How to make an obstacle avoiding robot with three ultrasonic sensors
DIY Obstacle Avoiding Robot Kit | Vaanahaa
Obstacle Avoiding Robot - Hackster.io
Amazon.com: WiFi Smart Robot Car Kit with UNO R3, Line Tracking and Obstacle Avoidance Ultrasonic Sensor, HD Camera Wireless RC Intelligent Educational Toy Car Robotic Kit for Arduino Learner (Upgraded Version) :