Fridge door left-open alarm
I want to build a fridge door alarm on an Arduino Nano with a reed switch and a buzzer that beeps if the door stays open for more than a minute.
Parts
Arduino Nano V3 (CH340, Type-C) 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-C to USB-A Cable (56kΩ pull-up, 1m, 22AWG) 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.