Bob Axtell wrote:
> Averaging is really the best way to get better A/D..
>
> I average 4 samples, once per second. The structure is a bucket
> with a hole in it; when the new sample goes into the bucket, the
> oldest drops out. I then shift twice to get the average.

Averaging is one way to get more resolution from multiple readings of a
continuous stream, but rarely the best.  Note that the average you describe
is really a box filter, which is a sinc function in frequency space.  I
usually use a 1 or 2 pole low pass filter, which is very easy to compute and
requires less state than an average.


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