I've done close to that distance using Cat5 twisted
pair....interestingly enough, the device I was measuring the
temperature of was a large "in window" air conditioner -- lots of EMI!

This setup was parasite powered, for what its worth.

-marc

On 8/2/07, cllow2020 <cllow2020@163.com> wrote:
> Did anyone have try using DS1820 temp sensor connected with shield wire
> for more than 50m distance to controller box and without have AC
> interference ?
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