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Re: microcontroller picking up noise?
I've been recently working with pic microprocessor and I was picking up alot of noise from the other pins. I solved the problem by grounding them out. Also make sure that your LED isn't getting to much current, about 20mAmps per a LED is normal. You might not see a light if theres to much current.
When using your oscilloscope add an op amp to reduce the impedience of your testing tool. This will make your testing effect your chip less.
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