:</span>
<span class="s">port</span><span class="pi">:</span> <span class="s">/dev/ttyACM0</span>
</code></pre>
</div>
<p>Configuration variables:</p>
<ul>
<li><strong>port</strong> (<em>Required</em>): The port where your board is connected to your Home Assistant host. If you are using an original Arduino the port will be named <code class="highlighter-rouge">ttyACM*</code> otherwise <code class="highlighter-rouge">ttyUSB*</code>.</li>
</ul>
<p>The exact number can be determined with the command shown below.</p>
<div class="language-bash highlighter-rouge"><pre class="highlight"><code><span class="gp">$ </span>ls /dev/ttyACM<span class="k">*</span>
</code></pre>
</div>
<p>If that’s not working, check your <code class="highlighter-rouge">dmesg</code> or <code class="highlighter-rouge">journalctl -f</code> output. Keep in mind that Arduino clones are often using a different name for the port (eg. <code class="highlighter-rouge">/dev/ttyUSB*</code>).</p>
<p class="note warning">
A word of caution: The Arduino boards are not storing states. This means that with every initialization the pins are set to off/low.
</p>
<p>Add the user who is used to run Home Assistant to the groups to allow access to the serial port.</p>
<div class="language-bash highlighter-rouge"><pre class="highlight"><code>sudo usermod -a -G dialout,lock <span class="nv">$USER</span>
</code></pre>
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Introduced in release: pre 0.7
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<h1 class='title delta'>Related components</h1>
<ul class='divided'>
<li><a href='/components/sensor.arduino/'>
Arduino Sensor
</a></li>
<li><a href='/components/switch.arduino/'>
Arduino Switch
</a></li>
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<h1 class="title delta">Category DIY</h1>
<ul class='divided'>
<li>
Arduino
</li>
<li>
<a href='/components/sensor.arduino/'>Arduino Sensor</a>
</li>
<li>
<a href='/components/switch.arduino/'>Arduino Switch</a>
</li>
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<a href='/components/sensor.dht/'>DHT Sensor</a>
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<a href='/components/knx/'>KNX</a>
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<a href='/components/sensor.knx/'>KNX Sensor</a>
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<a href='/components/switch.knx/'>KNX Switch</a>
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<a href='/components/climate.knx/'>KNX Thermostat</a>
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<a href='/components/sensor.miflora/'>Mi Flora plant sensor</a>
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<a href='/components/sensor.serial_pm/'>Particulate matter Sensor</a>
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<a href='/components/rpi_gpio/'>Raspberry PI GPIO</a>
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<a href='/components/zigbee/'>ZigBee</a>
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