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[DPRG] Re: 1-wire keypad

Subject: [DPRG] Re: 1-wire keypad
From: Ralph Tenny rten at metronet.com
Date: Mon Jul 2 20:43:29 CDT 2001

Mike:
When you refer to keypad, do you mean just the hardware, or a keypad with
debounce circuitry?

My experience leads me to believe there is no such thing as a keypad
without debounce circuitry that produces a clean, bounce-free output.
Ralph

On Mon, 2 Jul 2001, Mike McCarty wrote:

> Since you don't post a schematic, it is difficult to say.
> 
> In any case, keypads should be very clean, producing exactly one output
> per keypress. Your keyboard on your computer is just a large keypad, in
> effect. Of course, you probably won't be implementing roll over.
> 
> Mike
> -- 
> char *p="char *p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}
> This message made from 100% recycled bits.
> I can explain it for you, but I can't understand it for you.
> I don't speak for Alcatel      <- They make me say that.
> 
> On Mon, 2 Jul 2001, montgomery f. tidwell wrote:
> 
> > Howdy,
> > 
> > i contacted Jeff Corr and he said that the image was lost long ago.
> > 
> > i did manage to get something "working", but the data is not very
> > clean. as i'm pressing a button the values seem random. once pressed
> > and held one (or two) value(s) are output. as the button is being
> > released it starts giving random results again.
> > 
> > is this (a) the nature of keypads, (b) an indication that my keypad
> > is not the best, (c) or there is something that i should be doing
> > to "clean" up the output, if so what?
> > 
> > 
> >                               \\//_
> > 
> > 
> > Mike McCarty wrote:
> > > 
> > > On Sat, 30 Jun 2001, Larry Kerns wrote:
> > > 
> > > > I believe the circuit is located at:
> > > >
> > > >     http://www.gorobotics.net/onelinekeypad.shtml
> > > 
> > > Unfortunately, this site has broken links, including the schematic.
> > _______________________________________________
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> > http://nimon.ncc.com/mailman/listinfo/dprglist
> > 
> 
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