I’m trying to make a rapid light flashing automation. The behavior is intended to be 2 quick flashes and remain at the initial state when done. I got it mostly working with discrete switch.turn_on and switch.turn_off actions with wait_template between the actions to ensure the state is reached before the next action, however it only works properly if the light is initially off. If the initial state is on, then it only flashes once and leaves the light off when done.
I believe switch.toggle would better account for the initial and final states with the correct number of flashes, except I can’t figure out how the wait_template can know the initial state for comparison.
Note 1:
The entity being flashed is not the triggering entity for the automation, so I can’t use the trigger variable in the templating.
Note 2:
Using switch.toggle with delay: 0:00:01 works without having to know the initial state, but it’s far too slow for my purpose.
My first thought was to capture the initial state as a variable that all the wait_template actions would be able to compare to, but I have been searching all day how to create that variable in the automation without any luck.
My second thought was to use a script to do the toggle/wait and pass the desired entity and its starting state to the script. That basically reverses the problem because now I have the initial state value, but I haven’t figured out how to successfully pass an entity from the automation to the script and then use it in the toggle and wait actions. Again, searching for hours and not finding any examples that pass an entity to a script.
Examples of my attempts below. Does anyone know how to get the desired behavior?
Incidentally, if anyone knows how to do a loop for n times, that would be handy to know. I couldn’t find anything on that either.
Example 1: my first working automation (incorrect behavior if initially on)
# This automation works great if the light is initially off, but only flashes
# once and leaves the light in the wrong final state if initially on.
- id: example1_automation
trigger:
platform: state
entity_id: input_boolean.var1
action:
- service: switch.turn_on
entity_id: switch.office_neon
- wait_template: "{{ is_state('switch.office_neon', 'on') }}"
- service: switch.turn_off
entity_id: switch.office_neon
- wait_template: "{{ is_state('switch.office_neon', 'off') }}"
- service: switch.turn_on
entity_id: switch.office_neon
- wait_template: "{{ is_state('switch.office_neon', 'on') }}"
- service: switch.turn_off
entity_id: switch.office_neon
- wait_template: "{{ is_state('switch.office_neon', 'off') }}"
If I change all services to switch.toggle, the wait_template needs to be conditional based on the initial state of the switch. I have not been able to figure out how to capture the initial state of the switch for each action to compare to.
Example 2: passing entity and initial state to script (broken)
- id: example1_automation
trigger:
platform: state
entity_id: input_boolean.var1
action:
- service: script.turn_on
entity_id: script.flash_entity
data_template:
variables:
enttiy_id: "{{ switch.office_neon }}"
start_state: "{{ states('switch.office_neon') }}"
# The script has this error in the logs:
# Error rendering data template: UndefinedError: 'switch' is undefined
script:
flash_entity:
alias: Flash Entity
description: 'Turns an entity on and off repeatedly'
fields:
entity_id:
description: "The entity ID"
example: 'switch.office_neon'
start_state:
description: "The initial state of the entity so we can toggle appropriately"
example: 'on'
sequence:
- service: switch.toggle
data_template:
entity_id: "{{ entity_id }}"
- wait_template: "{{ states( entity_id ) != start_state }}"
- service: switch.toggle
data_template:
entity_id: "{{ entity_id }}"
- wait_template: "{{ states( entity_id ) == start_state }}"
- service: switch.toggle
data_template:
entity_id: "{{ entity_id }}"
- wait_template: "{{ states( entity_id ) != start_state }}"
- service: switch.toggle
data_template:
entity_id: "{{ entity_id }}"
- wait_template: "{{ states( entity_id ) == start_state }}"
I can’t seem to handle passing the entity correctly. I have tried a few things, such as passing {{ switch.office_neon.unique_id }}, but that gets the same error: “switch is undefined”.
).
