I am trying to connect my apartment door bell system to my raspberry pi; I am not too good with the wiring, and hope someone can help.
What I have:
- 3 wires from the door bell system: red wire, black wire, white wire.
- 1 digital multimeter
- 1 AC/DC to DC Power Supply Converter Step Down
The AC/DC to DC Power Supply has the following specs listed:
- Input: DC 0V ~ 30V or AC 0V ~ 20V
- Output: DC 1.25V ~ 28V (continuously adjustable)
- Output current: 2A Max.
What I am trying to do: connect the wires from door bell system to the power supply, then output a 3.3v DC logic input to the raspberry pi.
What I need: the transformer needs a ground and a live wire, I need to find out from that three colored wires from the apt door bell system
what's my problem: my multimeter showed me some frustrated digits, I'm out of clues to define the correct wires, and here I am...
My multimeter result with the button not pushed:
black and red: 10v AC; white and red: 12v AC; black and white: 1.5v AC;
If I press the door bell button outside
black and red = 0v AC; white and red = 12v AC; white and black = 0v AC;
So how do I connect wires to the power supply?