Re: LM35 - Length of cable ?

["Dave McLaughlin" <dave@xxxxxxx>]

Mark,

My weather station has about 20ft or so of 4 core unscreened and it
works
fine. There is a small amount of noise but by averaging samples I get a
better readout. Only changes by about 0.1 of a degree and considering
the
accuracy of the LM35 this is acceptable anyway.

Once I get my act together I will have a CAN bus based sensor interface
that
should alleviate this problem and allow you to make runs as long as
500m
without problems of noise. I already have designs that can read digital
data
but not yet with the analog.

Dave...

----- Original Message -----
From: "Frank Mc Alinden" <armagh@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, May 31, 2002 12:30 PM
Subject: Re: [ukha_d] LM35 - Length of cable ?


> Mark
>         If its only 20
ft  the 4 core security cable would work . I dont
> imagine you would be that unlucky .
>
> Frank Mc
> ----- Original Message -----
> From: "Mark Marooth" <MMarooth@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Friday, May 31, 2002 9:19 PM
> Subject: Re: [ukha_d] LM35 - Length of cable ?
>
>
> >
> >
> > Hi Frank,
> >
> > Runs should be no longer than 20 feet through the roof
space.  You've
also
> > confirmed what I suspected about noise, as I am running thorugh
roof
> space,
> > think I'll use something shielded.
> >
> >
> > Mark




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