I Built a Minimal NRF24 Remote-Controlled Arduino Car with Obstacle Avoidance
Hey makers! In this post, I'll share how I built a lightweight Arduino car project with NRF24L01 wireless control and simple obstacle avoidance using an ultrasonic sensor and a servo motor.
Whether you're a beginner working on wireless projects or someone who wants to improve their Arduino car skills, this one's for you!
What This Car Can Do
- Remote control via NRF24L01 module
- Automatic obstacle avoidance mode
- Simple servo scanning to measure distance
- Wireless communication with NRF24 data buffer
- Serial monitor feedback and mode switching
Parts & Components
| Part | Quantity |
|---|---|
| Arduino UNO/Nano | 1 |
| NRF24L01 Wireless Module | 2 |
| HC-SR04 Ultrasonic Sensor | 1 |
| L298N Motor Driver (or equivalent) | 1 |
| DC Motors with Wheels | 4 |
| Servo Motor (SG90/MG90S) | 1 |
| Jumper Wires, Breadboard, Battery Pack | As needed |
Wiring Overview
Here’s how I connected the components:
| Arduino Pin | Function |
|---|---|
| 2 | Servo Control |
| 3 | Right Motor Direction |
| 4 | Left Motor Direction |
| 5 | Right Motor PWM |
| 6 | Left Motor PWM |
| 7 | Ultrasonic Trigger |
| 8 | Ultrasonic Echo |
| 9 | NRF24 CE |
| 10 | NRF24 CSN |
[Insert wiring diagram image here]
Required Libraries
Install these libraries via the Arduino Library Manager:
RF24-
Servo(built-in)
How the NRF24 Communication Works
The car continuously listens for data packets from an NRF24 remote. The received data determines the joystick position and mode switches. It updates the car's motors and servo angle accordingly.
If no data is received within a set timeout, the car stops safely.
Obstacle Avoidance Logic
In obstacle avoidance mode:
- The servo scans in three directions: left, center, right
- The ultrasonic sensor measures distance at each position
- The car decides whether to move forward, Any ways to check the code look at the comments.
Top comments (1)
Here’s the link: golden34343.itch.io/minimal-nrf24-...