4 layers91.5 × 32.7 mm
Pcb challenge final
davidlesman/PCB-Challenge-2026
PCB Challenge sponsored by PCBWay and Jane Street
154 parts
2 layers409.5 × 137 mm
Keyboard
GlassyBridge/Keyboard2Keyboard
- Size
- 409.5 × 137 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 373
- Nets
- 314
- Pads
- 1,840
- Tracks, vias
- 3,543, 542
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 19 Oct 2025
- Updated
- 1 Apr 2026
Overview
Keyboard is an open-source printed circuit board by GlassyBridge, from the GlassyBridge/Keyboard repository on GitHub, published under the MIT licence. It is a 2-layer board of 409.5 × 137 mm with 373 parts on 314 nets, routed with 3,543 tracks and 542 vias.
It is built around the MDBT50Q-1MV2, MT3608 and 74LV1T08GVH, with the USB6B1, SK6803MINI-E and ESDA5V3L among its other parts. Its parts include 198 diodes, 99 switches, 22 resistors, 8 capacitors and 8 ICs. It belongs with the keyboards and input boards and the nRF52 and nRF5x boards of this library.
Main components
6
MDBT50Q-1MV2
SMD-61PSMD-61P Bluetooth Modules ROHSRAYTACBluetooth Modules
MT3608
SOT-23-6-40℃~+85℃ 1 1.2MHz 100uA、1.6mA 2A 2V~24V Adjustable Boost Boost Built-in No SOT-23-6 DC-DC Converters ROHS西安航天民芯DC-DC Converters
74LV1T08GVH
SOT-753-40℃~+125℃ 1 1.45V、2.15V、2.8V、4.5V 1.6V~5.5V 1uA 2 200mV、250mV、252mV、350mV 4.6ns@5V,30pF 580mV~800mV 74LV Series 8mA 8mA 940mV~2.1V AND Gate Overvoltage-tolerant input SOT-753 Logic Gates ROHSNexperiaLogic Gates
USB6B1
SO-8-40℃~+85℃ 10uA 15pF、25pF 2 25A@8/20us 5.25V 500W@8/20us 6V IEC 61000-4-2 TVS SO-8 ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)SK6803MINI-E
32283228 New Arrivals ROHSNORMANDUncategorised
ESDA5V3L
SOT-23-40℃~+125℃@(Tj) 15A@2.5us 2 220pF 2uA 300W 3V 5.3V 5.3V ESD IEC 61000-4-2 Unidirectional SOT-23 ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)
README
README.mdMK-1000
A Modular-Wireless Keyboard
A fully custom modular keyboard that has both wireless and wired capabilities, uses MX hotswap switches (with per key RGB lighting) and magnetic pogo pin connectors with I2C protocol.
Features
- Works over USB-C (wired) or Bluetooth (wireless)
- Integrated magnetic pogo pins for stable I2C connection and adding external modules (numberpads, macropads or OLED modules)
- Integrated charging circuit for portability and wireless operation
- Uses MX hotswap sockets for key switch connections
- Features SK6812MINI-E back mounted LEDs for customizable per key RGB lighting
- Includes a dedicated SWD interface for debugging and development
- A dedicated slide switch to manage battery life
Why this project?
This project was made as an attempt to tackle more complex hardware from my previous projects. I spent a lot of time designing and reiterating it and its purpose is simple. I made it to function as a plug and play device that has modular capabilities.
I also wanted a cool looking keyboard so I added features I liked into this one big project.
