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Old 03-09-2011, 06:45 AM   #4 (permalink)
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Originally Posted by bobski View Post
So I can use the MPGuino name?

Well I took it for a test drive and it looks like the optocoupler draws enough current to make the ECU throw a VSS error code. I'll try a higher value current limiting resistor and see what happens.
Is there any serious advantage of using the optocoupler over the zener diode? I'd imagine it would be much safer for both the car and the arduino, but that said it doesn't seem the zener diode way has failed people yet.

I'm just wondering if its bleeding off the vss to ground at 5.1v will this cause odo reading errors?
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