HardLabs

Unicorn

yanghu·unicorne·unicorn-mx/unicorn/unicorn.kicad_pcb

Unicorn PCB layout, top view — open source STM32 board by yanghu

About the Unicorn PCB

Unicorn is an open source STM32 PCB design by yanghu, published on GitHub under the MIT license. It is a 2-layer board measuring 268.2 × 110.5 mm, with 142 components from 35 distinct parts.

Its main chip is the STM32F411CCUx, from the STM32 family. Other key parts include the XC6206PxxxMR and SRV05-4. By type, the board carries 55 diodes, 44 relays, 16 capacitors, 9 resistors, 6 connectors and 3 ICs.

It belongs with the keyboards and displays & leds designs in this gallery.

From the project

A one-piece 40% ortho keyboard design inspired by crkbd, Kyria and Ferris.

This is the keyboard design files for my own use, inspired by crkbd, Kyria and Ferris, as well as Reviung41 and others.

The name means "uni(single-piece)corne".

USB-C connector Audio buzzer Rotary encoder x 2 (optional) Underglow RGB LEDs x8 SMT32 MCU (STM32F411) OLED display Column stagger similar to Kyria. Corne-style thumb cluster with extra inner key: I feel Kyria's thumb cluster is too much and the outer column is hard to reach for me. * Thumb cluster shifted 0.25u to the middle.

Unicorn, from the project README
From the project README

Main components on the Unicorn

XC6206PxxxMRSTM32F411CCUxSRV05-4

Unicorn bill of materials (BOM)

142 components, 35 distinct parts.

QtyPartRefs
1
XC6206PxxxMR
U1
1
STM32F411CCUx
U2
1
SRV05-4
U4
1
MMBT3904
Q1
1
25MHz
Y1
1
32.768KHz
Y2
2
Conn_01x06
J1, J3
1
USB_C
J2
3
Conn_01x04
J4, J5, J6
1
Buzzer
BZ1
1
JK-MSMD050
F1
42
KEYSW
K1, K2, K3, K4, K5, K6, K7, K8 +34
2
KEYSW
K40, K41
1
SW_Push
SW1
2
Rotary_Encoder_Switch
SW2, SW3
1
OLED
OL1
44
D
D1, D2, D3, D4, D5, D6, D7, D8 +36
1
1N4148
D45
1
SS14
D46
1
SMF9.0CA
D47
Show 15 more
QtyPartRefs
8
WS2812S
D48, D49, D50, D51, D52, D53, D54, D55
2
10uF
C1, C13
6
0.1uF
C2, C5, C6, C10, C14, C15
3
1uF
C3, C4, C12
2
20pF
C7, C8
2
1.5pF
C9, C16
1
4.7uF
C11
1
1M
R1
1
330k
R2
1
100
R3
1
2.2k
R4
1
47k
R5
1
10k
R6
2
5.1k
R7, R8
1
0
R9

Unicorn design files

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

Unicorn: common questions

What microcontroller does the Unicorn use?

The Unicorn is built around the STM32F411CCUx, from the STM32 family.

How big is the Unicorn PCB?

The Unicorn measures 268.2 × 110.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Unicorn?

142 components, from 35 distinct parts. The full bill of materials is listed on this page.

Where can I download the Unicorn design files?

From the yanghu/unicorne repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Unicorn design in my own project?

Yes, under the terms of its MIT license, which yanghu chose for the repository.

Can I test firmware for the Unicorn without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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