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

Hal Murray hmurray at megapathdsl.net
Thu Jun 8 03:41:29 EDT 2017

attila at kinali.ch said:
> Keep in mind that you will need a good voltage reference as well to reach
> anything close to 12bit. Your LDO is _not_ a good voltage reference
> (depending on type and load/source conditions they vary eaily by 1-2%... not
> to talk about their noise) 

That applies when using a thermocouple.  If using a bridge (or just a 
divider), you can use the same voltage that powers the bridge as the 
reference for the ADC and any drift cancels out.

These are my opinions.  I hate spam.

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