HardLabs

Sagittarius

AcheronProject·Sagittarius·kicad_files/sagittarius.kicad_pcb

Sagittarius PCB layout, top view — open source STM32 board by AcheronProject

About the Sagittarius PCB

Sagittarius is an open source STM32 PCB design by AcheronProject, published on GitHub. It is a 2-layer board measuring 372.4 × 128.1 mm, with 382 components from 109 distinct parts.

Its main chip is the STM32F072-LQFP48, from the STM32 family. Other key parts include the MCP1700-3302E_SOT23 and TXS0101DBVR. By type, the board carries 85 diodes, 84 LEDs, 83 switches, 21 capacitors, 19 resistors and 3 ICs.

It belongs with the keyboards designs in this gallery.

From the project

An ergonomic layout keyboard made to minimize wrist, back and shoulder strain

See this page for the SagittariusPCB documentation.

The Sagittarius is an optimized-ergonomic layout PCB that employs research-level results to deliver a layout that minimizes strain in wrists and hand joints.

The procedure used to deliver this layout is described in the About section.

Renders generated by the tracespace.io site.

It’s not news to anyone that the current staggered layout we have is not ideal for the anatomy of the hands. According to specialists (see [1]), when long work and study hours are concerned, the current default layout causes lesions including, but not limited to :

Sagittarius, from the project README
From the project README

Main components on the Sagittarius

STM32F072-LQFP48MCP1700-3302E_SOT23TXS0101DBVR

Sagittarius bill of materials (BOM)

382 components, 109 distinct parts.

QtyPartRefs
1
STM32F072-LQFP48
STMicroelectronics
U1
1
MCP1700-3302E_SOT23
Microchip
U2
1
TXS0101DBVR
TXS0101
Texas Instruments
U3
1
AO3401A
Microdiode Electronics
Q1
1
DTC123JKAT146
ROHM Semicon
Q2
1
Conn_ARM_JTAG_SWD_10
J1
1
SM04B-SRSS
JST Sales America
J2
1
100n
CB1
77
420
RL1, RL2, RL3, RL4, RL5, RL6, RL7, RL8 +69
4
EC11Ex
ROT1, ROT2, ROT3, ROT4
1
PCM12SMTR
C&K
S1
1
SKQGADE010
ALPS Electric
S2
1
PGUP
SW1
1
ESC
SW2
1
1
SW3
1
2
SW4
1
3
SW5
1
4
SW6
1
5
SW7
1
6
SW8
Show 89 more
QtyPartRefs
1
7
SW9
1
8
SW10
1
9
SW11
1
10
SW12
1
MINUS
SW13
1
PLUS
SW14
1
LEFT_BACKSPACE
SW15
1
RIGHT BACKSPACE
SW16
1
2U BACKSPACE
SW17
1
PGDN
SW18
1
TAB
SW19
1
Q
SW20
1
W
SW21
1
E
SW22
1
R
SW23
1
T
SW24
1
Y
SW25
1
U
SW26
1
I
SW27
1
O
SW28
1
P
SW29
1
LBRACE
SW30
1
RBRACE
SW31
1
BKSLSH
SW32
1
HOME
SW33
1
CAPS LOCK
SW34
1
A
SW35
1
S
SW36
1
D
SW37
1
F
SW38
1
G
SW39
1
H
SW40
1
J
SW41
1
K
SW42
1
L
SW43
1
COLON
SW44
1
QUOTE
SW45
1
ISO_TILDE
SW46
1
ANSI_ENTER
SW47
1
ISO_ENTER
SW48
1
STEPPED CAPS
SW49
1
END
SW50
1
225_LSHIFT
SW51
1
ISO_BLACKSLASH
SW52
1
Z
SW53
1
X
SW54
1
C
SW55
1
V
SW56
1
B
SW57
1
N
SW58
1
M
SW59
1
COMMA
SW60
1
DOT
SW61
1
SLASH
SW62
1
225_RSHIFT
SW63
1
UP
SW64
1
SPLIT_RSHIFT_FN
SW65
1
125_LSHIFT
SW66
1
125_RSHIFT
SW67
1
LCTRL
SW68
1
LGUI
SW69
1
1U_LSPACE
SW70
1
225_LSPACE
SW71
1
275_RSPACE
SW72
1
100_RSPACE
SW73
1
DOWN
SW74
1
RIGHT
SW75
1
175_LSPACE
SW76
1
150_LSPACE
SW77
1
150_RALT
SW78
1
150_RCTRL
SW79
1
175_RSPACE
SW80
1
LEFT
SW81
84
LED
LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 +76
76
1N4148
D1, D2, D3, D4, D5, D6, D7, D8 +68
1
RB060M-60TR
ROHM
D73
8
WS2812-2020
Worldsemi
D78, D79, D80, D81, D82, D83, D84, D85
1
150R@100MHz
TAITEC
FB1
1
4.7u
C1
4
100n
C2, C3, C4, C7
1
10u
C5
1
10n
C6
2
1u
C8, C9
2
10n
C10, C11
10
100n
C12, C13, C14, C15, C16, C17, C18, C19 +2
7
10k
R1, R5, R6, R7, R8, R17, R18
2
100k
R2, R3
2
100R
R4, R19
8
3R
R9, R10, R11, R12, R13, R14, R15, R16

Sagittarius design files

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

Sagittarius: common questions

What microcontroller does the Sagittarius use?

The Sagittarius is built around the STM32F072-LQFP48, from the STM32 family.

How big is the Sagittarius PCB?

The Sagittarius measures 372.4 × 128.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Sagittarius?

382 components, from 109 distinct parts. The full bill of materials is listed on this page.

Where can I download the Sagittarius design files?

From the AcheronProject/Sagittarius repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Sagittarius design in my own project?

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

Can I test firmware for the Sagittarius 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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