Parameters 1. When the module detects the front obstacle signal, the green indicator light on the board lights up, and the OUT port continuously outputs the low level signal. The module detects the distance of 2 ~ 30cm, the detection angle is 35 °, the detection distance can pass the potential Device to adjust the clockwise potentiometer, the detection distance increases; counterclockwise adjustable potentiometer, the detection distance is reduced. 2. The sensor active infrared reflection detection, so the target reflectivity and shape is the key to detect the distance. Which black detection distance is the smallest, the largest white; small area of ??the object distance is small, large area distance. 3. The sensor module output port OUT can be directly connected with the microcontroller IO port and can also directly drive a 5V relay; Connection: VCC-VCC; GND-GND; OUT-IO 4. The comparator use LM393, stable; 5.It can be used 3-5V DC power supply to the module. When the power is on, the red power light is on; 6. It is easy to install with 3mm screw holes; 7, The circuit board size: 3.1CM * 1.5CM 8, Do not arbitrarily adjust the potentiometer. Module interface description (3-wire) 1 VCC external 3.3V-5V voltage (can be directly connected with the 5v microcontroller and 3.3v single-chip) 2 GND External GND 3 OUT small board digital output interface (0 and 1)