I was/have been getting the same 185F temp from the 18B20 in parasitic
mode IIRC. I think I was testing and seemed to notice that it went
away when powering them vs parasitic. I haven't played with much
lately (been testing pH via the DS2450) but I had a script running that
cycled through about 2 to 5 sensors via uncached collecting the temp
and the same sensor would work for a couple iterations, then fail
returning 185F. I could pull it from the net and reconnect then after
restarting script it did the same - work a couple times and die. I
think I had one that after running parasitic, then powering it worked
fine. I was wondering if maybe it was that the sensor didn't have the
power to charge & read correctly due to the multiple successive
calls to the uncached? No real proof or hard evidence, just a thought.
OWFS version= 2.5p10
libfuse-dev version= 2.5.3-2.1ubunt
Ubuntu version= 6.10
Kernel version= 2.6.17-10-server
USB owfs adapter
I don't know the OW net configuration that I had at the time of the
errors, I think they were mostly parasitic temp sensors of some flavor,
and the last one or two read would be the troublesome ones. If you
like I could try to recreate the situation as well.
-Scott
Paul Alfille wrote:
Here's a quick and dirty test with USB, and a bunch of
DS18S20s:
amd64:/home/paul/owfs # owserver -u -p 3000
amd64:/home/paul/owfs # for x in `owdir -s 3000` ; do owread -s 3000
$x/temperature ; done
Data error on /bus.0/temperature
Data error on /settings/temperature
Data error on /system/temperature
Data error on /statistics/temperature
16.9375 16.9375 16.875 16.875 16.875
16.9375 16.875 16.875 16.875 16.9375
16.9375 16.875 16.9375 16.875 16.875 17
16.9375 16.8125 16.9375 16.9375 16.8125
16.875 16.875 16.875 16.875 16.9375 16.875
16.8125 16.8125 17.0625 16.9375 16.9375
17.0625 16.9375 16.9375 17 16.875
16.875 17 16.875 16.8125 16.875 17
16.875 16.875 16.875 16.875 85
16.875 16.75 16.9375 16.875 16.9375 16.8125
16.875 16.9375 17 16.875 17 16.875
16.875 17 16.875 17.0625
16.9375 16.875 16.9375 16.875 17
16.9375 17 16.8125 17 16.875 17.25
16.8125 16.875 16.9375 16.9375 16.9375
16.875 16.875 17.125 16.875 16.9375 16.875
16.8125 16.875 16.9375 16.8125 16.9375
16.875 17 17 17Data error on
/2C.8EF604000000/temperature
16.875Data error on /12.4AE41F000000/temperature
Data error on /12.15DF1F000000/temperature
Data error on /12.F3EA1F000000/temperature
Data error on /01.0683C9090000/temperature
Data error on /01.8660BE090000/temperature
Data error on /01.4FA8CC080000/temperature
Data error on /89.852BC300705E/temperature
Data error on /05.5ADD1E000000/temperature
Data error on /05.DD011F000000/temperature
Looks like one "85" in the mix.
Serial seems to work as well (separate test).
Paul Alfille
On 1/20/07, Paul Alfille <[EMAIL PROTECTED]>
wrote:
There
shouldn't be. That's how it's tested.
Which adapter? Which program? Which platform?
Paul Al;fille
On 1/20/07, Alan Prather <
[EMAIL PROTECTED]> wrote:
Upgraded
to 2.6P0 version and am having trouble getting accurate readings from
my DS18S20 temperature sensors. These are using parasitic power from
the
1wire bus. I get accurate readings from these exact same sensors using
the
Dallas OneWireViewer tool, but in OWFS they are giving me a constant
reading
of 185 degreed Farenheit, or 85 Celsius if I choose that option.
In backreading it looks like this was a problem previously, but not
sure if
that problem persists. Like I said, the readings are accurate using
the
Dallas 1-Wire Viewer tool, so I have to believe the sensors are
functional.
Is there still a problem with this sensor model in OWFS?
Thx,
Alan
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