I've assembled a circuit on a homebrew PCB, it's a datalogger that
outputs data via the USART. The problem is that when I tap or vibrate the
board I get errors in the serial stream. I first suspected loose connections
so I soldered the connectors in place. Well, the errors were reduced but not
eliminated. Any ideas what on could be the root of the problem? Btw, the PIC
and serial port grounds are connected. Also I do have a number of unused PIC
pins that are left ungrounded. Would that be an issue? If so, should I set
the unused pins as inputs or outputs to minimize problems?

Lindsay

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