4 layers99 × 53.3 mm
PSLab
fossasia/pslab-hardware
PSLab Hardware Design and Schematics https://pslab.io
199 parts1.7kApache-2.0
2 layers123 × 98.1 mm
Min34
donus3/min3411minimal split keyboard with 34 keys
- Size
- 123 × 98.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 44
- Nets
- 36
- Pads
- 438
- Tracks, vias
- 647, 63
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 14 Oct 2022
- Updated
- 3 Dec 2022
Overview
Min34 is an open-source printed circuit board by donus3, from the donus3/min34 repository on GitHub, published under the MIT licence. It is a 2-layer board of 123 × 98.1 mm with 44 parts on 36 nets, routed with 647 tracks and 63 vias.
It is built around the 1N4148W. Its parts include 17 diodes, 17 switches, 1 IC and 1 connector. It belongs with the keyboards and input boards and the nRF52 and nRF5x and SAM D and SAM boards of this library.
Main components
1README
README.mdmin34
A minimal split keyboard with 34 keys
Features
- 34 keys (inspired by Sweep)
- Support a hotswap switch both MX and Kailh low profile style (inspired by SofleKeyboard)
- Using seeed studio XIAO series microcontroller which means both wire and wireless are available
- Support a battery switch on/off if Bluetooth microcontroller is used
- The PCB is reversible
- No reset button (it's already on the microcontroller)
I don't focus on adding more features like an OLED display or a rotary encoder because I would like to keep it as simple as possible and I personally don't use them in my daily life (as a programmer).
Compnents
- 2x PCBs (for left and right)
- 2x seeed studio XIAO compatible boards.
- 34 switches of MX or Kailh low profile style
- 34 kailh switch sockets (MX or Kailh low profile)
- 34 diodes 1N4148W
- 34 keycaps
- (optional; only for battery support) 2x power switches (MSK 12C02)
- (optional; only for wire support) 2x TRRS connectors
- (optional; only for wire support) 1x TRRS cable
- 1 USB Cable
Firmware
Please refer to min34 zmk config
Thanks to
- SofleKeyboard
- crkbd
- Slice36
- Sweep
- Seeed xiao nrf52840 mcu: https://www.seeedstudio.com/Seeed-XIAO-BLE-nRF52840-p-5201.html
- Seeed Fusion PCBA service: https://www.seeedstudio.com/pcb-assembly.html
- Seeed Fusion DIY Mechanical Keyboard contest: https://www.seeedstudio.com/seeed-fusion-diy-xiao-mechanical-keyboard-contest.html
Gallery
Parts
44| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | 1N4148W | SofleKeyboard-footprint:Diode_SOD123 | D1, D2, D3, D4, D5, D6, D7, D8, D10, D11, D12, D13, D14, D15, D16, D17 +1 |
| 17 | SW_Push | SofleKeyboard-footprint:CherryMX_KailhLowProfile_Hotswap | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17 +1 |
| 4 | MountingHole | SofleKeyboard-footprint:HOLE_M2_TH | H1, H2, H3, H5 |
| 2 | MountingHole_Pad | kbd:1pin_conn | B+, GND |
| 2 | SW_DPDT_x2 | Kicad-Footprints-main:SPDT_C128955 | SW_POWER_B1, SW_POWER_F1 |
| 1 | MJ-4PP-9 | SofleKeyboard-footprint:MJ-4PP-9 | J1 |
| 1 | Seeed XIAO BLE nRF52840 | xiao:xiao-ble-tht | U1 |
Questions
How big is the Min34 PCB?
It measures 123 × 98.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Min34 use?
44 parts, built around the 1N4148W. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Min34 KiCad files?
From the donus3/min34 repository on GitHub, at the commit this page was made from: the board is pcb/min34.kicad_pcb and its schematic pcb/min34.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Min34 design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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