2 layers191 × 85 mm
Sub panel
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
135 parts3kApache-2.0
4 layers234 × 84 mm
Main panel
google/mozc-devices3kCircuit diagrams and firmware source code for Gboard DIY keyboards
- Size
- 234 × 84 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 234
- Nets
- 30
- Pads
- 1,251
- Tracks, vias
- 4,572, 324
- Pours
- 18
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 25 Mar 2015
- Updated
- 1 Oct 2026
Overview
Main panel is an open-source printed circuit board by google, from the google/mozc-devices repository on GitHub, published under the Apache-2.0 licence. It is a 4-layer board of 234 × 84 mm with 234 parts on 30 nets, routed with 4,572 tracks and 324 vias.
It is built around the STM32F042F4P6, CD4148WSP and SK6812MINI-E, with the CPG151101S11-1, HC-ZH1.5-8AW and S7B-ZR-3.4(LF)(SN) among its other parts. Its parts include 72 diodes, 54 connectors, 36 resistors, 36 switches and 9 capacitors. It belongs with the keyboards and input boards and the STM32 boards of this library.
Main components
6
STM32F042F4P6
TSSOP-20(4.4x6.4)-40℃~+85℃ 1.65V~3.6V 12bit 16 16KB 32 Bit 48MHz 6KB ARM Cortex-M0 Built-in FLASH TSSOP-20 Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
CD4148WSP
08051 Independent 1.25V@100mA 150mA 1A 200mW 4ns 5uA@75V 75V 0805 Switching Diodes ROHSLIZSwitching Diodes
SK6812MINI-E
SMD-40℃~+85℃ 0.6mA 1.78mm 120mcd~240mcd 120° 160mcd~320mcd 1kHz 2.8mm 2000V 3.2mm 3.7V~5.5V 460nm~470nm 515nm~525nm 620nm~625nm 800Kbit/s 815mcd~1275mcd Semi-transparent lens SMD RGB LEDs(Built-in IC) ROHSOPSCO OptoelectronicsRGB LEDs(Built-In IC)CPG151101S11-1
SMD- Mechanical Keyboard Shaft ROHSKailhMechanical Keyboard Shaft
HC-ZH1.5-8AW
弯插,P=1.5mm-25℃~+85℃ 1 1.5mm 100V 13.5mm 1A 1x8P 3.7mm 8 8P Brass K Pin PBT Right Angle Tin UL94V-0 ZH Push-Pull,P=1.5mm Wire To Board Connector ROHSHCTLWire To Board Connector
S7B-ZR-3.4(LF)(SN)
弯插,P=1.5mm-25℃~+85℃ 1 1.5mm 12mm 1A 1x7P 3.7mm 50V 6mm 7 7P Brass Glass-Fiber Reinforced PA66 Right Angle Tin UL94V-0 White ZH 弯插,P=1.5mm Wire To Board Connector ROHSJSTWire To Board Connector
README
README.mdCircuit diagrams and firmware source code for Gboard DIY keyboards, previously known as Google Japanese Input / Gboard April Fools.
This is not an officially supported Google product.
Products
Please refer to the README in each directory for more details.
Parts
234| Qty | Value | Footprint | References |
|---|---|---|---|
| 36 | D | Diode_SMD:D_0805_2012Metric | D5, D5, D5, D5, D5, D5, D5, D5, D5, D6, D6, D6, D6, D6, D6, D6 +20 |
| 36 | SK6812MINIe | Library:SK6812MINIe (Reverse) | D1, D1, D1, D1, D1, D1, D1, D1, D1, D2, D2, D2, D2, D2, D2, D2 +20 |
| 36 | SW_Push | Library:Keyswitch | SW1, SW1, SW1, SW1, SW1, SW1, SW1, SW1, SW1, SW2, SW2, SW2, SW2, SW2, SW2, SW2 +20 |
| 18 | 1K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R3, R3, R3, R3, R3, R3, R3, R3, R4, R4, R4, R4, R4, R4, R4 +2 |
| 18 | 510 | Resistor_SMD:R_0402_1005Metric | R1, R1, R1, R1, R1, R1, R1, R1, R1, R2, R2, R2, R2, R2, R2, R2 +2 |
| 18 | CUT | Library:CUT | CUT1, CUT1, CUT1, CUT1, CUT1, CUT1, CUT1, CUT1, CUT1, CUT2, CUT2, CUT2, CUT2, CUT2, CUT2, CUT2 +2 |
| 9 | 0.1u | Capacitor_SMD:C_0402_1005Metric | C1, C1, C1, C1, C1, C1, C1, C1, C1 |
| 9 | Conn_Downstream | Library:JST_S8B_ZR | J3, J3, J3, J3, J3, J3, J3, J3, J3 |
| 9 | Conn_Proxy1 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J5, J5, J5, J5, J5, J5, J5, J5, J5 |
| 9 | Conn_Proxy2 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J6, J6, J6, J6, J6, J6, J6, J6, J6 |
| 9 | Conn_SWD | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1, J1, J1, J1, J1, J1, J1, J1, J1 |
| 9 | Conn_Upstream | Library:JST_S8B_ZR | J2, J2, J2, J2, J2, J2, J2, J2, J2 |
| 9 | JST_ZH_7P | Library:JST_S7B_ZR | J4, J4, J4, J4, J4, J4, J4, J4, J4 |
| 9 | STM32F042F4Px | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U1, U1, U1, U1, U1, U1, U1, U1, U1 |
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Questions
How big is the Main panel PCB?
It measures 234 × 84 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Main panel use?
234 parts, built around the STM32F042F4P6, CD4148WSP, SK6812MINI-E and CPG151101S11-1. 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 Main panel KiCad files?
From the google/mozc-devices repository on GitHub, at the commit this page was made from: the board is mozc-doublesided/board/main_panel/main_panel.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Main panel design in my own project?
Its repository publishes it under the Apache-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).