I use an interrupt on a change on encoder count pin and inside the ISR I
check the quadrature bit to see if I count up or down.

Hope this helps
Francisco

Marty wrote:

>Hi All,
>
>I have just purchased some 2 bit rotary encoders which i'd like to use in my
>pic projects (scrolling thru LCD menus etc etc)
>
>There are 2 output pins, being out of phase by 90degrees (1 leads, 1  lags)
>to indicate the direction of rotation.
>
>Is there some picbasic code to read the direction of the encoder?
>I've tried a few things, but it seems to count up,up,up no matter which way
>i rotate.....i obviously need more of a bitwise arithmetic to identify the
>bits and direction.
>
>I have seen a cicuit sometime ago, where the rotary encoder 2 bits feed into
>some EXOR gates, and then the 2 EXOR outputs would feed an up/down binary
>counter (cmos 4000 ic's)...i'm trying to elimintae the cmos, and perhaps
>need to do the EXORing inside the pic ????
>
>Any help is welcomed.
>Marty. (pic 16F84 & 16F877 used here)
>
>
>
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