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IR Sensor or IR Proximity Sensor is a multipurpose Infrared sensor Since the Infrared Sensor module works on INFRARED, for obstacles with reflective surfaces (white colored), the maximum range will be higher & for non-reflective surfaces (black colored), the maximum range will be lower. This can in turn be used for detecting white/black lines (in line follower ROBOTs),bright/dark objects (in object identification ROBOTs) Useful for various Robotic Applications,Obstacle sensing Robotics,Room Visitor Counter Systems, etc & also as an encoder sensor.IR Sensor provides a digital output.Logic one(+3.5V) when an object is placed in front of the sensor & logic zero(0V),when there is no object. On-board RED LED is used to indicate the presence of an object.IR OBSTACLE SENSOR is designed to work with almost all ARDUINO boards and MICROCONTROLLERs - AVR, PIC, 8051, ARM etc. Operating Voltage: 5V,Adjustable Range using preset (potentiometer on board). Any Query, Please Visit MY TechnoCare Website