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List: owfs-developers
Subject: Re: [Owfs-developers] HUMIDITY
From: Roberto Spadim <roberto () spadim ! com ! br>
Date: 2007-01-11 5:20:32
Message-ID: 45A5C920.2080109 () spadim ! com ! br
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sorry R$300 for HIH4000, R$29 for HS15P
USD 1=R$2.2
HIH ~=136.36 (with tax :(, and tax~= 18%!!!)
i don't know why but honneywell here in brasil is about 100% more
expensive than another country :/
Paul Alfille escreveu:
> Aagelectronica sells a humidity sensor for $44, and Hobbyboards for
> $48. Also, the humirel part might be cheaper, and is supported.
>
> Still, if you build a circuit for the HS15p, we'll try to support it.
>
> Paul
>
> On 1/10/07, *Roberto Spadim* <roberto@spadim.com.br
> <mailto:roberto@spadim.com.br>> wrote:
>
> in USA you wil have no problem with honneywell, but in brazil: hih
> ~$300, hs15p~$29 got the main problem?! :)
> i think that using an external source voltage could help, dont? we
> have
> an device that can read current volt and temperature in same
> package (i
> don't know if read current and volt at same time it should.. or we
> will
> not work with external souce)
> ds2438 i think that's it, i don't remember now, but it have 2.4V-10V
> input ADC and an current input ADC
>
> ziggy escreveu:
> > I've used the HS15P before on a PIC. It's not going to be easy
> to interface to 1 wire. The big requirement is that the sensor can
> *not* have a standing DC voltage across it, or you will destroy
> the sensor. As it says in the datasheet: AC voltage 50 Hz to 1kHz.
> You may be able to place this across the outputs of a DS2406 and
> toggle the PIO states emulating AC. Then with the proper side in
> high state, make a measurement with an ADC and finally turn off
> both PIOs on the 2406 leaving the sensor with no applied voltage.
> You would have to place a resistor in series with the sensor, 27k
> or so, to make the voltage divider for the ADC. Don't know if the
> 2406 will actually work properly for this, it's just an idea.
> >
> > In ASCII art (fixed width font) it would look something like:
> >
> > ADC----------------
> > |
> > HS15P | 27K
> > PIO-A ---/\/\/\/----/\/\/\/---|
> > PIO-B ------------------------|
> >
> > Simplest solution is still to use a linear output sensor that
> you can measure with one of the ADC chips. This could be a
> Honeywell HIH-3610/HIH-4000, a Humirel HTM1735, an Ohmic HC-610,
> etc. These also have better accuracy (most +/- 2%) than the HS15
> (+/- 5%).
> >
> > Paul
> >
> >
> > On Wed, 10 Jan 2007 10:10:16 -0500, "Paul Alfille"
> <paul.alfille@gmail.com <mailto:paul.alfille@gmail.com>> wrote:
> >
> >> Interesting sensor. Is it part of a 1-wire circuit, or were you
> going yo
> >> try
> >> to construct one?
> >>
> >> The give "Typical response curves" -- but we'd need to do some
> >> curvefitting
> >> to make a formula.
> >>
> >> Paul
> >>
> >> On 1/10/07, Roberto Spadim <roberto@spadim.com.br
> <mailto:roberto@spadim.com.br>> wrote:
> >>
> >>> founded!
> >>> http://www.thermometrics.com/assets/images/hs1215p.pdf
> >>> now i'm trying to learn how to read :)
> >>> maybe anyone can put it in owfs for us :) with some ad convert
> >>>
> >>> Roberto Spadim escreveu:
> >>>
> >>>> hi i'm with an KEYSTONE THERMOMETRICS - HSP15P
> >>>> Humidity Sensor, but i don't know how it works :/ anyone have the
> >>>> datasheet or worked with it? maybe putting it with owfs could
> help,
> >>>>
> >> it's
> >>
> >>>> an verrrry cheap humidity sensor
> >>>> tahnkx
> >>>>
> >>>>
> >>>>
> >>>>
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