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Site updated at 2017-11-18 20:42:08 UTC

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<h2><a class="title-link" name="directions-for-installing-smbus-support-on-raspberry-pi" href="#directions-for-installing-smbus-support-on-raspberry-pi"></a> Directions for installing smbus support on Raspberry Pi</h2>
<p>Enable I2c interface with the Raspberry Pi configuration utility:</p>
<div class="language-bash highlighter-rouge"><pre class="highlight"><code><span class="c"># pi user environment: Enable i2c interface</span>
<span class="gp">$ </span>sudo raspi-config
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<p>Select <code class="highlighter-rouge">Interfacing options-&gt;I2C</code> choose <code class="highlighter-rouge">&lt;Yes&gt;</code> and hit <code class="highlighter-rouge">Enter</code>, then go to <code class="highlighter-rouge">Finish</code>.</p>
<p>Install dependencies for use the <code class="highlighter-rouge">smbus-cffi</code> module and enable your <em>homeassistant</em> user to join the <em>i2c</em> group:</p>
<div class="language-bash highlighter-rouge"><pre class="highlight"><code><span class="c"># pi user environment: Install i2c dependencies and utilities</span>
<span class="gp">$ </span>sudo apt-get install build-essential libi2c-dev i2c-tools python-dev libffi-dev
<span class="c"># pi user environment: Add homeassistant user to the i2c group</span>
<span class="gp">$ </span>sudo usermod -a -G i2c homeassistant
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<h3><a class="title-link" name="check-the-i2c-address-of-the-sensor" href="#check-the-i2c-address-of-the-sensor"></a> Check the i2c address of the sensor</h3>
<p>After installing <code class="highlighter-rouge">i2c-tools</code>, a new utility is available to scan the addresses of the connected sensors, so you can see the sensor address:</p>
<div class="language-bash highlighter-rouge"><pre class="highlight"><code><span class="gp">$ </span>/usr/sbin/i2cdetect -y 1
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<p>It will output a table like this:</p>
<div class="language-text highlighter-rouge"><pre class="highlight"><code> 0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- 23 -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: 40 -- -- -- -- -- UU -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- 77
</code></pre>
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<p>For more details about the <code class="highlighter-rouge">raspihats</code> add-on boards for Raspberry PI, visit <a href="http://www.raspihats.com/">raspihats.com</a>.</p>
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