[wxsig] T238+ temp sensor problem

John w9ddd at tapr.org
Fri Aug 29 13:19:59 CDT 2014


Do you have an original, or a rev2 X1W-2?  I have some bare PCB, but they may 
be the original PCB and not the rev2.  I'll have to dig them out to be sure.

You can determine which version you have by looking at the manuals at:

http://www.tapr.org/kits_x1w-2.html

On 8/29/2014 12:33 PM, John Yost wrote:
> 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>
> To: 'TAPR Weather Station SIG Mailing List'<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] On Behalf Of
> John Yost
> Sent: Saturday, August 23, 2014 9:56 AM
> To: 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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-- 
John, W9DDD


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