gnupic: Re: [gnupic] help - weird intermittent resets
Subject:
Re: [gnupic] help - weird intermittent resets
From:
David McNab ####@####.####
Date:
30 Jul 2005 13:39:11 +0100
Message-Id: <42EB74E3.2010207@rebirthing.co.nz>
Greg Hill wrote:
>> Sounds very much like a problem I had many years ago with a Z80 board
>> running at a comparatively slow 4MHz. Ground and power traces were way
>> too narrow, causing relatively high ground/Vcc resistance and lots of
>> generated noise. Memory would get randomly corrupted, resulting in
>> random resets.
> I built a board with a 16F876 a year or two ago with exactly this
> problem. I'd etched the board myself at home, and the ground traces in
> particular ended up a little too narrow by the time everything else on
> the board finished etching. I was able to confirm and correct the
> problem by soldering a length of 30 ga wire wrap wire from the ground
> point of every IC back to the ground connection for the board, in a star
> configuration (rather than a bus configuration). Once I put those extra
> ground wires on, everything worked reliably. Later I remade the board
> with wider traces, and this one worked fine without need for extra
> ground wires.
I just now soldered some ground wires from the ground pins of the PIC
and the LCD module, as well as the ground side of the capacitors on the
crystals, to the ground lead coming in from the battery.
However, it's made little or no difference.
I haven't seen this happening on breadboard or veroboard circuits, so I
can accept that there's some electrical crap going on.
I'll create a new PCB artwork, flooding the ground traces to all unused
areas of the board, and see if that makes any difference.
Cheers
David
