2 layers216 × 70.8 mm
Choc40
rainkeebs/Choc40
40% Low profile keyboard designed for Kailh 'Choc' v1 switches and MBK Extended keycaps.
98 parts15Unlicense
2 layers19.1 × 23.3 mm
PCB for the 1key gasket mounted why macropad
- Size
- 19.1 × 23.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 20
- Nets
- 36
- Pads
- 88
- Tracks, vias
- 119, 17
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20210824)
- Created
- 8 Mar 2021
- Updated
- 19 May 2026
Overview
Why is an open-source printed circuit board by lfgberg, from the lfgberg/why-PCB repository on GitHub. It is a 2-layer board of 19.1 × 23.3 mm with 20 parts on 36 nets, routed with 119 tracks and 17 vias.
It is built around the ATMEGA32U2-MU and PRTR5V0U2X. Its parts include 6 resistors, 1 capacitor, 1 IC, 1 diode and 1 crystal. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATMEGA32U2-MU
VQFN-32-EP(5x5)-40℃~+85℃ 16MHz 1KB 1KB 2.7V~5.5V 22 32KB 8 Bit AVR Built-in FLASH Power-on reset (POR)、Undervoltage detection (BOR/LVD/LVR/LVI)、Watchdog reset、External pin reset (NRST)、Built-in general-purpose timer VQFN-32-EP(5x5) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
PRTR5V0U2X
SOT-143-55℃~+125℃ 0.3pF、0.8pF 100W 10V、15V 5V 6.5V 6A 80nA ESD IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 Three channels Unidirectional SOT-143 ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
README
README.mdThis has not yet been tested, and firmware has not yet been pushed to qmk/via, pcb may or may not function as intended
Why PCB
PCB designed for the why 1-key gasket mounted macropad. This needs decoupling caps added because I forgot them. It hasn't been produced or tested.
Renders
Contributing
I don't plan on finishing this, you can feel free!
Production
Download the latest release of the production files, and submit them to a PCB manufacturer like JLCPCB or PCBWay.
Author
License
Attribution-NonCommercial-ShareAlike 4.0 International
This is not available for commercial use, contact Lfgberg for more information.
Parts
20| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 10k | Footprints:R_0402_1005Metric | R1, R6 |
| 2 | 22 | Footprints:R_0402_1005Metric | R2, R3 |
| 2 | 5.1k | Footprints:R_0402_1005Metric | R4, R5 |
| 2 | LOGO | Footprints:4.1-mm-dn-silk | G***, G*** |
| 2 | LOGO | Footprints:3.7x3.7mm-lg-copper | G***, G*** |
| 2 | LOGO | Footprints:why | G***, G*** |
| 1 | 1Uf | Footprints:C_0504_1310Metric | C3 |
| 1 | 500m | Footprints:Fuse_0805_2012Metric | F1 |
| 1 | ATmega32U2-MU | Footprints:QFN-32-1EP_5x5mm_P0.5mm_EP3.1x3.1mm | U1 |
| 1 | HRO-TYPE-C-31-M-12 | Footprints:HRO-TYPE-C-31-M-12 | USB1 |
| 1 | Jumper | Footprints:C_0402_1005Metric | JP1 |
| 1 | MX-NoLED | Footprints:MXOnly-1U-NoLED-3pin | MX1 |
| 1 | PRTR5V0U2X | Footprints:SOT-143 | D1 |
| 1 | Resonator_Small | Footprints:Resonator_SMD_muRata_CSTxExxV-3Pin_3.0x1.1mm | Y1 |
Questions
How big is the Why PCB?
It measures 19.1 × 23.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Why use?
20 parts, built around the ATMEGA32U2-MU and PRTR5V0U2X. 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 Why KiCad files?
From the lfgberg/why-PCB repository on GitHub, at the commit this page was made from: the board is KiCad/why.kicad_pcb and its schematic KiCad/why.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Why design in my own project?
Its repository states no licence, so its author keeps all rights: ask lfgberg before reusing the design.
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