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Author Topic: Arduino + OBDII(VPW only) > 20x4 LCD display  (Read 2185 times)
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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?
Thanks

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You dont have to touch powerlines for them to kill you, even looking at them for too long will make them angry.
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Optoisolator wont hurt, you will need a regulator if you arent using the onboard regulator on the arduino.
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"Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent di

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Can u post the code, here?
tks
 smiley-grin
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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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