I would like to make Opener comatible with Urmet 1138/3
We already did some investigations and even documented a circuit diagram.
Status:
Opener Works if a 750 Ohm resistor is used between BLUE cable and CA Connector.
Opener does not detect RING signal.
It seems like opener requires a falling signal flank, arround 5V in order to detect a RING signal.
Since this signal provided by Urmet 1138/3 is a little AC signal (arround 1,5 V) it does not get detected.
TO Nuki Opener Dev Team:
Do you see a possibility to adapt the firmware to use i.e. Audio_IN to detect a RING signal of that type?