A /very/ simple and straightforward method of reading a rotary encoding is:

If A is high when B goes high it went one position in one direction.
If A is low when B goes high it went one position in the other direction.

If you want to double or quadruple your resolution you can do so using
one of the many quadrature reading schemes discussed in the past (and
undoubtedly in the future) on this list - search the archives.  If you
don't need the resolution then this is a very simple, cheap way of
reading one.  A little more discussion on rotary encoder types is here
http://www.ubasics.com/adam/electronics/doc/rotryenc.shtml but it hasn't
been updated with info on getting more resolution from them yet.

-Adam

Colin Constant wrote:

> I've just ordered one of those A & B channel mechanical rotary encoders,
> just because I figure it will fit well with a PIC.  Of course, I have no
> idea how to wire this thing up.  Can anyone offer any pointers?
>
> TIA
>
> Colin
>
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