Example for 4x4 keypad (0~9 + A, B, C, D) · Issue #27 · Chris--A/Keypad · GitHub
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![Membrane Button Keypad [Types] - ElectroDragon](https://s5.electrodragon.com/wp-content/uploads/2012/01/keypad_diagram.jpg "Membrane Button Keypad [Types] - ElectroDragon")
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