Line Track Module

It consists of two parts – an IR-emitting LED and an IR-sensitive phototransistor. When the phototransistor detects the reflected infrared light from the IR-emitting LED, it will output a digital signal. This digital signal changes from HIGH to LOW. This Line Finder can output a digital signal to a microcontroller, so the robot can reliably follow a black line on a white background or vice versa. The line finder works on TTL digital output mode. The output becomes HIGH when black is detected and LOW when white is detected.