following this conversation loosely, this is a nice write-up on the ADC noise in the uno vs due you might find useful as welk as code mods to analogread()...(not my work). In my experience if an application requires high accuracy and (low noise) you could consider an externally dedicated sigma-delta ADC. Software filtering can only take you so far.
dan@togglebit.net:
Evaluating Arduino and Due ADCsfollowing this conversation loosely, this is a nice write-up on the ADC noise in the uno vs due you might find useful as welk as code mods to analogread()...(not my work). In my experience if an application requires high accuracy and (low noise) you could consider an externally dedicated sigma-delta ADC. Software filtering can only take you so far.
Yes, nice write up. Thanks for that.
We never did resolve my original question though, which was why the ADC reading shifts accoding to unrelated lines of code in the program. I don't like it.
However, I now find I like the DAC output even less - details in a dedicated thread.