1. When the module detects the signal of the obstacle ahead, the green indicator light on the circuit board lights up, and the OUT port continues to output a low-level signal. The module has a detection distance of 2 to 30cm and a detection angle of 35. The detection distance can pass the potential. Adjust the potentiometer clockwise to increase the detection distance; adjust the potentiometer counterclockwise to decrease the detection distance.2. The sensor actively detects infrared reflection, so the reflectivity and shape of the are the to the detection distance. Among , the black detection distance is the smallest, and the white detection distance is the largest; the small area object has a small distance, and the area has a distance.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 : VCC-VCC; GND-GND; OUT-IO4. The comparator adopts LM393, which works stably; The module can be powered by 3-5V DC supply. When the is turned on, the red indicator light is on; With 3mm screw holes, it is easy to fix and install;5. Each module has already adjusted the comparison voltage through the potentiometer before delivery. Unless there are special circumstances, please do not adjust the potentiometer at will.Module interface description1 VCC external 3.3V-5V voltage (can be directly connected to 5v microcontroller and 3.3v microcontroller)2 GND External GND3 OUT small board digital output interface (0 and 1)Circuit board size: 3.2CM x 1.4CMMaterial: PCB, metalcolour: bluePackage Contents:20 x IR Infrared SensorOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.