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Solder header pins into the breakout boards and everything will hookup on a breadboard.
Point the IR LED towards the receiver breakout board.
In the demo code, mbed's PWM hardware supplies the 38Khz carrier for transmission. The IR LED CTRL input is driven by the 38Khz PWM signal.IRLED = .5 generates a 50% PWM duty cycle to produce a 38Khz square wave for the carrier.The gnd pin on the IR LED is actually switched on and off using mbed's serial data output to eliminate the need for any external digital logic, and still permit direct use of the serial port hardware for 38Khz IR data transmission.Cordless phones use 900Mhz, 2.4Ghz, and now 5.8Ghz.Key fobs, garage door openers, and some home automation systems use 315Mhz or 434Mhz.
IR and RF communication links assembled on a breadboard for the demo.