Tutorial 2 - single-layer keyboard
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The easiest way to learn the keyboard library is to read some simple sketches.
[keybrd_2_single-layer_annotated.ino](keybrd_2_single-layer_annotated/keybrd_2_single-layer_annotated.ino) is a simple sketch with annotations that explain how a keybrd sketch works.
The sketch will run on the basic breadboard keyboard described in [tutorial_1_breadboard_keyboard.md](tutorial_1_breadboard_keyboard.md)

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

![basic breadboard keyboard](keybrd_1_breadboard/breadboard_keyboard_2x2.JPG "basic breadboard keyboard")

Exercises
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1) Read the three class definitions #included in the sketch.
Classes are defined in the [keybrd library](../src/).

2) Add a third column to the breadboard keyboard and sketch.

| Layout |**0**|**1**|**2**|
|:------:|:---:|:---:|:---:|
|  **0** |  k  |  e  |  y  |
|  **1** |  b  |  r  |  d  |

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