I have a sensor, that when its activated, it goes from a 15ohm to open circ=
uit.  This is a battery powered device, so low current is critical. It will=
 bounce back and forth, as its a motion detector of sorts.=20

The approach I was going to take (and build up to test later) is to put a 3=
30K resistor in series being fed by the box 3.3V power, and connect the A/D=
 of the PIC between the sensor and the resistor.  Normally it will pull som=
e small amount of current and thus a voltage drop to measure, and on a open=
 circuit if course it should read zero.

Any other ideas on measuring for an open circuit with very low power consum=
ption?


     =20
--=20
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