power_supply_notify.yaml

#
# Check if Raspberry Pi's power supply is providing enough energy
#
# @subscribe sensor.rpi_power_status
#
- id: power_supply_notify
  alias: "Power Supply NOTIFY"

  trigger:
    # When supplied power is out of spec.
    - platform: numeric_state
      entity_id: sensor.rpi_power_status
      above: 0

  action:
    # Pin a warning message in the frontend.
    - service: persistent_notification.create
      data:
        notification_id: power_supply
      data_template:
        title: "Raspbery Pi power issue"
        message: >-
          {% set description = state_attr('sensor.rpi_power_status', 'description') %}
          {% set status = states('sensor.rpi_power_status') %}

          {{ description }} (Code {{ status }})

    # Warn someone by text to take action.
    - service: notify.text
      data_template:
        title: "Raspbery Pi power issue"
        message: >-
          {% set description = state_attr('sensor.rpi_power_status', 'description') %}
          {% set status = states('sensor.rpi_power_status') %}

          {{ description }} (Code {{ status }})