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Shift Registers: How Do They Work?
That was a great write up and a very cool explanation. I liked the stop motion paper animation. I know you are trying to keep it minimal so that it is digestible but it might be worth discussing pin 9 & 13 more. Or indicating what someone can learn next. Pin 9's overflow bit allows you to chain multiple registers together. And looking at pin 13, why would you want to disable output? What was the the high-impedance state you mentioned in the intro? Pulling it high when not in use so that noise doesn't accidentally clock the data or output. (obviously you know this, i'm being rhetorical) But even cooler is that once you view the Output Enable pin as Chip Select suddenly your interface to the register looks a lot like SPI which can really change your view of what a shift register can do.
Super cool little jig. It would be cool to add a tick mark that indicated on the edge of the board where the center of the hole will be. Since you probably use just a few common thicknesses of wood, you could just add the common ticks.
Small Portable Speaker Covered With Wool