>Can anybody advise me if they know of any successful efforts to use a PIC to
>interface to a rotary encoder to give a reading of angular resolution and
>direction.  I guess this would involve some sort of phase shift measurement.
>Any help would be very much appreciated.
>Regards  Kim Turner.

Back in the old days of the 68705P3 I used a 7486 to generate a low going
INT pulse whenever there was any change in pulses. The service routine
read the parallel view of the current 2 phase input, used this as a jump
table to an INC or DEC routine. This allowed 7 segment output whilst
acquiring position to as many bits as required on interrupt.  With a 2MHz
MC68705P3 I managed about 4KHz input without any loss of position and
7 segment multiplexing.

I'm sure a similar technique could easily be used for the PIC...

Rgds


Mike