Re: LM35 - Length of cable ?

["Frank Mc Alinden" <armagh@xxxxxxx>]

Hi Dave
            Whats
the difference between rs485 comms and the Can bus ? is it
the protocol . I see Microchip have can bus chips. Are they easy to
use?
Some of the industrial (Allen Bradley) plc suppliers use the can bus
system.
What are the advantages?

Frank Mc
----- Original Message -----
From: "Dave McLaughlin" <dave@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, May 31, 2002 9:55 PM
Subject: Re: [ukha_d] LM35 - Length of cable ?


> 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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