There is a wire going into the doorbell button that shows voltage. and A guide: interfacing buzzer with arduino nano Connecting a buzzer to the raspberry pi
Buzzer raspberry pi circuit connect connecting projects Buzzer arduino nano interfacing Buzzer arduino piezo fritzing
.
.
Arduino - Door Sensor - Piezo Buzzer | Arduino Tutorial
A Guide: Interfacing Buzzer with Arduino Nano | ElectroRules
There is a wire going into the doorbell button that shows voltage. And