Basic IR Transmitter / Receiver (Tx / Rx) pair Infrared sensors work by sending out a beam of IR light, and then computing the distance / reflectivity to any nearby objects from characteristics of the returned (reflected) signal. A simple IR proximity sensor is essentially just an IR LED and IR photodiode. This simple sensor, though, would be prey to ambient light (i.e., your IR "receiver" would be responding to naturally present IR as well as reflected IR , and we would ...
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