quadrature rotary encoder to inc and dec buttons

[cyborg0 at GlobalEyes.net]

Ok, well, I figgered out how to convert the 90 degree out of phase A and
B outputs of  a panasonic rotary encoder knob to trigger properly..No
easy fix here, it was prolly the MOST difficult thing I have ever had to
do, and before it was all done, I had a design based on a 2 to 1
decoder, a D-flipflop, and one based on an RS flop with reset.

I guess what the hardest part about using the flipflops is finding a way
so that the status wont change on the flip flop after the direction of
the knob has been set..It was really difficult to keep it from
retriggered the flop when one continued turning in the same direction. I
solved the problem finally!

    I would like to have these pulses go to a bilateral switch that is
in parallel with the switches that now control the inc and dec
functions.. I would like them to remain functional, too.. I want the
processor to see both the inc/dec switches being pressed and the turning
of the encoder left/right as the same thing, respectively. Does anyone
think that the bilateral switch might have too much resistance to do
this correctly? I figure it will probably work...

    BTW, this little encoder knob retrofit will be really cool for other
types of gear too. Im kinda wondering if there is a way to retrofit my
Drumstation (wow they will have to be really small!) or my Nord Lead..
these alpha dials are really neat. Maybe when I do the final I will use
those really neat (and expensive) Greyhill encoders like they have on
Lexicon gear. :))

Rob