New to the forum and to arduino so please forgive my ignorance. I have a Quadcopter that is controlled by an arduino based card called autopilot. I am also currently constructing a LED array which is controlled by an Arduino Uno and it is using SPI to do that. What I need help with is that I would like to communicate somehow with the Uno via the autopilot which is connect to an RC radio on which I have a free channel. This would give me the ability to change the program on the Uno in mid-flight. Can this be done? If so then very very long descriptions with lots of pictures and graphs would be GREAT. Thanks in advance for any help you might give this poor lost soul.