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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