[time-nuts] Poor man's oven

Riley, Ian C CTR NSWC Philadelphia, 515 Ian.Riley.ctr at navy.mil
Tue Jun 6 10:00:17 EDT 2017


> The trick with using a uP and it's built-in A/D converters is scale.  You
> want the limited 10-bits of revolution to fall over the operating range
> which is very narrow, like 1C.   Anything outside of that is either 0000 or
> 1111 and only seen at start-up.,  So at start up the the controller is on
> "bang-bang" mode then later you have milli-degree resolution over your 1C
> range.   Basically you are measuring noise. but your $2 uP can take 100,000
> measurments per second and putt tour a digital filter.

I have seen but not used the AREF pins on Arduino and similar uPs; as you lower AREF, do you lose any sort of accuracy? Is there a practical minimum for what voltage you can feed into AREF? 

-Ian R. 

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