i assembled my elm327.
i dont understand yet. here code.google.com/p/opengauge/wiki/OBDuinoInterface there is the interface with elm327 but the PWM protocol dont is used.
the pins 3, 4, 11 e 13 of the elm327 chip are not used on the diagram above. i must to buy the MC33290 chip too? the PWM will be converted on CAN protocol?
i am lost
but, again, thanks a lot by you help.