> What happens if the average is 180, and the readings are 178,
> 179, 181 and 182?

Hmmm. OK. We're into the trial-and-error stage of development ;-))

I see what you mean. Results will revolve around any arbitrary
centre point unless compensated

In the example above

(+ 178 + 179 - 1 -2) / 4 =3D 88.5 or
(-2 -1 + 181 + 182) / 4 =3D 90

So.......strip off the centre point to make absolute differences and
then add it back as an offset ?

The obvious answer is 180, which could be arrived at by

(-2 -1 + 1 + 2) + 180

Joe


--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.