here is the last project I'm working on. I'm trying to build myself my own RC transmitter with my android phone (geeksphone zero) as configurator.
I first try to get a working ppm out of my custom IOIO board, but it was not working very well :
So I decided to add another chip (pic18f46j50) to my IOIO to generate a nice PPM signal.
After that I used nearly the same board to catch Accelerometer, gyroscope, barometric pressure and temperature (ms5607) and GPS and to send it in the Frsky receiver, and plugged the frsky transmitter to the IOIO board.
So I'm able to retrieve the data sent according to the frsky protocol and data from my custom hub and display it on a custom android app :
and a prototype of my new radio...