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jamesoncollins / gauge_driver

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battery warning doesn't work #2

Open jamesoncollins opened 3 months ago

jamesoncollins commented 3 months ago

I'm assuming we're correctly soldered to D-05#14. It seems that we aren't picking up any voltage changes here. I believe that this signal should be LOW when the car isn't running. I also assume that when the car starts that this pin either goes HIGH, or it goes HIGH-Z. I don't know which, so currently I have the pin pulled high in software. This might be a problem for other circuits in the car, but I think the high source impedance of the voltage clamps should make it fine.

image

jamesoncollins commented 1 month ago

Current guess is that the VF of the diode isn't letting the gpio input get down before it's Vhl threshold.