4 layers234 × 84 mm
Main panel
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
234 parts3kApache-2.0
2 layers84.2 × 80.2 mm
Pad thing
Crystallized21/pad-thing1Also I wanted to learn something new and get some hardware skills in, so this is a first step for me. Making my own PCB, trying out Fusion 360 for the first time and even coding my own firmware cause I like control! 😈
- Size
- 84.2 × 80.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 38
- Nets
- 38
- Pads
- 164
- Tracks, vias
- 260, 28
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 2 Jul 2025
- Updated
- 8 Aug 2026
Overview
Pad thing is an open-source printed circuit board by Crystallized21, from the Crystallized21/pad-thing repository on GitHub. It is a 2-layer board of 84.2 × 80.2 mm with 38 parts on 38 nets, routed with 260 tracks and 28 vias.
It is built around the SK6812MINI-E. Its parts include 24 diodes, 12 switches, 1 IC and 1 connector. It belongs with the RP2040 boards of this library.
Main components
1README
README.mdCrystallized's Pad Thing
This macro pad contains 12 keys, each containing RGB underglow and has a OLED Screen! This macropad uses QMK Firmware.
What and Why?
I wanted to build my own macropad for at least for some uses cases. I couldn't think of any so I decided to emulating a mouse with this! Therefore I can control the mouse using "the keyboard" if you know what I mean! This could change in the near future when I can add modifiers to change between different key modes for different work flows!
Also I wanted to learn something new and get some hardware skills in, so this is a first step for me. Making my own PCB, trying out Fusion 360 for the first time and even coding my own firmware cause I like control! 😈
BOM
- XIAO RP2040
- 12x 1N4148 Diodes
- 0.91 inch OLED Display
- 12x SK6812 RGB LEDs for each key.
- 12x Cherry MX Switches
- 4x M3x16 Bolt
- 4x M3 Heatset
- 12x Blank DSA Keycaps
CAD Model
Schematic
PCB
Parts
38| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | Diode | ScottoKeebs_Components:Diode_DO-35 | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12 |
| 12 | Keyswitch | ScottoKeebs_MX:MX_PCB_1.00u | S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12 |
| 12 | SK6812MINI | ScottoKeebs_Components:LED_SK6812MINI | D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24 |
| 1 | OLED_128x32 | ScottoKeebs_Components:OLED_128x32 | J1 |
| 1 | XIAO-RP2040-DIP | OPL:XIAO-RP2040-DIP | U1 |
Questions
How big is the Pad thing PCB?
It measures 84.2 × 80.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Pad thing use?
38 parts, built around the SK6812MINI-E. 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 Pad thing KiCad files?
From the Crystallized21/pad-thing repository on GitHub, at the commit this page was made from: the board is pcb/pad thing.kicad_pcb and its schematic pcb/OPL_Kicad_Library-master/Grove Vision AI V2 Library/Grove - Vision AI Module V2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Pad thing design in my own project?
Its repository states no licence, so its author keeps all rights: ask Crystallized21 before reusing the design.
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