Have you tried another channel on the DS2482-800 for the long run? The 8
channels are electrically separate.
I assume you've looked at some of the resources for 1-wire bus topology,
like http://www.maximintegrated.com/en/app-notes/index.mvp/id/148
Paul
On Fri, Jan 2, 2015 at 10:08 AM, Jan Sennesael <jan.sennes...@skynet.be>
wrote:
> I have a plugin board running on top of my pi containing a DS2482-800 and
> an
> 2482-100 master. Both are connected through I2C.
> The DS18b20's that are connected are connected in bus layout and are
> powered
> (not parasite)
> Everything was running fine, but when i tried to add a couple of sensors i
> run into some troubles: Since these sensors are on the other side of the
> house, is added a long utp cat5e cable (long= 25m a 30m) to the first
> sensor. However, if i connect the sensor the whole channel of the
> DS2482-800
> stops working. If i disconnect it, the rest works again.
> I guess that there is already around 30m active. (so the total distance
> between the master and the new sensor is around 60m
>
> Since the cabling is ok i am guessing the total cable length is to long.
> Is there anything to solve this problem? (pull up resistor or cap?) Would
> the 2482-100 be better at this? I didn't use it since this one draws power
> from the pi and the -800 is externally powered (board layout issue...)
>
> Thanks
> Jan
>
>
>
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