It is sometimes required to diagnose a vehicle in order to find what's wrong with it and to fix it. Besides that, using OBD, one could read other information like: car speed, RPM, coolant temperature, throttle percentage and so on. That is particulary interesting when you don't have to carry a laptop with you.
Here is presented a device based on ATmega168 which implements VPW protocol (Variable Pulse Width). OBD interface is realised with just two optocouplers 4N35. Source code written in C is available on the authors website for download. If you whish to build this device, you must make sure that your vehicle uses VPW protocol.
nice post
keep post yah sob
wih keren tuh hehe...