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Re: microcontroller picking up noise?
I have played with a 18F458 and an LED before. But I have only powered it with batteries(4.5v) and it work fine.
Try:
powering the entire system with only battery power
try striping down the code to bare minimum(take out interupts and such)
I can't help you much more because it you seems that you know a lot more about it than I do.
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