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Site updated at 2017-10-13 10:23:27 UTC

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<p>This is also fairly easy to achieve with Home Assistant automations, but we are just getting started.</p>
<h2>Motion Light</h2>
<p>Our next example is to turn on a light when motion is detected and it is dark, and turn it off after a period of time. This time, the <code class="highlighter-rouge">initialize()</code> function registers a callback on a state change (of the motion sensor) rather than a specific time. We tell AppDaemon that we are only interested in state changes where the motion detector comes on by adding an additional parameter to the callback registration - <code class="highlighter-rouge">new = "on"</code>. When the motion is detected, the callack function <code class="highlighter-rouge">motion()</code> is called, and we check whether or not the sun has set using a built-in convenience function: <code class="highlighter-rouge">sun_down()</code>. Next, we turn the light on with <code class="highlighter-rouge">turn_on()</code>, then set a timer using <code class="highlighter-rouge">run_in()</code> to turn the light off after 60 seconds, which is another call to the scheduler to execute in a set time from now, which results in <code class="highlighter-rouge">AppDaemon</code> calling <code class="highlighter-rouge">light_off()</code> 60 seconds later using the <code class="highlighter-rouge">turn_off()</code> call to actually turn the light off. This is still pretty simple in code terms:</p>
<p>Our next example is to turn on a light when motion is detected and it is dark, and turn it off after a period of time. This time, the <code class="highlighter-rouge">initialize()</code> function registers a callback on a state change (of the motion sensor) rather than a specific time. We tell AppDaemon that we are only interested in state changes where the motion detector comes on by adding an additional parameter to the callback registration - <code class="highlighter-rouge">new = "on"</code>. When the motion is detected, the callback function <code class="highlighter-rouge">motion()</code> is called, and we check whether or not the sun has set using a built-in convenience function: <code class="highlighter-rouge">sun_down()</code>. Next, we turn the light on with <code class="highlighter-rouge">turn_on()</code>, then set a timer using <code class="highlighter-rouge">run_in()</code> to turn the light off after 60 seconds, which is another call to the scheduler to execute in a set time from now, which results in <code class="highlighter-rouge">AppDaemon</code> calling <code class="highlighter-rouge">light_off()</code> 60 seconds later using the <code class="highlighter-rouge">turn_off()</code> call to actually turn the light off. This is still pretty simple in code terms:</p>
<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="kn">import</span> <span class="nn">homeassistant.appapi</span> <span class="kn">as</span> <span class="nn">appapi</span>
<span class="k">class</span> <span class="nc">FlashyMotionLights</span><span class="p">(</span><span class="n">appapi</span><span class="o">.</span><span class="n">AppDaemon</span><span class="p">):</span>