Control two lights with one button

Configuration
2

I’m not 100% clear on what you want.

You want a smart switch to toggle the states of A and B such that, if A is on and you push the button, A turns off and B turns on.

This would also include A and B both on. In this case, only A would turn off and B would remain on.

Otherwise, you want it to turn on A and turn off B. So if both lights are off, it will only turn on A. If only B is on, it will turn off B and turn on A.

- alias: Toggle Lights
  trigger:
    platform: state
    entity_id: switch.my_switch
  action:
    # Need to do 2 actions. One for A and one for B. 
    # First, turn on or off A depending on the state of A. 
    # This might turn A off if it was already off. Oh well, nothing bad will happen.
    # We can't have an empty service, so we have to call SOMETHING no matter what. 
    # So turn the light off if it's off it is.
    - service_template: "light.turn_{{ 'off' if is_state('light.lightA', 'on') else 'on' }}"
      entity_id: light.lightA
    # Now control light B. It strictly follows light A (which has already been handled).
    # Thus, if light A is off, this must turn on. 
    # Otherwise, if light A is on, this must turn off. 
    - service_template: "light.turn_{{ 'on' if is_state('light.lightA', 'off') else 'on' }}"
      entity_id: light.lightB

That automation will do exactly as you asked.

But, to control 2 lights with one button…that could mean something else.

Specially, scroll down to the examples. You can have one switch control 2 lights, copycat, mirror, etc.

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