Integrating unity 5 standard assets car controller scripts with arduino

I’m very basic to Unity. I’m trying to make driving simulator. I’ve designed path for the driving test but I’m having problem while using arduino for giving inputs to unity.I have used unity 5 standard assets car and its scripts .Have anyone tried to integrate arduino with unity for car controlling function. I am having trouble with integrating arduino with unity 5 standard assets car controller scripts. If anyone have tried please let me know

Have you maybe tried that the arduino appears as a standard input to your computer?
Maybe take advantage from these built-in libraries…