Adults onlyESP32Level 2/3
Child-in-Car Alarm
If the car is locked and a motion sensor sees movement inside, the horn sounds and your phone gets an alert.
Adults only
Involves car electrical wiring.
Not for children. Build at your own risk.
Strictly follow the description given with this video.
Video
The video link will be added here soon.
How it works
- The PIR sensor watches the cabin for movement.
- When the car is locked, any movement means someone is inside.
- The ESP32 switches the relay, which sounds the car horn.
- It also sends a phone alert, because a locked car heats up in minutes.
Parts you need
Kit for this projectPrice on request
Get the kitWiring
PowerGroundSignal
| # | From | Connect to |
|---|---|---|
| 1 Signal | PIR OUT | ESP32 D4 |
| 2 Power | PIR VCC | ESP32 5V |
| 3 Ground | PIR GND | ESP32 GND |
| 4 Signal | Relay IN | ESP32 D22 |
| 5 Power | Relay VCC | ESP32 5V |
| 6 Ground | Relay GND | ESP32 GND |
| 7 Signal | Relay COM | Car 12V + |
| 8 Signal | Relay NO | Horn |
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.