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 <[EMAIL PROTECTED]> 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" <
[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> 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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