Quote:
Originally Posted by rmccomiskie
Question: What signal voltage level is needed to trigger the external interrupt pins? The normal ECU signal is negative going. Looking back at my scope images of the flatline, I see that there are some verrry small positive blips. Could it be that they are triggering the external interrupts opposite of what is expected?
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The pins will signal an "on" @~2.5 volts on a rising signal, and "off" @~2.2 volt falling signal.
So is it just instant that is off? Can it predict gallons needed for a tank refill pretty well?