Hi:

If I used a Normally Open vibration switch as a PIC input it could be 
connected between Vcc and the input.  A high value resistor between the 
input and ground would pull down the input and I think the current used 
would be minimal.

But if a Normally Closed vibration switch is used is there a circuit 
that would not draw current while waiting for vibration?  A coin cell 
will be powering this circuit.  This type (2 ball) is much more 
sensitive to vibration than the spring over rod type that's N.O. See:
http://www.pacificsites.com/~brooke/Sensors.shtml#Vibration

Have Fun,

Brooke Clarke

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