Design
Schematic
Main board & Keypad
PCB
PCB back
PCB front
PCB
PCB 3D model
PCB 3D model with components
Wiring Diagram
Firmware
Available in the Firmware folder. (Basic version for now. I'll update it once I built the keyboard)
Bill of Materials
| Name | Reference | Qty | moq | Price ($) | Shipping | Link |
|---|---|---|---|---|---|---|
| OLED Screens (128X32) | Brd11 | 1 | 1 | 2.42 | Aliexpress | Aliexpress |
| ------------ (128X64) | Brd12 | 1 | 1 | 4.18 | Aliexpress | Aliexpress |
| 1X6 Magnetic Pogo Pins | Conn1-Conn8 | 8(4 pairs) | 5p | 25.25 | Aliexpress | Aliexpress |
| Capacitors (10uF) | C1-C4 | 4 | 20 | 0.43 | LCSC | C15850 |
| ---------- (4.7uF) | C5,C6 | 2 | 20 | 0.29 | LCSC | C1779 |
| ---------- (22uF) | C7,C8 | 2 | 20 | 1.12 | LCSC | C12891 |
| Diodes | D1-D99 | 99 | 100 | 0.93 | LCSC | C2099 |
| ---------- (SS34) | SS34 | 1 | 20 | 0.56 | LCSC | C908680 |
| ESDA5V3L | ESD1,ESD2 | 2 | 10 | 0.39 | LCSC | C587142 |
| USB Connector | J1 | 1 | 5 | 0.84 | LCSC | C165948 |
| 2x3 1mm PinHeader | J2 | 1 | 20 | 0.65 | LCSC | C6837603 |
| Inductors (10uH) | L1 | 1 | 10 | 0.47 | LCSC | C88173 |
| ---------- (22uH) | L2 | 1 | 5 | 0.83 | LCSC | C27442 |
| SK6812MINI-E (LEDs) | LED1-LED99 | 99 | 100 | 7.45 | LCSC | C5149201 |
| P_Mosfets | Q1-Q3 | 3 | 10 | 0.65 | LCSC | C10487 |
| Resistors (110K) | R1 | 2 | 100 | 0.19 | LCSC | C2907221 |
| ---------- (5K1) | R2,R4 | 2 | 100 | 0.24 | LCSC | C27834 |
| ---------- (100K) | R3,R5,R6 | 2 | 100 | 0.22 | LCSC | C2933502 |
| ---------- (4K7) | R7,R12,R18 | 4 | 100 | 0.19 | LCSC | C17673 |
| ---------- (27R) | R8,R11 | 2 | 100 | 0.22 | LCSC | C17594 |
| ---------- (806K) | R9,R16,R21 | 3 | 100 | 0.22 | LCSC | C2933502 |
| ---------- (2M) | R10,R17,R22 | 3 | 100 | 0.30 | LCSC | C26112 |
| ---------- (15K) | R13 | 1 | 100 | 0.21 | LCSC | C2930170 |
| ---------- (10K) | R14,R19 | 2 | 100 | 0.25 | LCSC | C17414 |
| ---------- (2K) | R15 | 1 | 100 | 0.25 | LCSC | C17604 |
| Rotary Encoder | RE1 | 1 | 1 | 1.87 | LCSC | C470742 |
| Slide switch (1825232-1) | SPDT1 | 1 | 1 | 0.93 | LCSC | C5167252 |
| MT3608 | U1 | 1 | 10 | 0.79 | LCSC | C84817 |
| USB6B1 | U2 | 1 | 1 | 0.47 | LCSC | C283483 |
| MDBT50Q-1MV2 (MCU) | U3 | 1 | 1 | 10.10 | SEED | Seed Studio |
| MCP73831T-2ACI/OT | U4 | 1 | 1 | 0.74 | LCSC | C424093 |
| XIAO-nRF52840-SMD (MCU) | U5 | 1 | 1 | 9.90 | 3.75 | Seed Studio |
| MCP23017 | U6 | 1 | 1 | 2.03 | LCSC | C639770 |
| 74LV1T08GV | U7,U8 | 2 | 1 | 2.12 | LCSC | C547934 |
| Keys ----- (Sockets) | SW1-SW99 | 99 | 110 | 8.18 | Aliexpress | Aliexpress |
| ---------- (Switches) | - | 99 | 105 | 21.85 (T) | Aliexpress | Aliexpress |
| ---------- (Key Caps) | - | 99 | - | 7.48 (T) | Aliexpress | Aliexpress |
| ---------- (Stabilizers) | - | 5 | - | 5.78 (T) | Aliexpress | Aliexpress |
| lithium batteries | - | 2 | - | 18.16 (T) | Aliexpress | Aliexpress |
*T for total price
| Supplier | cost | Shipping | Total cost |
|---|---|---|---|
| LCSC | 24.65 | 13.08 | 37.73 |
| Aliexpress | 93.30 | 2.69 | 96.44 |
| SEED | 20 | 8.55 | 28.55 |
| JLCPCB | 29.90 | 20.14 | 50.04 |
| Total | - | - | 212.76 |
Keyboard Case
A very basic case is provided in the CAD folder.
