Hi folks, I could realy need some help on a project I want to do in the future.
I live in an apartment with an ancient door phone/intercom system, I essentially want to replace the door phone with a tablet like raspberry pi 3 setup and a nice UI frontend, retaining all the functions of the door phone, ie. doorbell, unlock the front door, and possible talking to the person on the outside.
The problem is that I don’t know anything about how the system works, other then it must be a simple analog system, however I don’t want to end up doing any harm in the process.
I found this schematic for my exsisting door phone (its a Siedle HTA 711), maybe somebody can help me understand if its even possible to connect to a pi’s GPIO?