So, I'll take this to mean that you are trying to use the ONE serial port on the Arduino to talk to some device in the car AND to Processing. That will NOT work.
Hi PaulS,
I would like to mention that there are two arduino boards, one Mega and one Uno. Why this will not work, considering that it seems to be working now with 19200 bps ???
The only problem is that it has some delay as I mentioned previously . Because I would like to make sure that I have not misguided you with my descriptions, I have added a simple diagram of my apparatus.
Please have a look at the diagram and tell me whether that is what you thought of my descriptions or not. Also if your answer is that my apparatus is not going to work, would you be able tell me why not and how I can go about fixing it?