keybrd library is an open source library for creating custom-keyboard firmware.

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Tutorial 2 - single-layer keyboard

This annotated sketch explains how the keybrd library works: keybrd_2_single-layer_annotated.ino

You can view the class definitions in the keybrd library.

After reading the sketch you will be to modify it to suite your own single-layer keyboard design.

Exercises

1) Add a third column to the breadboard and sketch.

Layout	0	1	2
0	a	b	c
1	1	2	shift