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.
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× 1Buy
- Reed switch module + magnet× 1Buy
- Active buzzer× 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.
Code
The tested Arduino / ESP32 code for this project will be posted here, ready to copy.