Good thinking. Do you also keep the pin an output and low untill you need t=
o read the switch? In a worst case (induced noise) scenario it would keep t=
he voltage on the pin from floating around and possibly entering the analog=
 region causing unwanted consumption or mis-operation.=20

Yes, I should have said. =20




There is another fun device that I built some time back.

Wire a 6V relay so that the normally closed contacts are in series with the=
 relay. Now add a shielded cable of about a meter, and connect the shield t=
o the battery side of the contacts, and the center conductor to the coil si=
de through a good capacitor that can take some current, 0.1uF or thereabout=
s, and on the other end, fabricate a small coil of 10-30 turns.   Add a pus=
hbutton in series with the battery, and you have "Angry Bees".

The pulses of current through the coil have significant energy, and you can=
 then probe around your system to see what's "sensitive".






--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.