Driving LED's with PWM

[Demon]

I don't know your exact setup, but I'd put a transistor after the PIC and use a pull-down resistor. If the PIC fries, transistor goes off. If PIC fails ON, not much you can do besides safety features you mentionned.

Robert

[Christopher4187]

The ULN2003 is a transistor (darlington pair).

Years ago I learned (the hard way) that having a hardware backup to protect the device (i.e. After all of the controlling hardware/software) is worth a mountain of gold. Fuses are under-appreciated and have a thankless job.