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Topic: Arduino + OBDII(VPW only) > 20x4 LCD display (Read 3886 times) previous topic - next topic


Im working on a standalone OBDII scanner and display for my car using an Arduino Uno. The car is a 1999 Pontiac Trans Am which uses the VPW protocol so ill be using an OBD VPW to RS232 interpreter chip. I think ill be powering the Arduino off the 8v off the 78L08 voltage regulator and tie arduino ground to chassis ground.

My questions are:
Are there any major software problems I may run in to?
Do I have enough power and signal isolation to protect the arduino (and my cars ECU)? (Do I need an opto-isolator or something?)
Any other foreseeable problems?


Optoisolator wont hurt, you will need a regulator if you arent using the onboard regulator on the arduino.
"Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent di



JD Duncan

I have build an almost identical design except that I am using the ELM327. I am also very interested in the code.

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