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These side-looking Infrared Emitter and IR Detector operate at 940nm and work well for generic IR systems including remote control and touch-less object sensing. 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. Sold as a pair, with one Emitter and one Detector.
An application example can be found on the website of Adafruit.
More information is available on the website of Sparkfun.