IR emitter and Detector

Infrared Emitters and Detectors emit and detect infrared light. What a surprise! Well, what does that mean? It means you can remote control things, and detect objects nearby. The pair can be used to measure distances, and for example heartbeat / pulse from a finger.

Emitter: yellow, Detector: Red.

more info and links at the Sparkfun page

I made a quick tutorial showing how to use the detector to receive any remote controller button presses and light up leds with Arduino.