I am building a project that fits into an empty computer bay and is powered
from the computer's power supply.  This is done off of a 12 volt line and
through a 7805 -> which provides the 5V for the PIC to run on.  Now, I plan
to set up voltage dividers between the computer's 5 volt line and ground,
and the 12 volt line and ground.  This way I can use the A/D inputs of the
PIC to monitor the computer's power supply voltage.  This is done by
choosing resistor values that provide monitoring voltages at 2.5 volts for
each of the two lines being monitored.  This is done to allow for the
greatest fluctuation in the power supply voltage, whereby I can still
monitor it without 'clipping'.

==>  My question is, should I worry about sensing a voltage that is
providing the power to my PIC to start with?  Remember, I am monitoring a 5
& a 12 volt line, and this 12 volt line is the same one that powers my PIC
through a 7805.



Thanks,
Brandon

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