IR Receiver&Transmitter Module

An infrared transmitter is simply a Light
Emitting Diode which generates
invisible IR light with a wavelength of
between 1 mm and 750 nanometers, and some associated circuitry. In an
infrared remote control, for example, pushing a button sends an electric
signal to the LED, which converts the
signal into a beam of infrared light. The
receiving device detects the light with a
photodiode and converts it to an
electrical signal which, via an integrated
circuit, controls its action