SunFounder IIC I2C Line Follower Module 8 Channel Infrared IR Detection Tracking Sensor for Arduino Smart Car Robot Robotics MCU STM8S105C4 TCRT5000 Uses the MCU STM8S105C4 as the controller, and the TCRT5000 infrared photoelectric sensor on each of the 8 line-following modules Adopts I2C ports which only occupies 4 pins of the MCU The sensor TCRT5000 is highly sensitive with reliable performance(SensingDistance12mm , 8mmwill be the best With a RESET button on the board for resetting, and positioning holes on the board for easy assembly Supply Voltage: 5V; PCB Dimensions: 124mm x 30mm