> Hi to all,
>
> I like to use rotary encoder and I have a few questions.
>
> 1. connecting A channel to INT0 pin setup interrupt on
>    every falling edge and read B is this valid method ?
> 2. Encoder has 4 possible position and each time when
>    I turn the knob "each small turn" does it go from beginning
>    thru the end or another word does it go
>    00
>    01
>    11
>    01
>
> or it does single step of 4? means 00 only?
> then next turn is 01?
>
> any recommendation ?
>
> thanks
>
> Andre


Because of contact bounce, counting one phase and checking the other for
direction results in some pretty wild counts. Attempts at debounce limit
your rotation speed. I think the best thing is to use an interrupt driven
or polled (often) state machine using the techniques at
http://www.piclist.org/techref/microchip/qenc.htm . I've used these both
interrupt driven in a large 18F project, and polled in a little 8 pin pic
project. They work well!

Harold

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