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Pilot Read - How does Arduino handle without a external comparator

I see from the schematics the Pilot Read ends up @ the ADC1. Where can I find more info on how the Arduino sense the 4 states 12,9,6,3V, specially the 3V because the ADC1 is 5V and also the fact that we have a PWM running on that wire.

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OpenEVSE scales the +12v to -12v signal to 0 - 5v and samples it on ADC1.

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