Quote Originally Posted by BigWumpus
OK,

I use a 100k-resistor in series and it works (yes, a PIC has clamping-diodes).

Am i bad or evil ?
Is this the "proper" way of sensing the state of a 12V source?

I have also seen voltage dividers or transistors used. Whats the best method for a 12V sense? (just detecting on (0V) or off (12V))