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Sharp IR Proximity and Range Finder Sensor
Infrared proximity and range finder sensor made by Sharp. Part # GP2Y0A21YK has an analog output that varies from 3.1V at 10cm to 0.4V at 80cm. This sensor is not only detecting objects in the specified range, but also it can measure the distance of the detected object.
These connectors have three wires: ground, vcc, and the output signal. Because this sensor fire continuously and don't need any clock to initiate a reading cycle, it is easy to interface with any mirocontroller or Arduino
