Merge pull request #100 from tomduijf/cb_media_light

Cookbook: Dim lights when playing media

source/cookbook/dim_lights_when_playing_media.markdown

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+---
+layout: page
+title: "Dim lights when playing media"
+description: "Dim lights up or down when playing media"
+date: 2015-10-15 19:05
+sidebar: false
+comments: false
+sharing: true
+footer: true
+---
+
+Like it how the lights dim up/down at the movies? Do it at home as well!
+
+This example uses the media player, Philips Hue (transitions) and the sun component.
+We'll use actions to detect media player state changes and scenes to control multiple
+lights, color settings and transition between scenes.
+
+#### Scenes
+One scene for normal light, one for when movies are on.
+A 2 second transition gives a nice 'feel' to the switch.
+
+```yaml
+scene:
+  - name: Livingroom normal
+    entities:
+        light.light1:
+            state: on
+            transition: 2
+            brightness: 150
+            xy_color: [ 0.4448, 0.4066 ]
+        light.light2:
+            state: on
+            transition: 2
+            brightness: 215
+            xy_color: [ 0.4448, 0.4066 ]
+  - name: Livingroom dim
+    entities:
+        light.light1:
+            state: on
+            transition: 2
+            brightness: 75
+            xy_color: [ 0.5926, 0.3814 ]
+        light.light2:
+            state: on
+            transition: 2
+            brightness: 145
+            xy_color: [ 0.5529, 0.4107 ]
+```
+
+
+#### Automation
+The paused/stopped state is best matched using "from: 'playing'".
+Adding in the sun condition as we only want this when it's dark.
+
+```yaml
+automation:
+  - action: "Media player paused/stopped"
+    trigger:
+      - platform: state
+        entity_id: media_player.htpc
+        from: 'playing'
+    condition:
+      - platform: sun
+        entity_id: sun.sun
+        state: 'below_horizon'
+    action:
+        service: scene.turn_on
+        entity_id: scene.livingroom_normal
+
+  - alias: "Media player playing"
+    trigger:
+      - platform: state
+        entity_id: media_player.htpc
+        to: 'playing'
+    condition:
+      - platform: sun
+        entity_id: sun.sun
+        state: 'below_horizon'
+    action:
+        service: scene.turn_on
+        entity_id: scene.livingroom_dim
+```
+