> 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

How is it better than just check every 50 ms?

> > > 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?

The ganssle document is nice, but it does not mention down-state
bouncing.

Wouter van Ooijen

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