Inspired by this:
I created a new blueprint that will synchronize the on-off state and brightness of two lights. Note that if one of the lights becomes unavailable, the other one will turn off. This is a good default for me, but it might not suit your use case.
Would be easy to extend to synchronizing other features as well, but these are the ones that I actually use.
name: Synchronize brightness states
description: Synchronize the on/off state of 2 entities
domain: automation
input:
entity_1:
name: First entity
selector:
entity: {}
entity_2:
name: Second entity
selector:
entity: {}
source_url: https://gist.github.com/fireboy1919/997c80db37de30da76f67c5daeaba27b
mode: restart
max_exceeded: silent
variables:
entity_1: !input entity_1
entity_2: !input entity_2
trigger:
- platform: state
entity_id: !input entity_1
- platform: state
entity_id: !input entity_1
attribute: brightness
- platform: state
entity_id: !input entity_2
- platform: state
entity_id: !input entity_2
attribute: brightness
condition: []
action:
- choose:
- conditions:
condition: template
value_template: "{{ is_state(trigger.to_state.entity_id, 'on') }}"
sequence:
- service: light.turn_on
data:
brightness: '{{ state_attr(trigger.to_state.entity_id, "brightness") }}'
entity_id: '{% if trigger.from_state.entity_id == entity_1 %} {{ entity_2 }} {% else %} {{ entity_1 }} {% endif %}'
default:
- service: light.turn_off
target:
entity_id: '{% if trigger.from_state.entity_id == entity_1 %} {{ entity_2 }} {% else %} {{ entity_1 }} {% endif %}'
