How to make a line follower robot using a 3-way IR infrared sensor module
RJ3iB Controller Linetracking Setup and Operations Manual | PDF | Safety | Robot
LineTracker Line Sensor Board (Unassembled) Line Sensors | Jsumo
Digital Line Tracking Sensor (RobotDYN) | 3D CAD Model Library | GrabCAD
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) :
Arduino Based Line Tracker Robot : 4 Steps (with Pictures) - Instructables