oh, the long wire is connected to nothing. It's around < 1m. No, there's no
"not-so-long-wire". I'm trying to find out how long does the wire need to be
in order to cause problem.

mark


>From: Jan-erik Svderholm (QAC)
><Jan-erik.Soderholm@PAC.ERICSSON.SE>
>Reply-To: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [EE]: Noise problem with schmidt trigger
>Date: Tue, 13 May 2003 13:01:40 +0200
>
>And the long wire replaces what exactly ?
>What's in the other end of the "long wire" ?
>How long is the "not-so-long-wire" ?
>Jan-Erik.
>
>
>-----Original Message-----
>From: Lim KK [mailto:mark_limkk@HOTMAIL.COM]
>Sent: den 13 maj 2003 12:59
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [EE]: Noise problem with schmidt trigger
>
>
>yup, I tried to pull it up, but the problem persist. The output of the
>encoder is pulses (0V to 5V). I think the encoder circuit producing the
>pulses are fine. When I replace the input of the schmitt trigger with a
>long
>wire(1m), the problem appears.
>
>mark
>
>
> >From: Jan-erik Svderholm (QAC)
> ><Jan-erik.Soderholm@PAC.ERICSSON.SE>
> >Reply-To: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
> >To: PICLIST@MITVMA.MIT.EDU
> >Subject: Re: [EE]: Noise problem with schmidt trigger
> >Date: Mon, 12 May 2003 09:10:35 +0200
> >
> >Pull up or pull down resistors on the input to
> >the schmitt trigger ? What is the output from the
> >encoder ? Just a open or closed switch ?
> >
> >Jan-Erik.
> >
> >
> >Lim KK wrote:
> > >The input to my schmitt trigger is actually pulses
> > >coming from an optical encoder.
> >
> >--
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