Door alarm
A buzzer when the door opens.
I want to build a door alarm on an Arduino Uno with a reed switch and a buzzer that sounds when the door opens.
Parts
Arduino Uno R3 CH340G ATmega328P Board In stock
MC-38 Magnetic Reed Switch In stock
Active Piezo Buzzer Module 5V 2.3kHz In stock
23 AWG Solid Core Hookup Wire In stock
USB Type A to B Cable (1m) In stock
Pins, wiring and code
The pin table, the wiring steps and the code for this build are in Soldr. Start this build on Soldr - you can change it before you buy.