[time-nuts] uC ADC resolution (was: Poor man's oven)

[Chris Albertson]

On Tue, Jun 6, 2017 at 2:17 PM, Attila Kinali <attila at kinali.ch> wrote:

> On Tue, 6 Jun 2017 16:37:27 -0400
> Bob kb8tq <kb8tq at n1k.org> wrote:
>



> . Heck, the STM32F4xx have so much internal noise that the ENOB
> of their ADC is below 6bit... so low that they even had to write an
> appnote on how to do averaging to get back to the 12 bits the ADC is
> spec'ed for. (but don't mention that to an ST sales person, they will
> hate your guts afterwards).
>

Can you actually get back all of those bits?   How many samples would you
need?   My current use case for the STM32 ADC is to track battery voltage
and maybe 6 bits is enough but if I can get to 12 with a software-only fix
I'll take it.  Batteries volts charge slowly so I'd have time to take many
samples.   It's a rather mundane application.  Controlling a battery
powered motor and I can't let theLiPo battery dichange below a limit so I'm
sampling voltage at 1Hz.   Got a link to or the name of the app note?

>
>
-- 

Chris Albertson
Redondo Beach, California