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[wxsig] Humidity and Pressure Sensor Support

William Beals will at beals5.com
Mon Feb 12 04:21:32 UTC 2007


Folks:

In talking with John, it appears that AAG have made some significant design
changes to the TAI8570 pressure sensor.  They are now using different 1-wire
devices that the T238s do not support.

will

-----Original Message-----
From: wxsig-bounces at lists.tapr.org [mailto:wxsig-bounces at lists.tapr.org] On
Behalf Of John Vause
Sent: Sunday, February 11, 2007 10:19 AM
To: TAPR Weather Station SIG Mailing List
Subject: Re: [wxsig] Humidity and Pressure Sensor Support

Can someone has the TAI8570 pressure sensor working with the T238 and
original Dallas wind sensor (wind dir/speed) and rain gauge please email me
how they did it.

I've upgraded my T238 to 1.15.8R firmware but it doesn't detect the TAI8570.

Thanks.
Clay Cottingham wrote:
> Phil -
> 
> I have the 8570 running and, as you said, had to re-wire it to make it
work.
> Thanks!
> 
> The spec sheet on it states that it has calibration data that needs to 
> be downloaded to the host and used to calculate true pressure. I 
> notice that it is reading 1.87 inches low compared to the local 
> airport. Are you having to correct for yours?
> 
> Thanks,
> Clay
> 
> -----Original Message-----
> From: wxsig-bounces at lists.tapr.org
> [mailto:wxsig-bounces at lists.tapr.org]On Behalf Of Phil Reid
> Sent: Sunday, February 13, 2005 11:09 PM
> To: TAPR Weather Station SIG Mailing List
> Subject: RE: [wxsig] Humidity and Pressure Sensor Support
> 
> 
> 
> Hello all,
> 
> Utilizing RJ-11 connectors, the one-wire bus should be as follows ....
> 
>  	pin 2	--	ground
>  	pin 3	--	1-wire data
>  	pin 4	--	1-wire ground
>  	pin 5	--	pwr +5 VDC
> 
> When I first assembled the TAI8515 ver. 2.0, with the T-238, it 
> required pin 2 to have power and pin 5 to be ground. I modified the 
> T-238 to match the TA8515. This was an error. I should have modified 
> the TAI8515 to match the T-238 which is layed out correctly for the
one-wire bus.
> 
> Acquiring the TAI8570 and putting it on the modified one-wire bus, I 
> got the same message Jerry received, and scratched my head for a 
> couple of hours.
> 
> I acquired the RJ-11 connection specifications for each device and I 
> realized what had taken place.
> 
> I returned the T-238 to its original design, and modified the TAI8515 
> to match.
> 
> I now have the T-238 with the latest firmware, supporting and powering 
> the TAI8570/Barometer, TAI8540/Humidity, TAI8585/Counter with rain 
> gauge, and a TAI8515/Anemometer, all on the one-wire bus.
> 
> 73's     phil/w7oze
> 
> 
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> 
> 
> 
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> 
> 

-- 
* John Vause  KF4ERV  jdv at iglou_dot_com                *
* NOTE: email address altered for benefit of Spambots *
* My favorite law: The Law of Unintended Consequences *
*                         - John Vause                *
--

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