> I also tried some standard low-intensity red LEDs.... They are
> very boring to say the least. At 10V they blow for about 10
> seconds then die. At 15V they die instantly. In both cases you
> can see a bit of a black spot by the die. No fun

How inconsiderate of them.......

If you have enough I/O you could drive the "fuses" by x/y, similar
to the simplest keypad arrangement

Could you perhaps use thermochromic paint in any way ? You can
get both reversible and irreversible types. I know the irreversible
stuff is used to record if eg refrigerated food has been exposed to
too high a temperature. I think it goes blue or black, don't know
what colour it starts at though

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