Re: Measure 10-15 volts ***accurately*** (was Re: AD with 12F675 fluctuations) | Piclist

A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.

The first problem is your requirements. Do you want .01 volt accuracy or .01 volt repeatability at 15 volts? If you want .01 volt accuracy, then your resistors need to be .01/15 or better than 0.06% and a 12 bit AtoD. Also your reference has to be that accurate. Chad --- d1camero <> wrote: > Thanks for all the input. I have tried your suggestions (averaging, > capacitors, sleeping) without any appeciable change in fluctuation. > > BUT, when I removed the resistor divider network, and simply used > the 12F675 to measure 0-5volts, the ADC works great, with an > acceptable 1 bit fluctuation. > > So my question has changed: How can I accurately measure 10-15volts > with the 675. Obviously a 1% resistor divider network introduces > too much noise. Other ideas? > > thanks > d1 ===== My software has no bugs. Only undocumented features. __________________________________

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Discussion Groups | Piclist | Re: Measure 10-15 volts accurately (was Re: AD with 12F675 fluctuations)

Re: Measure 10-15 volts accurately (was Re: AD with 12F675 fluctuations) - Chad Russel - Apr 10 2:07:00 2004