K:03 is an ergonomic, split, mechanical keyboard with five thumb keys on each half and the ability to install encoders on either half

K:03 keeps a 60% footprint, a 60-key layout, and clean ergonomics across two versions: the Wired Edition and the Wireless Edition

Design philosophy

K:03 combines futuristic styling, a compact form factor, and practical ergonomics. The Wired Edition is built for a feature-rich daily setup, and the Wireless Edition adds Bluetooth portability

Features

• Split, ergonomic design
• 60 fully programmable keys and 15 additional layers for all your tasks
• Optional encoder support on either half
• Hot-swappable PCB (MX sockets)

Wired Edition

• Powered by RP2040 and QMK firmware
• USB-C connection between halves
• Easily remap any key and customize your keyboard with Vial
• OLED display and active-layer indicator

Wireless Edition

• Powered by nRF52840 and RMK/ZMK firmware
• Bluetooth connectivity for up to 6 devices
• Rechargeable 200 mAh battery
• USB-C connection

This repository contains all files related to this keyboard

PCB and schematic for K:03 v4 and K:03 v4 – Wireless Edition

BOM

K:03 v4

Components	Quantity (pcs)
K:03 v4 PCB	1
RP2040 MCU, LQFN-56	2
OLED SSD1306 Display, 128x32, DSP-OLED-128X32	2
MX hotswap sockets	60
1N4148W diodes, SOD-523F	60
Resistor 0402 5.1 kΩ	8
Resistor 0402 1 kΩ	2
Resistor 0402 200 Ω	2
Resistor 0402 27 Ω	4
Capacitor 0402 1 nF	4
Capacitor 0402 15 pF	4
Capacitor 0402 100 nF	10
Capacitor 0402 2.2 µF	2
SMD LED SK6803MINI-E-001	2
P-channel MOSFET, SOT-23, JSM2301S	2
SMD tactile switch TS-1187F-1526	4
LDO, SOT-23-3, 662K	2
SPI flash W25Q32JVSSIQ	2
SMD USB connector USB-TYPE-C-021	2
SMD USB connector USB-TYPE-C-018	2
SMD crystal resonator 12 MHz XXHCCLNANF-12.000000MHZ	2
3M bumpons (8 mm)	8
MagSafe ring (optional)	2

K:03 v4 – Wireless Edition

Components	Quantity (pcs)
K:03 Wireless Edition PCB	1
E73-2G4M08S1C Bluetooth module	2
MX hotswap sockets	60
1N4148W diodes, SOD-523F	60
B5819WS Schottky diode, SOD-323	2
Resistor 0402 5.1 kΩ	6
Resistor 0402 100 kΩ	2
Resistor 0402 806 kΩ	2
Resistor 0402 2 MΩ	2
Resistor 0402 10 kΩ	2
Capacitor 0402 4.7 µF	4
SMD LED SK6803MINI-E-001	2
P-channel MOSFET, SOT-23, JSM2301S	4
MSK12CO2-SZ SMD slide switch	2
LN2054Y42AMR linear Li-Ion battery charger, SOT-23-5	2
ZX-SH1.0-2PWT SMD wire-to-board connector	2
AP2112K-3.3TRG1 LDO regulator, SOT-23-5	2
SMD USB connector USB-TYPE-C-018	2
TS5235A 250gf 025 SMD tactile switch	2
Li-Pol, 3.7V, 200mAh, 402030 with JST SH-1.0mm, 2 pin connector	2
3M bumpons (8 mm)	8
MagSafe ring (optional)	2
Plexiglass window for case, 24x23 mm (optional)	2

License

The files in this repository are licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License

Useful links

• K:03 v4:

  • Case for 3D printing (STL)
  • Case model for editing (STEP)
  • Circuit schematic

• K:03 v4 – Wireless Edition:

  • Case for 3D printing (STL)
  • Case model for editing (STEP)
  • Circuit schematic

Firmware

• Pre-compiled files
• Source code:
  • wired QMK
  • wireless RMK

Availability

The complete keyboard (not a DIY kit) is available for purchase at eh.industries