A few weeks ago I was here asking a question on how could I possibly control a quadrocopter with the PI. I got some really helpful replies, and finally I am done with it. (well, not quite done, I have a lot of projects ahead of me now)
The reason I post this here is that I would like contribute back to this awesome community here.
Link to the pics:
http://imgur.com/a/UPVZA
If anyone's interested I can post the source to control it too. (a warning: it is preeetty ugly right now) Basically I created a webserver on the PI and then started a websocket. You can connect to the PI through the Wifi stick with your phone and just go to a website and use the controllers there. I didn't see the point of getting an RC transmitter, it is much easier this way. And hey, the wifi stick has a range of ~100meters, so it's not bad at all. Latency is around 100ms, which is also perfect for me.
I used joan's pigpio library to send pwm pulses to the control board through the gpio pins.
If someone's trying to do the same, feel free to ask me. I hope this will help someone someday.