The "scenes" of Home Assistant: what they are and how they work

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Scenes are a very convenient tool for defining the arbitrary conditions of one or more entity present in the profirst personal home automation based on Home Assistant.Home Assistant Official Logo

The scenes are defined by the configuration of theHUB and determine the creation of entities called "scene.nome_della_scena"; these entities, associated with the service "scene.turn_on“, Mean that the entities included in them assume the indicated status.

If, for example, we wanted to define a "good night" scene in which all the lights were turned off, it would be possible to do so through a scene in which we would indicate all the entities involved associated with the state "off". Performing "scene.turn_on"Associated with the entity" scenes. Goodnight ", all the lights (indicated) would go out in unison.

The interesting thing is that the scene type entities can be easily exposed to the smart speakers, thus allowing us to execute them through voice commands.

Nb Starting from the version 0.102.x of Home Assistant è stato aggiunto un comodo editor visuale per la definizione delle scene.

Example

Let's take an example of a scene:

scene:
  - name: TV
    entities:
      light.artemide: off
      light.angolo: off
      light.led_tv:
        state: true
        xy_color: [0.33, 0.66]
        brightness: 200

This scene, called "scene.tv", Causes the lights in the room ("light.artemide" and "light.angolo") Turn off and the light" light.led_tv "turns on: being a RGB light (like the controllers Magic Home, Or Philips HUE, for example), the default color and level are also set lumiof brilliance.

As easy to imagine, it is possible to define how many scenes you want.

Nb For a limitation proit is not possible to set - in the same scene - multiple states for the same entity. In case it is necessary to do this, it is more advisable to use a sequence through script.

How to evoke scenes

As anticipated, an excellent field of appThe scene speakers are the smart speakers, but not only.

also the automations di Home Assistant are a scope of applished here very typical: automatically performing a scene in the face of a specific condition (trivially, returning home) is particularly convenient.

To evoke a scene, the syntax in automation is very simple:

automation:
  alias: "Automazione scena"
  trigger: []
  condition: []
  action:
    service: scene.turn_on
    entity_id: scene.nomescena

According to trigger chosen, automation "automation.automazione_scena” provvede to perform the indicated scene (in the example, "scene.nomescena"


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