Best article I've ever read about Debouncing, and it has the best algorithm
I've ever seen as well.

http://ganssle.com/debouncing.pdf


On 12/31/05, Wouter van Ooijen <wouter@voti.nl> wrote:
>
> > > There's no need to debounce switches unless you poll them faster
> > > than the bounce time. And the only reason you'd need to poll them
> > > that fast is if you need low latency, like with a trigger. I
> > > generally poll 20 times per second and that works just fine.
> >
> > This is fine if you're only worried about bouncing on
> > transitions.  If you
> > are doing filtering or the switch could bounce in one of the
> > states (like a
> > momentary pushbutton), then you need to sample faster and
> > apply debouncing
> > or filtering logic.
>
> This is new to me. You say a pushbutton (lika an ordinary keyboard key)
> could bounce *while being pressed down*? And if so, how would you
> recognise such a bounce?
>
> Wouter van Ooijen
>
> -- -------------------------------------------
> Van Ooijen Technische Informatica: www.voti.nl
> consultancy, development, PICmicro products
> docent Hogeschool van Utrecht: www.voti.nl/hvu
>
>
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--


Shawn Wilton (b9 Systems)
http://black9.com
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