i want to control a Hörmann Promatic 3 garage door opener with a Sonoff SV.
Therefore i used a 9 V DC Power Adapter and removed the resistors of the Sonoff to use it in isolated mode.
I connected the relay on the input of my garage door opener (see page 25)
This works already fine. I can open and close my garage door via openhab.
The unit has a 24 V DC output which is signalling an closed door.
How can i connect the 24 V DC output of the door opener to an GPIO-Pin (4,5 or 14) to control the state of the garage door?
Thanks a lot!