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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