4 layers91.8 × 94.5 mm
2 layers100 × 123.8 mm
Keyboard
WilliamLim781/PCB_practice1- Size
- 100 × 123.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 61
- Nets
- 63
- Pads
- 279
- Tracks, vias
- 551, 78
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 18 Sep 2023
- Updated
- 2 Nov 2026
Overview
Keyboard is an open-source printed circuit board by WilliamLim781, from the WilliamLim781/PCB_practice repository on GitHub. It is a 2-layer board of 100 × 123.8 mm with 61 parts on 63 nets, routed with 551 tracks and 78 vias.
It is built around the ATMEGA32U4-AU and USBLC6-2SC6. Its parts include 18 switches, 17 diodes, 9 capacitors, 7 resistors and 3 connectors. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATMEGA32U4-AU
QFP-44(10x10)-40℃~+85℃ 10bit 16MHz 1KB 2.5KB 2.7V~5.5V 26 32KB 8 Bit AVR Built-in FLASH QFP-44(10x10) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
README
README.mdPCB_practice
just a bunch of PCB practice. That's it
Parts
61| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | D | Diode_SMD:D_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1, D2, D3, D4, D5, D6, D7, D8, D10, D11, D12, D13, D14, D15, D17, D18 +1 |
| 14 | SW_Push | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_MX_1.00u | SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW10, SW11, SW12, SW13, SW14, SW15, SW19 |
| 4 | 100n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3, C4, C5, C8 |
| 4 | MountingHole | MountingHole:MountingHole_4.3mm_M4 | H1, H2, H3, H4 |
| 2 | 22 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R3 |
| 2 | 22p | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C6, C7 |
| 2 | 2k2 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R6, R7 |
| 2 | 5k1 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R5 |
| 2 | SW_Push | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_MX_2.00u_90deg | SW9, SW18 |
| 1 | 10 uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C9 |
| 1 | 16 MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm_HandSoldering | Y1 |
| 1 | 1u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1 |
| 1 | ATmega32U4-A | Package_QFP:TQFP-44_10x10mm_P0.8mm | U1 |
| 1 | I2C | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J3 |
| 1 | JTAG 10 | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J2 |
| 1 | RST | Button_Switch_SMD:SW_SPST_PTS645 | SW1 |
| 1 | SW_Push | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_MX_2.00u | SW16 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U2 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
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Questions
How big is the Keyboard PCB?
It measures 100 × 123.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Keyboard use?
61 parts, built around the ATMEGA32U4-AU and USBLC6-2SC6. 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 WilliamLim781/PCB_practice repository on GitHub, at the commit this page was made from: the board is keyboard/keyboard.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Keyboard design in my own project?
Its repository states no licence, so its author keeps all rights: ask WilliamLim781 before reusing the design.