AVR-Chat

--- In AVR-Chat@yahoogroups.com, "David D. Rea" <dave@d...> wrote:
> On Mon, 2005-03-14 at 19:43 -0500, Dave VanHorn wrote:
> > Yes, a nice big "L" in the part number, and the crystal is 8 
MHz, and 
> > that's what the fuses are set for.
> 
> What type of crystal are you using? I have experienced wonky 
behavior
> between identical boards after hot-air hand-soldering a SMT crystal
> down. Turns out my hot air rework station was set too hot, and I 
had
> overheated the part.
> 
> Just an idea, on the off chance you're using a SMT crystal...
> 
> Dave

Hi Dave,


Did you have a look at your serial port connections?? all the 
devices are connected over your PC's serial port, if there is a 
ground potential difference you might have your communications 
garbled up.
Can try to put your PC power at the same outlet as the PSU of your 
test boards.You can also have a look if the casing of your serial 
connector 'sparks' if you touched with it to the PC serial port 
ground shield of the PC serial connector.
I have had very bad experience with PC paralel port and printers, 
sometimes a ground difference of 40 VAC!!!!


 Also check your test board PSU, good DC??? , low ripple??, check 
with a scope!!!.

Just a suggestions..

good luck


ron