Mike,

On Sun, 1 Jan 2006 20:46:51 +0200, Mike Singer wrote:

> Peter wrote:
> > Any switch can have 'noise'. If you have a debouncing routine...
> 
> SPDT + Schmit trigger input + 2 resistors may not need software debouncing.

Yes, but building a keypad/board with anything other than NO contacts is difficult and expensive!  It's fine 
in a high-cost, high-reliability environment, such as ATMs, but not in something with a lot of buttons and a 
sensitive cost.

Cheers,


Howard Winter
St.Albans, England


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