Hi Mikko,
There are 2 parts to the answer.
1. -85C usually indicates an error in the slave making the measurement.
OWFS knows -85 is an probably an error and retries the measurement
automatically twice again before returning -85. You said you used another
way of testing with success, can you describe it further?
2. OWFS "polls" by demand only. The request for a reading triggers the
temperature measurement. There is a catch -- caching for efficiency.
Typically you'll get the same result for 15 seconds before the next actual
measurement. You can force a new measurement by reading the /uncached value.
i.e.
/10.12343243223/temperature
v.s.
/uncached/10.12343243223/temperature
Paul Alfille
On Sat, Sep 22, 2012 at 3:50 PM, msopanen <[email protected]> wrote:
> Hi,
>
> My DS1820 sensor is connected using Dallas USB DS9490R adapter to my
> computer
> and I have installed owserver and owhttpd plus related stuff to my Ubuntu.
> I can
> see my sensor from my localhost:2121 port as described in
> http://owfs.org/index.php?page=quickstart-guide but sensor temperature
> does not
> get updated ever but stays on start value 85 all the time. I have also
> installed
> same stuff to my Windows on the same HW and there everything works fine.
> So what
> I'm doing wrong and how I'm able to request new measurement via owhttpd?
>
> Br
> - Mikko
>
>
>
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