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+---
+layout: page
+title: "Service Calls"
+description: "Instructions how to call services in Home Assistant."
+date: 2016-03-12 12:00 -0800
+sidebar: false
+comments: false
+sharing: true
+footer: true
+---
+
+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.
+
+The configuration options to call a config are the same between all components and are described on this page.
+
+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 class='note'>
+Use the service developer tool in the frontend to discover available services.
+</p>
+
+### {% linkable_title The basics %}
+
+Call the service `homeassistant.turn_on` on the entity `group.living_room`. This will turn all members of `group.living_room` on. You can also omit `entity_id` and it will turn on all possible entities.
+
+```yaml
+automation:
+- trigger:
+    platform: sun
+    event: sunset
+  action:
+    service: homeassistant.turn_on
+    entity_id: group.living_room
+```
+
+### {% linkable_title Passing data to the service call %}
+
+You can also specify other parameters beside the entity to target. For example, the light turn on service allows specifying the brightness.
+
+```yaml
+automation:
+- trigger:
+    platform: sun
+    event: sunset
+  action:
+    service: light.turn_on
+    entity_id: group.living_room
+    data:
+      brightness: 120
+      rgb_color: [255, 0, 0]
+```
+
+### {% linkable_title Use templates to decide which service to call %}
+
+You can use [templating] support to dynamically choose which service to call. For example, you can call a certain service based on if a light is on.
+
+```yaml
+automation:
+- trigger:
+    platform: sun
+    event: sunset
+  action:
+    service_template: >
+      {% raw %}{% if states.sensor.temperature | float > 15 %}
+        switch.turn_on
+      {% else %}
+        switch.turn_off
+      {% endif %}{% endraw %}
+    entity_id: switch.ac
+```
+
+### {% linkable_title Use templates to determine the attributes %}
+
+Templates can also be used for the data that you pass to the service call.
+
+```yaml
+automation:
+- trigger:
+    platform: sun
+    event: sunset
+  action:
+    service_template: thermostat.set_temperature
+    data_template:
+      entity_id: >
+        {% raw %}{% if is_state('device_tracker.paulus', 'home') %}
+          thermostat.upstairs
+        {% else %}
+          thermostat.downstairs
+        {% endif %}{% endraw %}
+      temperature: {% raw %}{{ 22 - distance(states.device_tracker.paulus) }}{% endraw %}
+```
+
+[templating]: /topics/templating/