Trigger on Washing Machine finish

Configuration
3

Im sure there are better ways but here is how I solved it:

First I created a sensor:

  - platform: template
    sensors:
      washing_maching_is_running:
        friendly_name: Washing Machine Is Running
        value_template: >-
          {% if states('sensor.washing_machine_power_switch_power')|float > 3 %}
            true
          {% else %}
            false
          {% endif %}

And the automation to notify:

- id: notify_wash_cycle_completed
  alias: Notify Wash Cycle Completed
  trigger:
    - entity_id: sensor.washing_maching_is_running
      platform: state
      to: 'false'
      for:
        minutes: 3
  action:
    service: script.set_washing_machine_alert

The waiting 3 mins solves the problem of getting false negatives when the power drops between cycles.

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