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Site updated at 2017-09-23 06:14:30 UTC

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docs/ecosystem/appdaemon/index.html
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<p>The best way to show what AppDaemon does is through a few simple examples.</p>
<h2>Sunrise/Sunset Lighting</h2>
<p>Let’s start with a simple App to turn a light on every night at sunset and off every morning at sunrise. Every App when first started will have its <code class="highlighter-rouge">initialize()</code> function called, which gives it a chance to register a callback for AppDaemons’s scheduler for a specific time. In this case, we are using <code class="highlighter-rouge">run_at_sunrise()</code> and <code class="highlighter-rouge">run_at_sunset()</code> to register two separate callbacks. The argument <code class="highlighter-rouge">0</code> is the number of seconds offset from sunrise or sunset and can be negative or positive. For complex intervals, it can be convenient to use Python’s <code class="highlighter-rouge">datetime.timedelta</code> class for calculations. When sunrise or sunset occurs, the appropriate callback function, <code class="highlighter-rouge">sunrise_cb()</code> or <code class="highlighter-rouge">sunset_cb()</code>, is called, which then makes a call to Home Assistant to turn the porch light on or off by activating a scene. The variables <code class="highlighter-rouge">args["on_scene"]</code> and <code class="highlighter-rouge">args["off_scene"]</code> are passed through from the configuration of this particular App, and the same code could be reused to activate completely different scenes in a different version of the App.</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>
<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="kn">import</span> <span class="nn">appdaemon.appapi</span> <span class="kn">as</span> <span class="nn">appapi</span>
<span class="k">class</span> <span class="nc">OutsideLights</span><span class="p">(</span><span class="n">appapi</span><span class="o">.</span><span class="n">AppDaemon</span><span class="p">):</span>