How to make a keyboard - the matrix

Tutorial parts: 1 matrix | 2 controller (coming soon) | ...

Update (May 2016): check out the Russian translation: Как сделать клавиатуру — Матрица!

This will be the first and hopefully not the last post in the keyboard series. I'm hoping to make this a keyboard building tutorial from the ground up. Today I'll cover digital I/O and keyboard matrices. Equip yourself with some basic knowledge of electronics from school and let's get started.

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