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[wxsig] Humidity and Pressure Sensor Support

Aitor Arrieta aag at aag.com.mx
Mon Feb 14 00:04:19 UTC 2005

Hi Will
Let me offer you our total help to include  our series of sensors to the 
T238. Our door is always open to developers that want to learn more about 
our devices and want to include it on their designs. Our TAI8540A humidity 
sensor is based on the DS2438 +HIH3610 so you shouldn't have any problem. 
The TAI8570 sensor uses two DS2406 to convert from 1-Wire to a special 
protocol needed by the presure sensor. The sensor is a jewel. It's a very 
precise unit and don't need an external power supply. All the needed power 
commes from the 1-wire bus.  Don't hesitate to contact me directly if you 
have any question or if you need anything from us.
Best Regards
Aitor Arrieta

----- Original Message ----- 
From: "William Beals" <will at beals5.com>
To: "'TAPR Weather Station SIG Mailing List'" <wxsig at lists.tapr.org>
Sent: Sunday, February 13, 2005 5:46 PM
Subject: RE: [wxsig] Humidity and Pressure Sensor Support

> Clay:
> That is a simple enough question that I am embarassed to say that I don't
> (and should) have a complete answer for.  I know the sensors I originally
> had and supported, but one thing that has happened over the years is that
> other folk have made similar enough sensors that they did not need any
> different software support and therefore just worked.  I did not keep good
> track of those later sensors.  This has been particularly true for the
> Humidity and BP sensors as those have gone through many designs.
> For humidity, the T238 was designed to work with the original
> Dallas-designed humidity sensor that based on the DS2438 and HIH-3605A.
> Several folk have copied that design.
> For the Barometric Pressure, the design I worked with was the 
> Bray-Jennings
> V3.  This is based on a DS2450 and a Motorola MPX4115A.  This particular
> model requires a separate +12V supply.  I know there have been several
> designs since that have run from lower voltage supplies, but not sure 
> about
> one that is totally bus-powered.  The nature of the Bray-Jennings design 
> is
> that all the T238 looks for is a particuar voltage range to represent the
> "at sea level" BP.  There is a somewhat tricky calibration process you 
> need
> to go through.  As such, the T238 can be fairly well insulated from 
> various
> design changes.
> This is not giving you specific models--which I know you were looking for.
> Based on a previous request I do have a question into AAG about how their
> sensor works, but have not heard back yet.
> will
> -----Original Message-----
> From: wxsig-bounces at lists.tapr.org [mailto:wxsig-bounces at lists.tapr.org] 
> On
> Behalf Of Clay Cottingham
> Sent: Saturday, February 12, 2005 11:01 PM
> To: TAPR Weather Station SIG Mailing List
> Subject: [wxsig] Humidity and Pressure Sensor Support
> Is there a list of supported hardware for the T238 on the site? I couldn't
> find one. I am looking at adding the TAI8540A 1-Wire Humidity Module and
> TAI8570 1-Wire Pressure Sensor from AAG Electronics. If they are 
> supported,
> is there sufficient current from the board to support all of this with the
> rain gauge and standard sensors?
> Thanks!
> Clay
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