The voltage sensor is just a resistor divider, I just measured the resistance of it to 37.5K. I may add the diodes or, I may look for a voltage divider with a higher resistance. As for the micro controller and the HV power supply those will be ran off of either the 12V cigarette lighter or a the 12V supply that is connected to the computer or the lights, so that the gauges come on when the car does. I’m not too worried about their power supplies as I tested a nixie clock on the 12V cigarette lighter and it was fine even when starting the car 4-5 times. My theory was if you can change a cell phone on it with no problems I don’t see why you couldn’t run a 5V and HV power supply on it. I believe I was correct as it worked. I may try to run the voltage sensor off the 12V cigarette lighter, and see if I get a reading of 13V or 12V, if it’s 12V then I know that it’s not the true battery voltage. If it’s 13-14V then I know that it is the true battery voltage, or close enough at least.
Sent from my iPhone > On Feb 11, 2019, at 14:13, gregebert <[email protected]> wrote: > > 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 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. -- 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/14B27CC9-1CF4-4639-A79C-E260F69C8BD9%40gmail.com. For more options, visit https://groups.google.com/d/optout.
