Shared On/Off Entities Blueprint for HomeAssistant

shared-on-off-entities.yaml

blueprint:
  name: Shared On/Off State
  description: "# Shared On/Off State\n
    **v0.01**\n\n
    ## Disclaimer:\n
    This is my first attempt at writing a blueprint. Let me know if you have any feedback or edits I should make.\n
    ## Description:\n
    This automation shares the state of selected entities.\n
    If you turn On/Off any entity in this group, either through software or physically,
    every other entity in this group will share the same state.\n
    ## Example Usage:\n
    - 3-way switch (or more!)\n
    - Shared state On/Off groups\n
    ## Shout Out\n
    Special thanks to Petro for
    [his comment](https://community.home-assistant.io/t/emulate-a-three-way-switch/167863/9)
    from which I took heavy inspiration from. \n
    I was trying to emulate a 3-way switch and couldn't find any good examples until I stumbled upon his comment.
    I couldn't find any blueprints that worked as well as him comment, so I created one. Thanks Petro!\n
    "
  domain: automation
  input:
    switch_entities:
      name: Select the On/Off entities you'd like to share state.
      selector:
        entity:
          domain:
            - switch
            - fan
            - light
          multiple: true
mode: single
max_exceeded: silent
trigger:
  platform: state
  entity_id: !input switch_entities
  from: &states
    - "on"
    - "off"
  to: *states
variables:
  entities: !input switch_entities
  value: >
    {{ trigger.to_state.state }}
  targets: >
    {{ expand(entities) | rejectattr('entity_id','eq', trigger.entity_id) | selectattr('state','!=', value) | map(attribute='entity_id') | list }}
condition:
  - condition: template
    value_template: >
      {{ targets not in ([], none) }}
action:
  - service: homeassistant.turn_{{ value }}
    target:
      entity_id: "{{ targets }}"