1、The detection range of the sensor can be adjusted with potentiometer, little interference, easy assembly and use. 2、It can be widely used for robot obstacle avoidance, obstacle avoidance car, assembly line, black and white line tracking and many other occasions. 3、When signal module detects obstacles ahead, the green indicator light on the circuit board is on and at the same time the OUT port outputs low level signal; detection distance can be adjusted with potentiometer, clockwise to increase detection distance;c 4、Active infrared reflection detecting sensor, so the target reflectivity and shape is the key of the detection range.Black color has the minimum detection range, white has the maximum; small objects have short detection range, large objects have long dete 5、Sensor module output port OUT can be directly connected to micro-controller IO port, also can drive a 5V relay directly. Description: Features: The detection range of the sensor can be adjusted with potentiometer, little interference, easy assembly and use. It can be widely used for robot obstacle avoidance, obstacle avoidance car,  assembly line, black and white line tracking and many other occasions. When signal module detects obstacles ahead, the green indicator light on the circuit board is on and at the same time the OUT port outputs low level signal; detection distance can be adjusted with potentiometer, clockwise to increase detection distance;counter-clockwise to reduce detection distance. Active infrared reflection detecting sensor, so the target reflectivity and shape is the key of the detection range.Black color has the minimum detection range, white has the maximum; small objects have short detection range, large objects have long detection range. Sensor module output port OUT can be directly connected to micro-controller IO port, also can drive a 5V relay directly. Comparator uses the LM393 chips, stable performance. Can use 3 to 5V DC power supply.When power on, the red power indicator light is on. Designed with 3mm screw holes for convenient fixation and easy installation; Specifications: Detecting Range: 2~30cm Detection Angle: 35° Wiring: VCC-VCC; GND-GND; OUT-IO Size: 4*1.5cm/1.5*0.6in Quantity: 5pcs Weight: 3g(approx.) Module Interface: GND: External GND OUT: Digital output port(0 and 1) Package Includes: 5 x Modules