Hmm, array of SMD resistors, slip of thermal paper over it, and have it spit out a QR code when something trips, customer can take picture of it and send it in, and hopefully you have enough information in the fault code to show up fully prepared to repair/replace/service the equipment -Jon On Mon, Sep 10, 2012 at 4:42 PM, Kerry Wentworth wrote: > Many (most? all?) cash register receipts are printed onto thermal > paper. You could cut out little pieces from the unchanged areas and > glue them to resistors. When you make the resistor get hot, the paper > will permanently change color. > > Kerry > > > alan smith wrote: >> So looking for a non powered visual indicator..ie...something that chang= es color, that would be tripped by the micro that a tech would be able to l= ook at and say...failed board due to....X >> >> So when the board is running this "thing" can be controlled and then its= forever changed in state, even with the power off. >> >> >> Can't have smoke...so making a resistor crispy isnt allowed. >> >> Any thoughts? >> >> > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .