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.
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