Do you have a make or schematic or datasheet for your humidity sensor?
Paul Alfille
On Sun, Sep 4, 2011 at 2:28 PM, Miska Sulander <sulan...@jyu.fi> wrote:
> Paul Alfille <paul.alfille <at> gmail.com> writes:
>
> > The humidity sensor as first published in "Sensors" magazine by Dan
> > Awtrey used the HIH-3600 sensor and the VDD and VAD pins of the
> > DS2438.
> >
> > See http://www.elin.ru/files/pdf/1-Wire/humsensor.pdf -- it's nicely
> written.
> >
> > In my naivety I created a humidity file off the main DS2438 directory
> > calculating humidity using this circuit. It confused people who had a
> > DS2438 not set up for humdity (I think they hoped to get humidity for
> > free) but worked with all the extant humidity sensors.
> >
> > Once Honeywell upgraded to the HIH-4000 and others used the HTM1735 I
> > had a bit of a problem. For backwards compatibility the main humidity
> > stayed calculated assuming the HIH3600, but to be accurate you need to
> > know your sensor design and use the correct humidity reading:
> >
> > HIH3600/humidity
> > HIH4000/humidity
> > HTM1735/humidity
> > and now
> > DATANAB/humidity
> >
> > Because the DATANAB identifies itself, I can have the main humidity
> > point to DATANAB/humidity if it's a DATANAB design, and
> > HIH3600/humidity otherwise.
>
> Now, this is somewhat confusing..
>
> I have now humidity over 100% when using HIH-4000:
>
> cat 26.3FDA21010000/HIH4000/humidity: 104.108
> cat 26.3FDA21010000/HIH3600/humidity: 98.9952
> cat 26.3FDA21010000/HTM1735/humidity: 91.5156
>
> So which one is the correct result?
>
>
>
>
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