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Mist

modern-hobbyist·aesir·mist/mist-udb-mk-ii-north/mist.kicad_pcb

Top view of the Mist PCB
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Mist is an open source STM32 PCB design by modern-hobbyist: a 2-layer, 372.1 × 141.2 mm board with 445 components (20 distinct parts). It is built around the XC6206PxxxMR-Regulator_Linear, CR2013-MI2120, STM32G474RETx, SN74AHCT1G125DBVR. Filed under keyboards and displays & leds.

Collection of KiCad PCB designs for custom keyboards, including full-sized and split ergonomic layouts with STM32F072CBT6 microcontrollers.

Mist is my take on a full size keyboard, but with some upgrades I carried over from my second keyboard build--Hermod. Furthermore, this is the UDB version of Mist, which stands for Unified Daughter Board

Aside from the UDB connector and the lack of USB-C/on-board ESD protection circuitry, this keyboard is functionally identical to the base Mist keyboard.

This project is open source, so I'll do my best to keep it updated as questions come in. I can't guarantee I'll always have time to respond, but if you have questions you can reach out on my Discord server or on the Keyboard Atelier Discord.

Mist, from the project README
From the project README

Built around

XC6206PxxxMR-Regulator_LinearCR2013-MI2120STM32G474RETxSN74AHCT1G125DBVR

Parts list

445 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
XC6206PxxxMR-Regulator_Linear
U3
1
CR2013-MI2120
U4
1
STM32G474RETx
U5
1
SN74AHCT1G125DBVR
U6
1
MMUN2133LT1G
Q3
1
78171-0004
MOLEX
J1
1
Conn_01x05
J2
103
KS33_SW_HS
CH1, CH2, CH3, CH4, CH5, CH6, CH7, CH8 +95
1
DFU
RESET1
6
MX_stab
S1, S2, S3, S4, S6, S7
1
MX_stab
S5
103
choc_SK6812MINI-E
LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 +95
103
D
D1, D2, D3, D4, D5, D6, D7, D8 +95
2
1N4148
D110, D111
104
0.1uF
C1, C2, C3, C4, C5, C6, C7, C8 +96
7
100nF
C104, C105, C106, C107, C108, C109, C110
3
100n
C120, C121, C130
2
1uF
C127, C128
1
120
R7
2
68k
R8, R9

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