HardLabs

Mad hatter

raphaelfaria·mad-hatter

Mad hatter PCB layout, top view — open source AVR/Arduino board by raphaelfaria
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About the Mad hatter PCB

Mad hatter is an open source AVR/Arduino PCB design by raphaelfaria, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 337.2 × 122.6 mm, with 154 components from 13 distinct parts.

Its main chip is the ATMEGA32U4, from the AVR/Arduino family. By type, the board carries 8 capacitors, 4 resistors, 1 IC, 1 crystal, 1 connector and 1 fuse.

It belongs with the keyboards designs in this gallery.

From the project

Project overview Frequently Asked Questions (FAQ) Board preview Changelog Bill of Materials Acknowledgements * License

Project overview Frequently Asked Questions (FAQ) Board preview Changelog Bill of Materials Acknowledgements * License

The Mad Hatter is a freely available, open-source ergo keyboard Printed Circuit Board (PCB), designed to be compatible with TGR Alice plates and cases. All resources and software used to design this board are open-source and/or freely available.

Main components on the Mad hatter

ATMEGA32U4

Mad hatter bill of materials (BOM)

154 components, 13 distinct parts.

QtyPartRefs
1
ATMEGA32U4
U1
1
16MHz
X1
1
USB_B_Mini
J1
66
D
D_0, D_1, D_2, D_3, D_4, D_5, D_6, D_7 +58
1
1A
F1
71
KEYSW
K_0, K_1, K_2, K_3, K_4, K_5, K_6, K_7 +63
1
SW_PUSH
RSW1
2
22p
C1, C2
4
0.1u
C3, C4, C5, C6
1
4.7u
C7
1
1u
C8
2
10k
R1, R4
2
22
R2, R3

Mad hatter design files

The KiCad project lives in the raphaelfaria/mad-hatter repository on GitHub; these links point at the commit this page was built from.

Mad hatter: common questions

What microcontroller does the Mad hatter use?

The Mad hatter is built around the ATMEGA32U4, from the AVR/Arduino family.

How big is the Mad hatter PCB?

The Mad hatter measures 337.2 × 122.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mad hatter?

154 components, from 13 distinct parts. The full bill of materials is listed on this page.

Where can I download the Mad hatter design files?

From the raphaelfaria/mad-hatter repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Mad hatter design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Mad hatter 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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