Ahhh...so doing edge-triggered switching with the mechanical
RPG is not so highly recommended, eh?

I guess I could capture on the edge, then wait in my interrupt
handler until the signal goes high again for a little while.  That
wouldn't kill me; nothing in this system has a high response
speed requirement.  It's just so much easier to use the
external INT interrupt to catch an edge...

Mike H.

>The switches have a maximum bounce time. Using a large
>capacitor at their output smoothes for this length of time, but
>then creates a "tail" which slows down response and makes
>the analog voltage that you don't want. The solution is to
>go back to the smaller capacitor recommended in the
>data sheet, and to sample the inputs at an interval greater
>than the bounce time, but no longer than necessary to skip
>the bounce. Possibly a periodic interrupt from a timer, or
>just waiting for a minimum delay time after reading the
>port pin before reading it again. If each read is separated
>from the one before and after it by a minimum time
>interval, any change detected must be real.
>
>John Power

_________________________________________________________________
Get dial-up Internet access now with our best offer: 6 months @$9.95/month!
http://join.msn.com/?page=dept/dialup

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu