Triggering when a value changes above (or below) a threshold

Configuration
1

I can’t figure out how to do the following automation:
I have a sensor value and I want to do something when it changes from below (or equal) a threshold value to a value above the threshold.
For example:
Threshold is 20
sensor value changes from 7 to 10 - do nothing
sensor value changes from 10 to 11 - trigger automation
sensor value changes from 11 to 12 - do nothing

My problem is that I would need the previous sensor value, but don’t have access to it in an automation.

Any idea how to implement this?

2

This kind of operation is easy in AppDaemon - when you subscribe to a state change you are handed the old and the new values so you can decide what to do.

3

I saw this before. However, I’m still interested to see if this can be done with the “normal” automations.

4

Make a sensor and trigger it with something like this:
`
trigger:
platform: numeric_state
entity_id: sensor.battery_stefan
below: 15
action:

  • service: notify.Stefan
    data:
    title: ‘Home Assistant’
    message: ‘Stefan’‘s batterij is bijna leeg!’
  • service: notify.Denise
    data:
    title: ‘Home Assistant’
    message: ‘Stefan’‘s batterij is bijna leeg!’ `
5

Does this fire only once? That would be what I’m looking for but I had expected that this will fire as long as the value stays below this value.

6

It sends just once, untill it goed above and then below the treshhold again

7

Cool, that’s exactly what I was looking for.

8

Good to know because this is the center of my issues with implementing the laundry sensor project.