On Tue, 28 May 1996, Mark K Sullivan wrote:

> I always use 20 mS as a rule of thumb for switch bounce time.  One of the few
> things PICs do poorly is waste time.  How much time did your loop take?  At
 any
> reasonable clock rate, the PIC executes 255 iterations in far less than 20 mS.
> Your approach is fine, but you need to make sure the delay is at least 20 mS.
> The only problem arises if you need to be doing something else while you are
> timing the switch.

Unless, that is, you have enough other things to do!  In which case you
might be able to put them all into a "great mucking big loop" that
executes, oh, say 60 times per second, and you can run a very simple
debouncing state machine for each switch input on each cycle, and sample
the other sensors, etc, etc.

But sometimes I wonder: is the the result of having once learned a little
bit about RPG, or does everyone doing interactive interfaces end up
reinventing the event processing loop eventually?  ;-)