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 >>>> >>>> >>>> >>>> >> ------------------------------------------------------------------------- >> >>>> Take Surveys. Earn Cash. Influence the Future of IT >>>> Join SourceForge.net's Techsay panel and you'll get the chance to >>>> >> share >> >>> your >>> >>>> opinions on IT & business topics through brief surveys - and earn cash >>>> >>>> >> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >> >>>> _______________________________________________ >>>> Owfs-developers mailing list >>>> [email protected] >>>> https://lists.sourceforge.net/lists/listinfo/owfs-developers >>>> >>>> Esta mensagem foi verificada pelo E-mail Protegido Terra. >>>> Scan engine: McAfee VirusScan / Atualizado em 09/01/2007 / Versão: >>>> >>> 5.1.00/4935 >>> >>>> Proteja o seu e-mail Terra: http://mail.terra.com.br/ >>>> >>>> >>>> >>>> >>>> >>> >>> >>> >> ------------------------------------------------------------------------- >> >>> Take Surveys. Earn Cash. Influence the Future of IT >>> Join SourceForge.net's Techsay panel and you'll get the chance to share >>> your >>> opinions on IT & business topics through brief surveys - and earn cash >>> >>> >> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >> >>> _______________________________________________ >>> Owfs-developers mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/owfs-developers >>> >>> >> > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys - and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Owfs-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/owfs-developers > > Esta mensagem foi verificada pelo E-mail Protegido Terra. > Scan engine: McAfee VirusScan / Atualizado em 10/01/2007 / Vers�o: 5.1.00/4936 > Proteja o seu e-mail Terra: http://mail.terra.com.br/ > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
