Change state of button card based on a sensor

@Venice wrote:

Hi,

I build a Dashboard for my media control.
I use the Harmony Hub with activities to control my devices.
It works very well, but what I am missing is to show the current state via a button.

As you can see on my screenshot, I have several buttons which trigger an activity on my harmony hub. For example Spotify.

  - entity: remote.wohnzimmer
    icon: 'mdi:spotify'
    icon_height: 32px
    name: Spotify
    show_icon: true
    show_name: true
    tap_action:
      action: call-service
      service: remote.turn_on
      service_data:
        activity: 36772906
        entity_id: remote.wohnzimmer
    theme: Backend-selected
    type: entity-button 

I want to change the color of the button if the activity is active.
I was only able to include the activity in the picture card with a template sensor.

I would be very happy if someone could help me

Tobias

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