I didn't read your message carefully.
"Are you using a dedicated onewire host adapter chip or just a simple
GPIO pin? For the latter you have to connect the pullup to 3.3V, not 5V."
I am connecting from the DS18B20 to cat6 to the MS-TV.
I am not using the GPIO. Don't know how. I have other sensors on another
Raspberry, all connected via LinkUSB and Cat5 wire.
As you can tell I am not very savvy with this stuff.
This old man thanks you for your help.
Peter
On Tue, Mar 1, 2016 at 12:11 PM, Jan Kandziora <j...@gmx.de> wrote:
> Am 01.03.2016 um 19:48 schrieb Peter Hollenbeck:
> >
> > The new temperature sensor is connected with 150 feet of waterproof Cat6.
> > When trying to get it working I read that the DS18B20 needs a 4.7K
> resistor
> > connecting +5V to Data.
> >
> Are you using a dedicated onewire host adapter chip or just a simple
> GPIO pin? For the latter you have to connect the pullup to 3.3V, not 5V.
>
>
> > I lost the resistor that came with the sensor so used 5 1K resistors in
> > series instead. (Am at a remote location and must use what I have at
> hand.)
> >
> > Q1: Is the cable too long?
> >
> No.
>
>
> > Q2: Is 5K okay instead of 4.7K?
> >
> The pullup may provide up to 4mA. That's the maximum the inidividual
> slaves can pulldown. So at 3.3V, it may be as low as 1k.
>
> Make it 1k and connect it to 3.3V.
>
> Kind regards
>
> Jan
>
>
>
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