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Thank you ghettoman, flahiker, UrsusA.
I wish to make a home made cpu for monitoring the controling parameters like car speed, engine speed itc, whatever I can get from the car cpu. I am owner of a Hyundai car. And I would like just use the data which is allready meausered by default included computer.
although some information might be available through the diagnostic interface (OBD-II interface), you run into problems interpreting the stuff sent on it since no automobile manufacturer will give you the meaning of the sent data.
Sorry for the bad news,