Clocking crystal. (electro mechanical part sensitive to vibration)

WBR Dmitry.


Lindsay Pallickal wrote:
>
>     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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