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[wxsig] Crashing and random characters

Guy Story KC5GOI kc5goi at gmail.com
Wed Jul 23 22:19:41 UTC 2008


John Koster wrote:
> Would there be useable date codes on the MCU chips.  Tracking those 
> against problems might be helpful.  
>
> On Mon, 21 Jul 2008, William Beals wrote:
>
>   
>> Guy (and all):
>>
>> Let me digest this for a bit.  While I don't know of it, there is a chance I
>> do have something on the edge from a timing or voltage level standpoint that
>> is going over the edge on the newer chips.
>>
>> will
>>
>> -----Original Message-----
>> From: wxsig-bounces at lists.tapr.org [mailto:wxsig-bounces at lists.tapr.org] On
>> Behalf Of John Bennett
>> Sent: Monday, July 21, 2008 7:48 PM
>> To: TAPR Weather Station SIG Mailing List
>> Subject: Re: [wxsig] Crashing and random characters
>>
>> John Koster wrote:
>>     
>>> So am I drawing the right conclusion?  The processor chip from the T238+
>>> kit was bad?
>>>
>>> On Mon, 21 Jul 2008, Guy Story KC5GOI wrote:
>>>
>>>       
>>>> I wanted to let the list know what I have found out and it took some 
>>>> patience.  I took advantage of the fact that the only difference between 
>>>> the older kits I have been using and the newer kit was the circuit 
>>>> board.  It reduced the variables.  I have had faith in the code that has 
>>>> been released so I started there.  Since the microprocessors are the 
>>>> same throughout the projects life span, I took a microprocessor that has 
>>>> been running for multiple years and flashed it to the Wills most current 
>>>> version and placed that on an older board.  One week later I still had 
>>>> the heart beat.  That ruled out sensors, cabling, code, older board (I 
>>>> could duplicate the crashing problem on the newer processor on the older 
>>>> board) and pointed to the processor.
>>>>
>>>> I then swapped the processor to the current circuit boards, everything 
>>>> else the same.  Ten days later I still have the heart beat and readings. 
>>>>
>>>> I am not sure how soon I can get it back in service but W5NGU-3 will 
>>>> soon start to give wx data from 300ft again. 
>>>>
>>>> There is one fatality, the baro sensor is not reverse polarity 
>>>> protected.  I am sure that is already known but just encase someone sees 
>>>> this post and does not know it, I am putting it in.
>>>>
>>>> 73
>>>>
>>>> Guy
>>>>
>>>> _______________________________________________
>>>> wxsig mailing list
>>>> wxsig at lists.tapr.org
>>>> https://lists.tapr.org/cgi-bin/mailman/listinfo/wxsig
>>>>
>>>>         
>> Wow. A bad MCU is not unheard of, but not in the quantity this would 
>> indicate. I wonder if Motorola, in their infinite wisdom, changed some 
>> of the timing parameters on writing to the EEPROM in a revision of the 
>> chip. Might be worth looking into. I would sooner think that than a bad 
>> bunch of MCUs.
>>
>> John
>> n4xi
>>
>>
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>>
>>
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>>
>>     
>
>   
Let me look at what I have.  I think I just have a goofed up chip.

Guy




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