Hi all! Long time lurker, first time poster. I am working on a project where I want to use a PIC pin to detect that an incandescent light bulb (120VAC 25W) has been inserted into a standard light socket-- >From one lurker to another! Could you install a low voltage transformer (120:25) in series with the lamp and wire the appropriate resistor across the switch. It shouldn't be to hard to clip the voltage from the transformer to a useable level with the detection voltage running through it and still handle the 120 line. Tom -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist