Grove - IR Distance Interrupter v1.2

Grove - IR Distance Interrupter is used to detect any object blocking the path of light, which is based on ITR9909. The ITR9909 consists of an infrared emitting diode and an NPN silicon phototransistor, encased side-by-side on a converging optical axis in a black thermoplastic housing, The phototransistor receives radiation from the IR only. This is the normal situation, but when an object is in between, the phototransistor could not receive the radiation. Any white (or lighter) colored surface reflects more than a black (or darker) colored surface. When the reflected light is detected, it produces Digital HIGH (or Binary 1) output on the SIG pin. The onboard LED indicator will also glow. If no reflection is detected or if the object is too far from the sensor, the output on the SIG pin stays at Digital LOW (Binary 0). The onboard LED indicator will be off as well. The detectable range of this sensor is 7.5–40 cm. The module incorporates a Rail-to-Rail Operational Amplifier to amplify