When the module detects an obstacle signal ahead, the green indicator light on the circuit board lights up at a certain level, and the OUT port continues to output a low-level signal. The module detects a distance of 2-30cm and a detection angle of 35 °. The detection distance can be adjusted through a potentiometer. Clockwise adjustment of the potentiometer increases the detection distance; Turn the potentiometer counterclockwise to reduce the detection distance. 2. The sensor actively detects infrared reflection, so the reflectivity and shape of the target are the key to the detection distance. Among them, black has the smallest detection distance and white has the largest; Small objects have smaller distances, while large objects have larger distances. 3. The output port OUT of the sensor module can be directly connected to the IO port of the microcontroller, or it can directly drive a 5V relay; Connection method: VCC-VCC; GND-GND；OUT-IO4、 The comparator adopts LM393, which works stably; 5. The module can be powered by a 3-5V DC power supply. When the power is turned on, the red power indicator light is on; 6. Featuring 3mm screw holes for easy fixation and installation; 7. Circuit board size: 3.1CM * 1.5CM