Now I added Bluetooth and I have made a Java application to send/receive data over bluetooth from my car.
Here is a video about how works:
http://www.youtube.com/watch?v=9ujtkJY-nvE
Here you can see presentation for first version Arduino car: https://dan.iftodi.com/2013/02/prezentare-bmw-masinuta-bazata-pe-arduino/
Pentru cei interesați de Arduino, acum și în Moldova: