Arduino Ultrasonic and IR Sensor Fusion for Omnidirectional Obstacle Detection

This tutorial shows how to combine HC-SR04 ultrasonic and IR sensors on Arduino to detect obstacles that either sensor alone might miss. Ultrasonic handles long range but fails on soft or angled surfaces, while IR covers close range but struggles with dark colors. The dual-sensor system uses debouncing and logic to improve reliability for obstacle-avoidance robots.