Detect lines and other objects with this infrared reflective sensor from Waveshare! Features Reflective infrared Transceiver Features wide-range voltage comparator LM393 Adjustable sensitivity Signal output indicator Sensor only – no cable Specifications Power: 3.0V ~ 5.3V Dimension: 25mm * 15.9mm Mounting hole size: 2.0mm Resources Product Wiki In the case of working with an MCU: VCC 3.0V ~ 5.3V GND power supply ground AOUT MCU.IO (analog output) DOUT MCU.IO (digital output)