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It was my first engineering job and I was tasked with creating the new reliability system for our chip laser components. I had big dreams, I wanted to be able to test 256 individually addressable laser chips on a single board! Having this many high-current IO lines is difficult, unless you use a matrix! Simple, right? WRONG.   LED matrices allow individual LED's to be addressed individually. They look something like this:     So lets say I want to turn on D4 by setting AN1 hig ...