Prime Intact Four-Way Infrared Tracing 4 Channel Tracking Line Sensor Module Transmission Obstacle Avoidance for Arduino DIY Smart Car Robot Electronic Components Electronic Hobby Kit

4 channel infrared tracking sensor module ir line patrol for arduino smart car feature: Smart car or a robot hunt (including black and white lines), walking path along the black line, also known as tracking. Smart car to avoid obstacle and cliff, anti-drop. Can be applied to other automation applications of photoelectric reflex.