Getting the duration of previous state of a sensor

Configuration
1

I’m using an A2DP sensor to see how long my commutes are (phone connected to car = sensor is ‘on’).
I would like to push a notification to my phone telling me how long I’ve driven at the moment the A2DP sensor turns to ‘off’.

To be able to do so I would need to know the duration of the previous state (which is ‘on’). Things coming to mind is starting/stopping a timer, using input fields to store the timestamps , perhaps a statistics sensor?

But perhaps there is an easier way to grab this data as HA is already recording it and the History graph card can show it?

2

I’d like to know this as well. I need to see how long my coffee maker is in the off state before it turns on.

3

There are a few ways, but the History Stats integration is what comes to mind first. You may need to also use a Template sensor to focus what the History stats sensor counts.

Another option is to use an automation to store the timestamp values in a helper or variable.

4

This discussion is old, but instead of creating a new thread I think its better to continue here. It is possible to have a condition based on the duration of the previous state when the state change of the entity is the trigger of the automation. In my automation I use the state change of a light entity to trigger the automation under the condition it has been switched from off to on and back to off within 0.3s. Effectively using the light switch as a type of pulse switch.

trigger:
  - platform: state
    entity_id:
      - light.buitenlamp_voordeur
    to: "off"

The condition template is true when the previous state has last less than 0.3s:

       - condition: template
          value_template: >-
            {{(now()|as_timestamp(0)-trigger.from_state.last_changed|as_timestamp(0))<0.3}}
          alias: Previous state last for less than 0.3seconds

This template is based on: