When The Module Detects An Obstacle In Front Of The Signal , The Green Indicator Light On The Board Level , While Low-Level Continuous Output Signal Out Port , The Module Detects The Distance 2 ~ 30Cm, Detection Angle 35 A���°, The Distance Can Detect Potential Is Adjusted Clockwise Adjustment Potentiometer To Detect The Distance Increases ; Counterclockwise To Adjust The Potentiometer To Reduce The Detection Distance . 2 .Active Infrared Sensors To Detect The Reflected , And Thus The Shape Of The Reflectivity Of The Target Detection Range Is Critical . The Minimum Detection Distance Which Black , White Maximum ; Small Objects From A Small Area , A Large Area From The Grand . 3 . The Output Port Out Sensor Module Can Be Directly Connected To The Microcontroller Io Port , You Can Directly Drive A 5V Relay ; Connection : Vcc-Vcc; Gnd-Gnd; Out-Io. 4 .Using The Comparator Lm393, Stable . 5 .Can Be Used For 3-5V Dc Power Supply Modules . When The Power Is Turned On, The Red Power. 6. With The Screw Holes Of 3Mm , Easy Fixed Installation . 7.Board Size : 3.1Cm * 1.5Cm. 8.Each Module Shipments Comparing The Threshold Voltage Has Been Adjusted By The Potentiometer Is Good , Not Exceptional Circumstances, Do Not Arbitrarily Adjust The Potentiometer. Interface Description (3-Wire): 1. Vcc: External 3.3V-5V Voltage (Can Be Directly Connected To 5V Mcu And 3.3V Mcu) 2. Gnd: Gnd External 3. Out: Small Board Digital Output Interfaces (0 And 1) Package Include: 5 X Infrared Obstacle Avoidance Module