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

Bob kb8tq kb8tq at n1k.org
Thu Jun 8 06:57:41 EDT 2017


> On Jun 8, 2017, at 3:41 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
> 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.

If you go utterly crazy and get into the $1,000 and up “traceable standard” 
thermistors or RTD’s just about everything matters :)


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