I don't know about the python code, but you could just truncate the data.
5V / 256 = ~.02 so drop everything after the first two decimal points.
That being said, the 8nit resolution should be faster, which may be
important to you.
Paul Alfille
On Wed, Oct 17, 2012 at 5:02 AM, Attila <bigm...@gmail.com> wrote:
> Hi All,
>
> I'm new with OWFS and Python as well, and working on a project to read
> some temperature sensors. I found OWPython module very handy, and easy to
> use - although now I hit a problem, and Google did not provide an answer
> for me...
>
> I use a DS2450 AD converter to read an RTD sensor using the appropriate
> amplifier circuit. I just realised that 16bit resolution is not true on
> DS2450 (as it is written on its datasheet as well), and values I read out
> with 16 bit is very noisy - simply unusable for me (volt_A, etc). I would
> like to read out the 8bit values instead, which seems much more stable and
> precise - but have no luck doing it from python.
>
> entryList function gives me back this list of entries for DS2450:
>
> ['8bit', 'CO2', 'PIO.ALL', 'PIO.A', 'PIO.B', 'PIO.C', 'PIO.D', 'address',
> 'alarm', 'alias', 'crc8', 'family', 'id', 'locator', 'memory', 'pages',
> 'power', 'r_address', 'r_id', 'r_locator', 'set_alarm', 'type', 'volt.ALL',
> 'volt.A', 'volt.B', 'volt.C', 'volt.D', 'volt2.ALL', 'volt2.A', 'volt2.B',
> 'volt2.C', 'volt2.D']
>
> In owfs, the values are under 8bit/volt.A file - but how can I access it
> using OWPython? seems Python does not accept names starting with numbers,
> so I cannot use anything like
>
> value = s.8bit.volt_A
>
> I'm sure I'm not the only one hitting this, but could not find it
> documented. Can anyone please help?
>
> Thank you very much!
>
>
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