Recent content by Chri

I found a arduino project which used a PC814 behind a 1k resistor to connect the bell to the GPIO. for the door opener there are quite some projects out there that use a relay sure, question is if diods are needed if we connect it parallel to the existing handset. For the audio I'm not sure if...

Interesting topic! I was looking for something similar but didn't get to a conclusion yet. The idea is to use DoorPI on a PI Zero - Door opener and bell signal can be handled via the GPIO - For Mic and audio out a usb sound card or pi audio hat is needed My problem as an electronic noob is...