I'm on my first arduino project, I'm trying to set up a 4x4 grid of LED buttons for a puzzle. The LEDs I can control using the tutorial found here: https://www.arduino.cc/en/Tutorial/ShiftOut I used two 74HC595 as suggested in the tutorial, and it worked great. For the shift out, however, the tuto…

CD4021BE for Buttons instead of Switches

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