How to Build a Raspberry Pi Radio Transmitter

This page basically says "Install this file, magic!"

If you want the technical details behind it, a good starting place is http://www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspb...

Or the blog of the creator at http://www.omattos.com/node/19

I should point out that the pifm code is a bit of a hack and does not properly reset the DMA controller when you stop running it. It will leave the FM signal active until you reset the pi.

fun semi-related EE design fact that readers may find interesting:

one of the fastest ways to tell that someone didn't know what they're doing when they designed a board is that they placed the oscillator anywhere other than right next to the component it drives. the traces that connect the oscillator to the component are basically an antenna - the longer they are, the stronger they broadcast. This becomes an issue when there are multiple oscillators in close proximity - their broadcasts can interfere with each other and cause them to synchronize. I forget what this effect is called but here's a neat video that kinda illustrates it: https://www.youtube.com/watch?v=kqFc4wriBvE&feature=kp

Does anybody happen to know if it's just as easy to read the pins at 91.25, 94.75, and 95.75 MHz?

Lately I've been trying to find a way to do exactly that - initially using audio in - but so far without any luck.