At 11:39 AM 9/10/2012, alan smith wrote: >So looking for a non powered visual indicator..ie...something that=20 >changes color, that would be tripped by the micro that a tech would=20 >be able to look at and say...failed board due to....X > >So when the board is running this "thing" can be controlled and then=20 >its forever changed in state, even with the power off. > >Can't have smoke...so making a resistor crispy isnt allowed. I think that you may actually have suggested one possible solution:=20 use a small SMD resistor that has been painted with=20 temperature-sensitive paint. I've read about temperature-indicating=20 paints or pastes that permanently change color when their trip=20 temperature has been reached. I'm guessing that you could easily achieve 100C (or more) with a=20 suitable SMD resistor (1/10W or 1/16W). dwayne --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .