Many (most? all?) cash register receipts are printed onto thermal=20
paper.  You could cut out little pieces from the unchanged areas and=20
glue them to resistors.  When you make the resistor get hot, the paper=20
will permanently change color.

Kerry


alan smith wrote:
> So looking for a non powered visual indicator..ie...something that change=
s color, that would be tripped by the micro that a tech would be able to lo=
ok 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?
>
>  =20

--=20
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