Parts
373| Qty | Value | Footprint | References |
|---|---|---|---|
| 99 | D | Diode_SMD:D_SOD-123 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +83 |
| 99 | SK6803MINI-E | Footprints:LED | LED1, LED2, LED10, LED11, LED12, LED13, LED14, LED15, LED16, LED17, LED18, LED19, LED20, LED21, LED22, LED23 +83 |
| 88 | SW_Push | Footprints:MX_HS_1u | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +72 |
| 12 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4, H5, H6, H7, H8, H12, H13, H14, H15 |
| 4 | 10uF | Capacitor_SMD:C_0805_2012Metric | C1, C2, C3, C4 |
| 4 | 4K7 | Resistor_SMD:R_0805_2012Metric | R7, R12, R18, R20 |
| 4 | Conn_01x04_Pin | Footprints:Pogopin_Conn_1x4_Female | Conn1, Conn3, Conn5, Conn7 |
| 4 | Conn_01x04_Pin | Footprints:Pogopin_Conn_1x4_Male | Conn2, Conn4, Conn6, Conn8 |
| 3 | 100K | Resistor_SMD:R_0805_2012Metric | R3, R5, R6 |
| 3 | 2M | Resistor_SMD:R_0805_2012Metric | R10, R17, R22 |
| 3 | 806K | Resistor_SMD:R_0805_2012Metric | R9, R16, R21 |
| 3 | Q_PMOS_GSD | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3 |
| 2 | 10K | Resistor_SMD:R_0805_2012Metric | R14, R19 |
| 2 | 22uF | Capacitor_SMD:C_1206_3216Metric | C7, C8 |
| 2 | 27R | Resistor_SMD:R_0805_2012Metric | R8, R11 |
| 2 | 4.7uF | Capacitor_SMD:C_0805_2012Metric | C5, C6 |
| 2 | 5K1 | Resistor_SMD:R_0805_2012Metric | R2, R4 |
| 2 | 74LV1T08GV | Package_TO_SOT_SMD:SC-74A-5_1.55x2.9mm_P0.95mm | U7, U8 |
| 2 | BAT | TestPoint:TestPoint_Pad_D2.0mm | TP1, TP3 |
| 2 | ESDA5V3L | Package_TO_SOT_SMD:SOT-23-3 | ESD1, ESD2 |
| 2 | GND | TestPoint:TestPoint_Pad_D2.0mm | TP2, TP4 |
| 2 | SW_Push | Footprints:MX_HS_2u | SW28, SW98 |
| 2 | SW_Push | Footprints:MX_HS_2.25u | SW57, SW59 |
| 2 | SW_Push | Footprints:MX_HS_1.75u | SW45, SW70 |
| 2 | SW_Push | Footprints:MX_HS_1.5u | SW30, SW43 |
| 2 | SW_Push | Footprints:MX_HS_2u_90deg | SW90, SW97 |
| 1 | 10uH | Inductor_SMD:L_0805_2012Metric | L1 |
| 1 | 110k | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | 15k | Resistor_SMD:R_0805_2012Metric | R13 |
| 1 | 22uH | Footprints:IND-SMD_L7.1-W6.6 | L2 |
| 1 | 2K | Resistor_SMD:R_0805_2012Metric | R15 |
| 1 | Conn_02x03_Odd_Even | Connector_PinHeader_1.00mm:PinHeader_2x03_P1.00mm_Vertical | J2 |
| 1 | D | Footprints:SS34 | SS34 |
| 1 | MCP23017_ML | Package_DFN_QFN:QFN-28-1EP_6x6mm_P0.65mm_EP4.25x4.25mm | U6 |
| 1 | MCP73831-2-OT | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | MDBT50Q-1MV2 | RF_Module:Raytac_MDBT50Q | U3 |
| 1 | MT3608 | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm_CircularMountingHoles | RE1 |
| 1 | SH1106 | Footprints:OLED-TH_L38.0-W12.0_HS91L02W2C01 | Brd1 |
| 1 | SH1106 | Footprints:128x64OLED | Brd2 |
| 1 | SW_Push | Footprints:MX_HS_6u | SW76 |
| 1 | SW_SPDT | Footprints:1825232-1 | SPDT1 |
| 1 | USB6B1 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | USB_C_Receptacle_USB2.0_14P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | XIAO-nRF52840-SMD | Footprints:modified-XIAO-nRF52840-SMD | U5 |
Questions
How big is the Keyboard PCB?
It measures 409.5 × 137 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Keyboard use?
373 parts, built around the MDBT50Q-1MV2, MT3608, 74LV1T08GVH and USB6B1. 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 Keyboard KiCad files?
From the GlassyBridge/Keyboard repository on GitHub, at the commit this page was made from: the board is PCB/Keyboard.kicad_pcb and its schematic PCB/Keyboard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Keyboard 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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