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IR and RF communication links assembled on a breadboard for the demo.
Consumer IR devices use an infrared LED in the handheld remote and an IR receiver located inside the device. Typically for IR, the frequency is in the 30-60Khz range with 38Khz being the most common carrier frequency.
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The low cost devices used in the demos will operate at 2400 baud (or bits per second (BPS) ).
For the demo, both the transmitter and receiver are attached to mbed, but in a typical application they would be on different subsystem with its own processor, and physically separated by several meters.
Wireless keyboards and mice use RF links at 27Mhz or 2.4Ghz.Since sunlight and ambient room lighting would interfere with any IR detector just looking at light levels, the signal modulates (i.e. There are a few early first generation electronic ballasts for fluorescent lights operating this range that can cause interference with IR remotes, but in most cases it works well.This means that the IR LED transmitter must be modulated. The IR detector modules have a built-in bandpass filter and hardware to demodulate and recover the original signal.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.It is a bit more complex than appears at first glance, since the start bit must be zero for the 10-bit serial port input hardware to work, and the IR receiver inverts the signal.