There is a wire going into the doorbell button that shows voltage. and Buzzer arduino piezo fritzing A guide: interfacing buzzer with arduino nano
A Guide: Interfacing Buzzer with Arduino Nano | ElectroRules
Door wire doorbell bell chimes diagram two button voltage wiring transformer chime shows bells second going do rings case using Buzzer arduino nano interfacing Connecting a buzzer to the raspberry pi
Buzzer raspberry pi circuit connect connecting projects
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Connecting a buzzer to the Raspberry Pi - Connecting a buzzer to the
Arduino - Door Sensor - Piezo Buzzer | Arduino Tutorial
A Guide: Interfacing Buzzer with Arduino Nano | ElectroRules