I've had the same when i left the power pin disconnected (ds18b20), now
i connect it to ground.
Nico
Martin Patzak (GMX) wrote:
I would check, if the raw data, read from the owfs show that effect or
if it gets introduced later.
In any case it looks like a software bug to me - I could be wrong, but
I don't think so ;o)
Think about what changes you made since your last running system
without the effect.
Martin
On 09/13/2014 02:34 PM, Håkan Elmqvist wrote:
The installation is on a remote island and I can't physically access
it for now. The server since about two months is a Raspberry Pi B+
connected to a wired network. For reliability reasons I have two
DS9490s connected with a USB-hub powered by a 2 A supply. The Pi uses
a separate 1 A supply. I use 0,5 mm^2 twisted pair telephone wires
and soldered connections. The most important sensor, green trace, is
connected with a 1,5 m cable to one of the adapters. The other two
are connected to the other adapter with 3 and 10 m cables. The
sensors use parasitic power.
H
Roberto Spadim skrev 2014-09-13 13:54:
Whats cable distance? Does it use parasite power?
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