You’re bored with the old style doorbell, and like to have a brand new doorbell hacking with the little help of Arduino? Hehe, then you’re now having the chance to develop this fun hacking experience…
About the doorbell, it can be either battery operated or mains powered, which need to plug straightly into the wall. No matter what types of doorbell you’re using, just make sure that its on the fine condition.
As you can see on the above figure, there are three wires connected to the Arduino board. The red wire is +3V and the black wire is ground. Since the doorbell chime unit usually draws its power from two AA batteries, thus it will get the same three volts from the Arduino too!
The short white wire is act as the antenna for wireless reception of the signal from the remote button, and the other longer white wire will complete the circuit to the buzzer! IN this case, the Arduino treats it as an analog signal. As a result, you can use it to drive a transistor to close a digital switch and it should works for this purpose.
The USB cable is used to supply the power and acts as a serial line in this project.