Em 2/5/2010 17:29, Youda He escreveu:
> This is a redesign of existing product, used in dusty environment, for
> ramping up/down current and voltage setting.
> The existing design use a roller switch for this (so you don't have to
> click on up down arrow thousands of times)
> Very much link the stereo equipment volume dial, the existing roller
> goes bad easily...
>
> I am trying to find a better replacement.
>
> -- Youda
>   =


Use the optical quadrature encoder from a mouse, plus a small PIC to
decode the signal and simulate the original switch.

Isaac

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