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[wxsig] Barometer calibration

William Beals will at beals5.com
Sat Jan 12 21:04:49 UTC 2008

K3YJP John:

Just following up (I was on a business trip last week) to see if things are


-----Original Message-----
From: wxsig-bounces at lists.tapr.org [mailto:wxsig-bounces at lists.tapr.org] On
Behalf Of John Bennett
Sent: Thursday, January 10, 2008 8:15 PM
To: TAPR Weather Station SIG Mailing List
Subject: Re: [wxsig] Barometer calibration

Was it working at one time? If not, then I would suspect you've fallen
into the AAG 'Version 3.0' trap. It has to do with AAG swapping Vcc and
ground around. When you connect the original wiring (which the T-238 and
T-238+ only support) to a 'Version 3.0' everything will die. The
backlight on the display is powered independently of the rest. Check Vcc
on your board and see if it is in the range of 4.75 - 5.25 volts. If it
is near zero, that's probably the cause. This issue has come up repeated
times on this mailing list. There should be something in the archives on

73, John

On Thu, 2008-01-10 at 18:42 -0800, John Yost wrote:
> Well, the barometer calibration is not a problem at
> the moment.  There is still something a miss, as it
> still wants to be 1040mb when it should be 1020mb. 
> Yes I screwed up the cal procedure more than you can
> believe, but the last two times I believe I followed
> it properly.
> Bigger problem now is the T238+ is dead.  The last
> time I connected the X1W-1 I also connected the X1W-2,
> which had been previously tested and working, the T238
> lcd backlight is all I get.  Voltages are ok.
> Have I fried the processor chip?
> john
> Be a better friend, newshound, and 
> know-it-all with Yahoo! Mobile.  Try it now.
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John Bennett
Evansville, IN
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