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[wxsig] Crashing and random characters

John Koster w9ddd at tapr.org
Tue Jul 22 05:18:31 UTC 2008


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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> 

-- 
73,
John, W9DDD





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