Howto:Use Arduino with FlightGear
Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. FlightGear's IO interface allows easy development of hardware that can improve the immersion and realism of the simulation. The output protocols allow hardware to response to simulation data (like shown in the image on the right), while the input protocol allows FlightGear to reply to hardware events (eg. on the press of a button).