Notification when sensor is unavailable

ESPHome
1

Hi,

I am looking for help with two separate but related issues. I have a few battery-powered sensors that are programmed to go into a deep sleep for intervals of 1 hour, then wake up, measure and back to sleep. The battery lasts 1 to 2 months. I am trying to get a notification when they get unavailable. Here is the code that I am playing with;

- id: bath1-unavailable
  alias: "Notify bath1-unavailable"
  trigger:
  - platform: state
    entity_id: sensor.temp_bathroom_1
    to: unavailable
    for:
      hours: 2
  action:
    - service: notify.telegramnote
      data:
        title: 'HA warning!!!'
        message: "Sensor bath 1 is unavailable"

So first question, assuming that the code above works. Will HA be able to distinguish between a deep-sleep and unavailable\battery empty?

Second question, how to apply this code to all sensors, without having to copy-paste 10 times?

Thanks a million guys,

2

Is battery state being reported to HA as well?
What are the states reported to HA for those sensors?, check the history for the state changes.

- id: sensor-unavailable
  alias: "Notify Sensor Unavailable"
  trigger:
  - platform: state
    entity_id:
      - sensor.temp_01
      - sensor.temp_02
      - sensor.temp_03
    to: unavailable
    for:
      hours: 2
  action:
    - service: notify.telegramnote
      data:
        title: 'HA warning!!!'
        message:  >-
          "{{ trigger.to_state.attributes.friendly_name }} is unavailable"
3

Thanks @Coolie1101.

I have struugled to get battery voltage from my Mini d1. so I gave up. So no battery state on the device.

4

So, what are the states reported to HA for those sensors?

5

they keep reporting temperature. one went to state unknown and the temperature becomes constant. so an easy (?) solution would be to check if temperature remains constant for a certain period of time.

thanks for the help

6

FYI, Monitor your car battery in Home Assistant - #36 by laca75tn