The TCRT5000 Single Channel Line Tracking Sensor Module is an excellent choice for line-following robots, featuring an adjustable potentiometer to fine-tune sensor sensitivity. This compact carrier board uses a TCRT5000 reflective optical sensor, providing a digital output for quick integration into robotics systems.

Though primarily designed for line-following applications, it's also suitable for mini-sumo robots and other surface-detection tasks. The sensor works on the principle of light reflection—white surfaces reflect infrared light, producing a higher voltage, while black surfaces absorb it, resulting in a lower voltage. A pull-up resistor and voltage divider circuit convert the IR reflection into readable output, enabling accurate line detection.