Hello guys, finally a new technical episode and a new concept behind all this electronic stuff.
I decided to use MobiFlight for a while instead of writing a connection software for the arduino myself. You can find out everything about the reasons in the video. I have to say that the connection with MobiFlight is very stable and easy to configure. You have to keep in mind that the software doesn't synchronize the positions of your hardware switches with the switches in the simulator so you have to check these yourself before you start MobiFlight.
Now I have to get some more Arduino Megas to keep them installed in my simulator.