Mabey DS18S20s temperature sensors would work better.  They provide a direct
digital output with 1/2 degree C. accuracy.  I've never tried using them in
the same cable with other traffic but I've used them in noisy enviorments
with no problems.  I've had better luck running 5v to them rather than using
parasitic power.


----- Original Message -----
From: "Micro Eng" <micro_eng@HOTMAIL.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, August 30, 2002 8:27 AM
Subject: [EE]:Dallas 1 wire for remote temp monitoring?


> I've been asked by a neighbor (isn't it great when they find out your an
> engineer)if....
>
> Using his ethernet network, CAT5E runs, that goto everywhere in his house,
> and since there is a unused pairs.....
>
> He wants to monitor the temps in the rooms of the house.  I figured using
> the Dallas one-wire system, and the 2N3906 type temp sensors.
>
> But...first off, wouild running this type network in the same cable as the
> ethernet be wise or have no effect on either. Second, each of the signals
> are home-runned, so there is a point where they all come in, but the
lengths
> vary...from 30' to 100' maybe.
>
> comments? A better way to do this maybe?
>
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