Quote:
Originally Posted by AndrzejM
Tiago,
VSS sensor is connected to ECU (in most cases) and to a speedometer, we don't want to alter these readings that's why 50k resistor comes in handy cutting the current it's second role is to secure Zener diode of excesive current. And the diode itself is to cut all the signals that are comming from VSS to Arduino's logics level (5V).
HTH
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ok, but with that approach won't a miss some values of the VSS signal?
That is, suppose i get a 12v signal from VSS (that corresponds to some car reading) the zener cuts it to 5v ok... Now suppose that i get a 8v signal that is a different reading, then zener once again cuts it to 5v? So how I would be able to tell the difference from those 2 signals (maybe i'm understanding the all thing wrong :P)
Tiago