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# A Wishbone Controlled FM Transmitter Hack

This Hack is based off of two things: 1) the interface spec of the WB

controlled PWM audio device, and 2) a Raspberry Pi Hack I was shown that

converted the RPi PWM device into an FM transmitter.  So, the question is, can

a GPIO pin be turned into an FM transmitter that can be heard throughout the

house?

The answer is that a GPIO pin can be transformed into an FM transmitter, and

that it then and broadcasts nicely--although weakly.  If I make every

pin a GPIO pin, then I can get perhaps a yard or so from the transmitter device.

The hack also has a newer interface, written but not tested, that outputs

4-samples per clock.  This should provide a rough 10dB boost to the signal

strength since the signa would no longer be undersampled, but I haven't tested

the update yet.  That and an antenna (I never used any antennas) should be

able to provide a nice capability.