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Side-looking infrared emitter and detectors. These simple devices operate at 940nm and work well for generic IR systems including remote control and touch-less object sensing.
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Using a simple ADC on any microcontroller will allow variable readings to be collected from the detector. The emitter is driven up to 50mA with a current limiting resistor as with any LED device.

The detect is a NPN transistor that is biased by incoming IR light.



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