[wxsig] T238+ temp sensor problem

dave k7da at comcast.net
Fri Aug 29 15:19:16 CDT 2014


john what would you want for one of the boards?

dave k7da

On 8/29/2014 11:19 AM, John wrote:
> 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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