Easy to use: The OUT sensor module's output port can be connected directly to a microcontroller IO pin, and you can drive a 5 V relay directly. Function and applications: The IR obstacle avoidance sensor module can be used for robot obstacle avoidance, car obstacle avoidance, line counting, and tracking black/white lines. Adjustable range and field of view: Detection distance is 2 to 30 cm, with a 35-degree detection angle. Construction and output: The IR sensor module uses a pair of infrared transmitter and receiver tubes. The tubes emit infrared at a fixed frequency. When the emitted IR hits an obstacle with a reflective surface, it is reflected back and received. After processing by the comparator circuit, the green indicator lights. At the same time, a digital low-level signal is output via the signal output interface.