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Service Calls
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<p>Various components allow calling services when a certain event occurs. The most common one is calling a service when an automation trigger happens. But a service can also be called from a script or via the Amazon Echo.</p>
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<p>The configuration options to call a config are the same between all components and are described on this page.</p>
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<p>Examples on this page will be given as part of an automation component configuration but different approaches can be used for other components too.</p>
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<p class="note">
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Use the <img src="/images/screenshots/developer-tool-services-icon.png" class="no-shadow" height="38" /> service developer tool in the frontend to discover available services.
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</p>
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<h3><a class="title-link" name="the-basics" href="#the-basics"></a> The basics</h3>
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<p>Call the service <code class="highlighter-rouge">homeassistant.turn_on</code> on the entity <code class="highlighter-rouge">group.living_room</code>. This will turn all members of <code class="highlighter-rouge">group.living_room</code> on. You can also omit <code class="highlighter-rouge">entity_id</code> and it will turn on all possible entities.</p>
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<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">service</span><span class="pi">:</span> <span class="s">homeassistant.turn_on</span>
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<span class="s">entity_id</span><span class="pi">:</span> <span class="s">group.living_room</span>
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</code></pre>
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</div>
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<h3><a class="title-link" name="passing-data-to-the-service-call" href="#passing-data-to-the-service-call"></a> Passing data to the service call</h3>
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<p>You can also specify other parameters beside the entity to target. For example, the light turn on service allows specifying the brightness.</p>
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<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">service</span><span class="pi">:</span> <span class="s">light.turn_on</span>
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<span class="s">entity_id</span><span class="pi">:</span> <span class="s">group.living_room</span>
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<span class="s">data</span><span class="pi">:</span>
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<span class="s">brightness</span><span class="pi">:</span> <span class="s">120</span>
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<span class="s">rgb_color</span><span class="pi">:</span> <span class="pi">[</span><span class="nv">255</span><span class="pi">,</span> <span class="nv">0</span><span class="pi">,</span> <span class="nv">0</span><span class="pi">]</span>
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</code></pre>
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</div>
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<h3><a class="title-link" name="use-templates-to-decide-which-service-to-call" href="#use-templates-to-decide-which-service-to-call"></a> Use templates to decide which service to call</h3>
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<p>You can use <a href="/topics/templating/">templating</a> support to dynamically choose which service to call. For example, you can call a certain service based on if a light is on.</p>
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<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">service_template</span><span class="pi">:</span> <span class="pi">></span>
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<span class="no">{% if states.sensor.temperature | float > 15 %}</span>
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<span class="no">switch.turn_on</span>
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<span class="no">{% else %}</span>
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<span class="no">switch.turn_off</span>
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<span class="no">{% endif %}</span>
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<span class="s">entity_id</span><span class="pi">:</span> <span class="s">switch.ac</span>
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</code></pre>
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</div>
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<h3><a class="title-link" name="using-the-services-developer-tool" href="#using-the-services-developer-tool"></a> Using the Services Developer Tool</h3>
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<p>You can use the Services Developer Tool to test data to pass in a service call.
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For example, you may test turning on or off a ‘group’ (See [groups] for more info)</p>
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<p>To turn a group on or off, pass the following info:
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Domain: <code class="highlighter-rouge">homeassistant</code>
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Service: <code class="highlighter-rouge">turn_on</code>
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Service Data: <code class="highlighter-rouge"><span class="p">{</span><span class="w"> </span><span class="nt">"entity_id"</span><span class="p">:</span><span class="w"> </span><span class="s2">"group.kitchen"</span><span class="w"> </span><span class="p">}</span></code></p>
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<h3><a class="title-link" name="use-templates-to-determine-the-attributes" href="#use-templates-to-determine-the-attributes"></a> Use templates to determine the attributes</h3>
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<p>Templates can also be used for the data that you pass to the service call.</p>
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<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">service</span><span class="pi">:</span> <span class="s">thermostat.set_temperature</span>
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<span class="s">data_template</span><span class="pi">:</span>
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<span class="s">entity_id</span><span class="pi">:</span> <span class="pi">></span>
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<span class="no">{% if is_state('device_tracker.paulus', 'home') %}</span>
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<span class="no">thermostat.upstairs</span>
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<span class="no">{% else %}</span>
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<span class="no">thermostat.downstairs</span>
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<span class="no">{% endif %}</span>
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<span class="s">temperature</span><span class="pi">:</span> <span class="pi">{{</span> <span class="nv">22 - distance(states.device_tracker.paulus)</span> <span class="pi">}}</span>
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</code></pre>
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