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yeap. I bought the ELM327 chip and assembled to all protocols. and it is working ok, but only on my computer. I think that is just plug the serial port of the ELM scan to serial port of the arduino. i think that is ok.
my problem is to put the LCD display on the arduino. how i need to connect the wires? which ports? on which pins? i need to buy the MC33290 chip? i just use this image opengauge.org/%7Eobduino/diagram/obduino.gif?
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