Input boolean based on trigger.to_state and trigger.from_state comparing

Configuration
1

Hi, I have a watermeter counting litres and providing value in 20 secs interval via MQTT, the interval might be adjusted. Sensor value is increasing. I want to use it as a “flow meter” for indication that any valve or faucet in the house is opened.
My idea is to compare consecutive values and if value trigger.to_state == trigger.from_state then input_boolean or binary_sensor will indicate “close” and “open” otherwise

I tried this automation

  - alias: "flow_active"
    mode: restart
    trigger:
      platform: numeric_state
      entity_id: sensor.watermeter_main_lt
      above: '0'
    action:
      - service: >
            {% if trigger.to_state != trigger.from_state  %}
              input_boolean.turn_on
            {% else %}
              input_boolean.turn_off
            {% endif %}
        target:
          entity_id: input_boolean.flow_active

and this

            {% if trigger.to_state == trigger.from_state  %}
              input_boolean.turn_off
            {% else %}
              input_boolean.turn_on
            {% endif %}

or

{% if trigger.to_state.state == trigger.from_state.state  %}

but none of them is working :roll_eyes:
Any advice please - proper syntax or better solution?

2

Your automation’s Numeric State Trigger will trigger at the moment when the sensor’s value crosses the threshold value. In other words, at the moment when it increases from below 0 to above 0.

It won’t trigger again until the sensor’s value first decreases below 0 then rises above it.

When it does trigger, the value of trigger.to_state.state will be above 0 and the value of trigger.from_state.state will be below 0. The two variables can never be equal because that arrangement can never serve to trigger the Numeric State Trigger.

3

Uh, I see.
Sorry for my misunderstandig of trigger.
Thank you