Adults onlyArduino NanoLevel 1/3
Reverse Parking Sensor
Green, yellow and red LEDs plus faster beeps as you back up. At 20 cm: a long beep, all red, STOP.
Adults only
Fitting it to a car means car wiring.
Not for children. Build at your own risk.
Build and test it on the bench. In a car, use a proper 12V-to-5V converter, a fuse and a qualified person. Always check your mirrors too.
Strictly follow the description given with this video.
Video
The video link will be added here soon.
How it works
- The HC-SR04 measures the distance behind the car.
- Under 2 m green lights, under 1 m yellow, under 50 cm red.
- The beeps get faster as the distance drops.
- At 20 cm it beeps continuously: stop.
Parts you need
- Arduino Nano× 1Buy
- HC-SR04 ultrasonic sensor× 1Buy
- LED bar module (green, yellow, red)× 1Buy
- Active buzzer× 1Buy
- Breadboard, jumper wires, USB 5V adapter (bench demo)× 1Buy
Kit for this projectPrice on request
Get the kitWiring
PowerGroundSignal
| # | From | Connect to |
|---|---|---|
| 1 Signal | HC-SR04 TRIG | Nano D10 |
| 2 Signal | HC-SR04 ECHO | Nano D9 |
| 3 Power | HC-SR04 VCC | Nano 5V |
| 4 Ground | HC-SR04 GND | Nano GND |
| 5 Signal | LED bar G | Nano D7 |
| 6 Signal | LED bar Y | Nano D6 |
| 7 Signal | LED bar R | Nano D5 |
| 8 Ground | LED bar GND | Nano GND |
| 9 Signal | Buzzer + | Nano D8 |
| 10 Ground | Buzzer − | 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.