Kids OK with adultArduino NanoLevel 1/3
Fridge Door Alarm
Leave the fridge open for 30 seconds and it beeps until you close it, saving food and electricity.
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Kids OK, with an adult
DIY project. Children must build this only with an adult (16+ years) beside them at all times. Not suitable for children under 8 years.
Strictly follow the description given with this video.
Video
The video link will be added here soon.
How it works
- A reed switch on the fridge body and a magnet on the door edge sense open or closed.
- When the door opens, the Nano starts a 30-second timer.
- Still open after 30 s: the buzzer beeps and the LED blinks.
- Close the door and it goes quiet.
Parts you need
Arduino Nano₹345× 1Buy
Reed switch module + magnet× 1Buy
Active buzzer₹17× 1Buy
Red LED module× 1Buy
Breadboard, jumper wires, USB 5V adapter× 1Buy
Kit for this projectPrice on request
Get the kitWiring
PowerGroundSignal
| # | From | Connect to |
|---|---|---|
| 1 Signal | Reed DO | Nano D2 |
| 2 Power | Reed VCC | Nano 5V |
| 3 Ground | Reed GND | Nano GND |
| 4 Signal | Buzzer + | Nano D8 |
| 5 Ground | Buzzer − | Nano GND |
| 6 Signal | LED SIG | Nano D9 |
| 7 Ground | LED GND | Nano GND |
3D print files
This project has no 3D-printed parts.