Hi

This document you just pointed out, http://ganssle.com/debouncing.pdf, also
describes RC fileter as quite efficient (Page 12, RC debouncers). 

There is quite obvious, significant improvement from last nite, on my board
at least. However, as you said - it's not exactly perfect. 

Any thougts about MC14490 (Contact Bounce Eliminator)? It's around 3.5 USD a
piece (on their web site): 

https://www.onsemi.com/PowerSolutions/product.do?id=MC14490 

Is that much better then simple RC filter which I tested (by Jinx
suggestion) with interrupt service routine? 

Thanks,
r. 

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Rolf
Sent: Sunday, January 08, 2006 5:03 PM
To: Microcontroller discussion list - Public.
Subject: Re: [PIC]18F452 interrupt service routine

Someone posted this a while back, and I found it exceptionally useful.

The author concludes that there is only one hard-ware mechanism for a 
reliable debounce, and that there are few good software versions.

Additionally, there is no such thing as a bounce-free switch.

An RC mechanism is not reliable.

I have recently implemented a mechanism for 4 buttons based on his 
recommendations, and it has been very reliable.

http://ganssle.com/debouncing.pdf

Rolf





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