gistfile1.yaml

blueprint:
  name: Two Light Sync
  description: >
    Complete bidirectional sync between two lights with brightness control and state matching.
  domain: automation

  input:
    switch_light:
      name: Switch Light
      description: The switch that appears as a light entity
      selector:
        entity:
          domain: light

    target_light:
      name: Target Light
      description: The light or light group to control
      selector:
        entity:
          domain: light
    
    transition_time:
      name: Transition Time
      description: Time in seconds for smooth transitions (0.0 to 2.0)
      default: 0.5
      selector:
        number:
          min: 0.0
          max: 2.0
          step: 0.1

mode: single

trigger:
  # Watch both state and brightness changes for switch
  - platform: state 
    entity_id: !input switch_light
  - platform: state 
    entity_id: !input switch_light
    attribute: brightness
  # Watch both for target light
  - platform: state
    entity_id: !input target_light
  - platform: state
    entity_id: !input target_light
    attribute: brightness

variables:
  switch_light: !input switch_light
  target_light: !input target_light
  transition_time: !input transition_time

action:
  - variables:
      is_switch_trigger: "{{ trigger.entity_id == switch_light }}"
      source_brightness: "{{ state_attr(trigger.entity_id, 'brightness') | default(0) }}"
      target_light_brightness: "{{ state_attr(target_light, 'brightness') | default(0) }}"
      
  - choose:
      # When switch changes
      - conditions:
          - condition: template
            value_template: "{{ is_switch_trigger }}"
        sequence:
          - choose:
              # Handle turning off (either by state or brightness)
              - conditions:
                  - condition: or
                    conditions:
                      - condition: template
                        value_template: "{{ states(switch_light) == 'off' }}"
                      - condition: template
                        value_template: "{{ source_brightness | int == 0 }}"
                sequence:
                  - service: light.turn_off
                    data:
                      entity_id: "{{ target_light }}"
                      transition: "{{ transition_time }}"

              # Handle turning on or brightness changes
              - conditions:
                  - condition: template
                    value_template: "{{ states(switch_light) == 'on' }}"
                sequence:
                  - service: light.turn_on
                    data:
                      entity_id: "{{ target_light }}"
                      brightness: "{{ source_brightness }}"
                      transition: "{{ transition_time }}"

      # When target light changes
      - conditions:
          - condition: template
            value_template: "{{ not is_switch_trigger }}"
        sequence:
          - choose:
              # When target light turns off
              - conditions:
                  - condition: template
                    value_template: "{{ states(target_light) == 'off' }}"
                sequence:
                  - delay:
                      milliseconds: 100
                  - service: light.turn_off
                    data:
                      entity_id: "{{ switch_light }}"
                      transition: "{{ transition_time }}"

              # When target light brightness changes
              - conditions:
                  - condition: template
                    value_template: "{{ states(target_light) == 'on' }}"
                  - condition: template
                    value_template: >
                      {{ target_light_brightness | int != 
                         state_attr(switch_light, 'brightness') | default(0) | int }}
                sequence:
                  - service: light.turn_on
                    data:
                      entity_id: "{{ switch_light }}"
                      brightness: "{{ target_light_brightness }}"
                      transition: "{{ transition_time }}"