Be extra careful about ESD/surge events; the automotive electrical environment is quite nasty, especially in older vehicles that have mechanical voltage regulators. Depending upon where you tap the power & ground, your circuit can be affected by large di/dt events, such as starting, charging, A/C compressor cycling.
A volt-sensor is probably just a resistor-divider to shift the voltage down to a level that can be safely read from a GPIO pin; probably not a full-on A/D converter. If the resistor values are in the 100K range, or higher, you wont have to worry about ESD or reverse polarity. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/b7b67ff7-6029-4ef6-af35-42419a233efe%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
