[wxsig] T238+ temp sensor problem

William Beals will at beals5.com
Fri Aug 29 22:30:07 CDT 2014


John:

 

Wow, I can't even think of a good reason why a crystal resocketing would
make sense. Glad it did though!  Hopefully W9DDD John can help out with the
sensor board.

 

will

 

From: John Yost [mailto:k3yjp at yahoo.com] 
Sent: Friday, August 29, 2014 11:34 AM
To: will at beals5.com; TAPR Weather Station SIG Mailing List
Subject: Re: [wxsig] T238+ temp sensor problem

 

Thanks for checking Will.

 

I removed and reinserted the 32MHz osc, had replaced it early on and put new
one in socket, and now all seems to be working as advertised.

 

The X1W-2 board is in pretty bad shape after all the soldering and
re-soldering.  Does any one know of a decent replace module for it, temp and
humidity?

 

thanks

John

  _____  

From: William Beals <will at beals5.com <mailto:will at beals5.com> >
To: 'TAPR Weather Station SIG Mailing List' <wxsig at tapr.org
<mailto:wxsig at tapr.org> > 
Sent: Sunday, August 24, 2014 6:08 PM
Subject: Re: [wxsig] T238+ temp sensor problem


John:

That is a weird one.  I went back and looked at the code and there is
explicit support for both the 1820 and 18S20, but no 18B20.  In looking at
the 18B20 datasheet,  it has a different family ID (0x28 vs 0x10), so the
T238 will not recognize it unfortunately.

As to why the 18S20 is not recognized when everything else works fine, that
is a head-scratcher.  My only theory I can offer is wiring issues (sure you
checked this twice!) or something really weird like not quite enough voltage
on the line--good enough for other sensors but no the 18S20.  Easy thing to
check is having a solid +5V going to the sensors power pin.

will

 


-----Original Message-----
From: wxsig-bounces at tapr.org <mailto:wxsig-bounces at tapr.org>
[mailto:wxsig-bounces at tapr.org <mailto:wxsig-bounces at tapr.org> ] On Behalf
Of
John Yost
Sent: Saturday, August 23, 2014 9:56 AM
To: wxsig at tapr.org <mailto:wxsig at tapr.org> 
Subject: [wxsig] T238+ temp sensor problem

Have had the T238+ running for a long time.  All of a sudden it stopped
reading temperature from the X1W-2 module(temp & RH).

Module looks good, diodes checked ok.

connected a ds18b20 directly to the T238 and it did not read it there
either.

Knowing that the ds18b20 is different from ds18s20, I ordered some fresh
ds18s20 units.
They don't read either.

Reinstalled the firmware, no help.  forced initalize of sensors, no help.

Wierd, it read wind speed/direct, barometric pressure and the clock.

Any suggestions?

thanks
John
K3YJP


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