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Breadboard 4x4 LED matrix - YouTube
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Matrix 4x4 Shield - Hackster.io
How Does Led Matrix Work?
How should I current limit a LED matrix? - Electrical Engineering Stack Exchange
Drop of Will - Blink project: Hacking on an Arduino
Button Pad Hookup Guide - learn.sparkfun.com
4×4 Button Pad | Interacting Objects
Controlling 4x4 LED matrix with Huzzah Feather and 20-pin shift register - Electrical Engineering Stack Exchange
