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Description
An ultra low-cost, low-power FM radio station.
It uses the hardware on the raspberry pi that is meant to generate spread-spectrum clock signals on the GPIO pins to output FM Radio energy.
This means that all you need to do to turn the Raspberry-Pi into a (ridiculously powerful) FM Transmitter is to plug in a wire as the antenna (as little as 20cm will do) into GPIO pin 4 and run the code.