Scenes

A scene entity is an entity that can restore the state of a group of entities. Scenes can be user-defined or can be provided through an integration.

The state of a scene

The scene entity is stateless, as in, it cannot have a state like the on or off state that, for example, a normal switch entity has.

Every scene entity does keep track of the timestamp of when the last time the scene entity was called via the Home Assistant UI or called via a service call.

Scenes created by integrations

Some integrations like Philips Hue, MQTT, and KNX provide scenes. You can activate them from the Home Assistant UI or via as service calls. In this case, the integration provides the preferred states to restore.

Creating a scene

You can create scenes that capture the states you want certain entities to be. For example, a scene can specify that light A should be turned on and light B should be bright red.

Scenes can be created and managed via the user interface using the Scene Editor. They can also be manually configured via configuration.yaml. Note that the entity data is not service call parameters, it’s a representation of the wanted state:

# Example configuration.yaml entry
scene:
  - name: Romantic
    icon: "mdi:flower-tulip"
    entities:
      light.tv_back_light: "on"
      light.ceiling:
        state: "on"
        brightness: 200
        color_mode: "xy"
        xy_color: [0.33, 0.66]
  - name: Movies
    entities:
      light.tv_back_light:
        state: "on"
        brightness: 125
      light.ceiling: "off"
      media_player.sony_bravia_tv:
        state: "on"
        source: HDMI 1
  - name: Standard
    entities:
      light.tv_back_light:
        state: "off"
      light.ceiling:
        state: "on"
        brightness: 125
        color_mode: "white"

As you can see, there are two ways to define the states of each entity_id:

• Define the state directly with the entity. Be aware, that state needs to be defined.
• Define a complex state with its attributes. You can see all attributes available for a particular entity under developer-tools -> state.

Scenes can be activated using the service scene.turn_on (there is no ‘scene.turn_off’ service).

# Example automation
automation:
  trigger:
    platform: state
    entity_id: device_tracker.sweetheart
    from: "not_home"
    to: "home"
  action:
    service: scene.turn_on
    target:
      entity_id: scene.romantic

Applying a scene without defining it

With the scene.apply service you are able to apply a scene without first defining it via configuration. Instead, you pass the states as part of the service data. The format of the data is the same as the entities field in a configuration.

# Example automation
automation:
  trigger:
    platform: state
    entity_id: device_tracker.sweetheart
    from: "not_home"
    to: "home"
  action:
    service: scene.apply
    data:
      entities:
        light.tv_back_light:
          state: "on"
          brightness: 100
        light.ceiling: off
        media_player.sony_bravia_tv:
          state: "on"
          source: HDMI 1

Using scene transitions

Both the scene.apply and scene.turn_on services support setting a transition, which enables you to smoothen the transition to the scene.

This is an example of an automation that sets a romantic scene, in which the light will transition to the scene in 2.5 seconds.

# Example automation
automation:
  trigger:
    platform: state
    entity_id: device_tracker.sweetheart
    from: "not_home"
    to: "home"
  action:
    service: scene.turn_on
    target:
      entity_id: scene.romantic
    data:
      transition: 2.5

Transitions are currently only support by lights, which in their turn, have to support it as well. However, the scene itself does not have to consist of only lights to have a transition set.

Reloading scenes

Whenever you make a change to your scene configuration, you can call the scene.reload service to reload the scenes.

Creating scenes on the fly

Create a new scene without having to configure it by calling the scene.create service. This scene will be discarded after reloading the configuration.

You need to pass a scene_id in lowercase and with underscores instead of spaces. You also may want to specify the entities in the same format as when configuring the scene. You can also take a snapshot of the current state by using the snapshot_entities parameter. In this case, you have to specify the entity_id of all entities you want to take a snapshot of. entities and snapshot_entities can be combined but you have to use at least one of them.

If the scene was previously created by scene.create, it will be overwritten. If the scene was created by YAML, nothing happens but a warning in your log files.

Video Tutorial

This video tutorial explains how scenes work and how you can utilize scenes on the fly.

# Example automation using entities
automation:
  trigger:
    platform: homeassistant
    event: start
  action:
    service: scene.create
    data:
      scene_id: my_scene
      entities:
        light.tv_back_light:
          state: "on"
          brightness: 100
        light.ceiling: off
        media_player.sony_bravia_tv:
          state: "on"
          source: HDMI 1

The following example turns off some entities as soon as a window opens. The states of the entities are restored after the window is closed again.

# Example automation using snapshot
- alias: "Window opened"
  trigger:
  - platform: state
    entity_id: binary_sensor.window
    from: "off"
    to: "on"
  condition: []
  action:
  - service: scene.create
    data:
      scene_id: before
      snapshot_entities:
      - climate.ecobee
      - light.ceiling_lights
  - service: light.turn_off
    target:
      entity_id: light.ceiling_lights
  - service: climate.set_hvac_mode
    target:
      entity_id: climate.ecobee
    data:
      hvac_mode: "off"
- alias: "Window closed"
  trigger:
  - platform: state
    entity_id: binary_sensor.window
    from: "on"
    to: "off"
  condition: []
  action:
  - service: scene.turn_on
    target:
      entity_id: scene.before