Obstacle Avoiding Robot: Build Your Own Autonomous Navigator

Want to build a robot that can "see" and avoid walls and furniture? This project uses an Ultrasonic Sensor (HC-SR04) to measure distance and change direction accordingly.

How Ultrasonic Sensors Work

The sensor sends out a pulse of high-frequency sound (ultrasonic, hence inaudible). When this pulse hits an object, it bounces back. The time taken for the echo to return tells us the distance.

Formula: Distance = (Time × Speed of Sound) / 2

Components

• Arduino Uno
• HC-SR04 Ultrasonic Sensor
• Servo Motor (for sensor sweep)
• L298N Motor Driver
• 2x BO Motors & Wheels
• Chassis & Battery

The Algorithm

1. Move Forward continuously.
2. Measure Distance in front.
3. If distance < threshold (e.g., 20cm):
   • Stop.
   • Look Left (using servo to rotate sensor).
   • Measure distance.
   • Look Right.
   • Measure distance.
   • Turn towards the direction with more clearance.
4. Repeat.

Upgrade Ideas

• Add a second sensor on the back for reversing.
• Use an ESP32-CAM for visual object detection.
• Implement SLAM (Simultaneous Localization and Mapping) for navigation.

Get the Kit

Start building today with our Obstacle Avoiding Robot Using Arduino kit!