The sensor module's light is adaptable to the environment. It has a pair of infrared transmitting and receiving tubes. The infrared tube emits a certain frequency. When the detecting direction meets an obstacle (reflecting surface), the reflected infrared is received by the tube. After comparator circuit processing, a green indicator lights up, and simultaneously, the signal output interface outputs a digital signal (a low-level signal). The detection distance can be adjusted through the potentiometer knob. The effective distance range is 2–30 cm, and the working voltage is 3.3V to 5V. The sensor's detection range can be adjusted via the potentiometer; it has low interference, is easy to assemble and use, and can be widely used in robot obstacle avoidance, obstacle avoidance cars, line counting, and black and white line tracking, among many other applications.

Module parameters:
1. When the module detects obstacles in front of the signal, the green indicator on the circuit board lights up, and simultaneously, the OUT port outputs a low-level signal. The detection module ranges from 2–30 cm, with a 35° detection angle. The detection distance can be adjusted through the potentiometer. Turning the potentiometer clockwise increases the detection distance; turning it counter-clockwise reduces it.
2. The sensor uses active infrared reflection detection; therefore, the reflectivity and shape of the target are key to the detection range. A white object has a minimum detection range, and a black object has a maximum. The distance is shorter for small objects and longer for large ones.
3. The sensor module's OUT port can be directly connected to a microcontroller IO port or can drive a 5V relay directly. Connection mode: VCC – VCC; GND – GND; OUT – IO.
4. The comparator uses the LM393, ensuring stable operation.
5. The module can use a 3–5V DC power supply. When powered on, the red power indicator light illuminates.
6. 3 mm screw holes allow for easy fixing and installation.
7. Circuit board size: 3.2 cm × 1.4 cm
8. Each module is shipped with the comparator threshold voltage already adjusted via the potentiometer. Unless absolutely necessary, please do not arbitrarily adjust the potentiometer.

Module interface specifications
1. VCC voltage is 3.3V to 5V (directly connectable to 5V single-chip microcontrollers and 3.3V ones).
2. GND: external GND
3. OUT: small board digital output interface (0 and 1)