HardLabs

Keyboard3x3

Code-Tomato·Keyboard2x2

Keyboard3x3 PCB layout, top view — open source AVR/Arduino board by Code-Tomato

About the Keyboard3x3 PCB

Keyboard3x3 is an open source AVR/Arduino PCB design by Code-Tomato, published on GitHub under the MIT license. It is a 2-layer board measuring 69.9 × 38.1 mm, with 25 components from 14 distinct parts.

Its main chip is the ATmega32U4-A, from the AVR/Arduino family. By type, the board carries 7 capacitors, 4 diodes, 4 resistors, 1 IC, 1 crystal and 1 connector.

It belongs with the keyboards designs in this gallery.

From the project

A 2x2 keyboard that introduced me into PCB design through KiCAD.

In the future, I will be developing the drivers through QMK.

Make sure you get your preferred key switches and keycaps for this build.

Keyboard3x3, from the project README
From the project README

Main components on the Keyboard3x3

ATmega32U4-A

Keyboard3x3 bill of materials (BOM)

25 components, 14 distinct parts.

QtyPartRefs
1
ATmega32U4-A
U1
1
16MHz
Y1
1
Conn_01x04_Pin
J5
1
500mA
F1
4
MX-NoLED
MX1, MX2, MX3, MX4
1
SW_Push
SW1
1
Molex-0548190589
USB1
4
D_Small
D1, D2, D3, D4
3
.1uF
C1, C2, C3
2
22pF
C4, C5
1
10uF
C6
1
1uF
C7
2
22
R1, R2
2
10k
R3, R4

Keyboard3x3 design files

The KiCad project lives in the Code-Tomato/Keyboard2x2 repository on GitHub; these links point at the commit this page was built from.

Keyboard3x3: common questions

What microcontroller does the Keyboard3x3 use?

The Keyboard3x3 is built around the ATmega32U4-A, from the AVR/Arduino family.

How big is the Keyboard3x3 PCB?

The Keyboard3x3 measures 69.9 × 38.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Keyboard3x3?

25 components, from 14 distinct parts. The full bill of materials is listed on this page.

Where can I download the Keyboard3x3 design files?

From the Code-Tomato/Keyboard2x2 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Keyboard3x3 design in my own project?

Yes, under the terms of its MIT license, which Code-Tomato chose for the repository.

Can I test firmware for the Keyboard3x3 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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