> useful for. When the switch is activated by this moving piece
> of machinery it can alert the PIC a couple of ways.

Oh, another way I meant to mention was using an RC to store
the event. That way you could use a general purpose I/O pin

Set the pin as an input, C to ground and R to 5V via the switch.
When the switch closes the C will charge up and record the
closure. You can read this when your code has time. Set the
pin to an output and "0" to discharge the cap. It shouldn't need
a very big cap to do this, maybe a few nF. It depends on how
long the switch is closed for. Discharging C through a resistor,
a couple of hundred ohms, would be safe

                     R to 5V through switch
                      I
pin --- R ---- C to 0V

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