How many days has an entity been in the same state

Configuration
1

Hi guys, I’ve been trying all day to create a sensor that tells me how many days an entity has been in the same state. Specifically, I want it for my rain sensor to know how many days it hasn’t rained.
I have also tried to create a sensor that tells me the date of the last day that it rained and I can’t do it either. I’ve been searching the forum and can’t find anything that works for me. Could someone help me please?

2

There used to be a way to do it using the HIstory Stats integration, but it stopped working around June last year and, AFAIK, is still broken/bugged. Currrently, one way to do it is to use two template sensors.

template:
  - trigger:
      - platform: state
        entity_id: binary_sensor.rain_detector
        to: 'off'
        from: 'on'
    sensor:
      - name: End of Last Rain
        state: >
          {{ now() }}
  - sensor:
      - name: Days Since Last Rain
        state: >
          {% if is_state('binary_sensor.rain_detector', 'on') %}
            0
          {% else %}
            {{ (now() - states('sensor.end_of_last_rain') | as_datetime).days }}
          {% endif %}
3 Likes
3

It works perfectly! Thank you very much for your help.

1 Like