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Phase

mjpauly·phase·phase/phase.kicad_pcb

Phase PCB layout, top view — open source AVR/Arduino board by mjpauly
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About the Phase PCB

Phase is an open source AVR/Arduino PCB design by mjpauly, published on GitHub. It is a 2-layer board measuring 128 × 92.6 mm, with 66 components from 17 distinct parts.

Its main chip is the ATmega32U4-AU, from the AVR/Arduino family. Other key parts include the PCA9555PW. By type, the board carries 21 relays, 21 diodes, 9 capacitors, 8 resistors, 2 ICs and 2 connectors.

It belongs with the keyboards designs in this gallery.

From the project

42-key split keyboard inspired by Corne, Kyria, and Ferris

- Kyria stagger, Corne thumb cluster, Ferris-inspired electronics. - USB-C - Reversible PCB for use with both hands. - MX-style key switch support with optional Kailh hot swap sockets. - 42 keys.

A one-off moon-themed sand-cast aluminum case was also designed in Spring 2022. See here for photos of the manufacturing process!

- Assembled and tested - Fixes SDA/SCL swap - Removes silkscreen art (just too cluttered) - Gerbers are at phase/JLCPCB2022-01-29v101.zip.

Phase, from the project README
From the project README

Main components on the Phase

ATmega32U4-AUPCA9555PW

Phase bill of materials (BOM)

66 components, 17 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATmega32U4-AU
U1
1
PCA9555PW
U2
1
Crystal_GND24_Small
X1
1
USB_C_Receptacle_USB2.0
J1
1
AudioJack4
J2
1
500mA
F1
21
KEYSW
K1, K2, K3, K4, K5, K6, K7, K8 +13
1
SW_Push
SW1
21
D
D1, D2, D3, D4, D5, D6, D7, D8 +13
2
22p
C1, C2
5
0.1u
C3, C4, C5, C6, C9
1
4.7u
C7
1
1u
C8
2
5.1k
R1, R2
2
22
R3, R4
2
10k
R5, R6
2
4.7k
R7, R8

Phase design files

The KiCad project lives in the mjpauly/phase repository on GitHub; these links point at the commit this page was built from.

Phase: common questions

What microcontroller does the Phase use?

The Phase is built around the ATmega32U4-AU, from the AVR/Arduino family.

How big is the Phase PCB?

The Phase measures 128 × 92.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Phase?

66 components, from 17 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Phase design files?

From the mjpauly/phase repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Phase design in my own project?

The repository has no license, so all rights stay with mjpauly. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Phase 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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