Amazon.com: Gikfun 5mm 940nm LEDs Infrared Emitter and IR Receiver Diode for Arduino (Pack of 20pcs) EK8443 : Industrial & Scientific
Amazon.com: DollaTek Infrared IR Wireless Remote Control Sensor Module Kits for Arduino
Mixse Infrared IR Obstacle Avoidance Tracking Sensor Module for Arduino Smart Robot Car 2pcs: Amazon.com: Industrial & Scientific
Amazon.com : DIYmall 10pcs/Pack IR Infrared Obstacle Avoidance Sensor for Arduino Smart Car Robot IR Transmitting and Receiving Tube Photoelectric Switch : Electronics
OSOYOO 10PCS TCRT5000 Infrared Reflective IR Photoelectric Switch Barrier Line Track Sensor Module for Arduino Smart Car Robot with 5 8Pin Female to Female Jumper Wires: Amazon.com: Industrial & Scientific