4 layers234 × 84 mm
Main panel
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
234 parts3kApache-2.0
2 layers87 × 42.8 mm
Pretpad
Pretlei/pretpad1a macropad for personal use!
- Size
- 87 × 42.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 9
- Nets
- 16
- Pads
- 67
- Tracks, vias
- 78, 5
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 15 Jun 2025
- Updated
- 31 Mar 2026
Overview
Pretpad is an open-source printed circuit board by Pretlei, from the Pretlei/pretpad repository on GitHub. It is a 2-layer board of 87 × 42.8 mm with 9 parts on 16 nets, routed with 78 tracks and 5 vias.
It is built around the SK6812MINI-E. Its parts include 5 switches, 2 diodes, 1 IC and 1 connector. It belongs with the keyboards and input boards and the RP2040 boards of this library.
Main components
1README
README.mdPretpad
Pretpad is a macropad for personal use. It has four keys, a rotary encoder with a switch, an oled screen, two LEDs, and uses QMK firmware. Keys opens browser, puts laptop to sleep, pause/play song, and skips song on Spotify. Rotary encoder controls volume and its switch mutes all audio. OLED Screen displays time since the macropad has been turned on, which usually correlates to time on screen.
CAD
I used 4 M3 bolts and nuts in my CAD. I don't have a soldering iron, but I hope to get one so I can use heatset inserts! It has two seperate printed pieces, a top and a bottom. Made in Fusion360.
PCB
Schematic:
PCB:
Firmware
Uses QMK firmware! Purpose of each part is outlined in the initial description. I'll change my firmware in the future if I find some features redundant.
BOM:
- 4x Cherry MX Switches
- 4x DSA Keycaps
- 4x M3x5x4 Heatset inserts
- 4x M3x16mm SHCS Bolts
- 2x WS2812B LEDs
- 1x 0.91" 128x32 OLED Display
- 1x EC11 Rotary Encoder
- 1x XIAO RP2040
- 1x Case (2 printed parts)
- 1x Custom PCB
Pictures of Work In Progress:
Project was left unfinished due to medical reasons.
Parts
9| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | SW_Push | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW1, SW2, SW3, SW4 |
| 2 | SK6812MINI | LED_SMD:LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm | D1, D2 |
| 1 | OLED_DISPLAY | OLEDScreenFootprint:SSD1306-0.91-OLED-4pin-128x32-footprint | J1 |
| 1 | RotaryEncoder_Switch | KnobFootprint:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm_CircularMountingHoles | SW5 |
| 1 | XIAO-RP2040-DIP | OPLFootprint:XIAO-RP2040-DIP | U1 |
Questions
How big is the Pretpad PCB?
It measures 87 × 42.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Pretpad use?
9 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 Pretpad KiCad files?
From the Pretlei/pretpad repository on GitHub, at the commit this page was made from: the board is PCB/Pretpad.kicad_pcb and its schematic PCB/Pretpad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Pretpad design in my own project?
Its repository states no licence, so its author keeps all rights: ask Pretlei before reusing the design.
Similar boards
- 4 layers180.8 × 300.3 mm
Dilemma
Bastardkb/Dilemma
The Dilemma is a vertical stagger low-profile keyboard with mods.
383 parts590 - 4 layers48 × 32 mm
FlatSat
Pwnsat/FlatSat
Flatsat v1.0 is a hardware based platform for aerospace cybersecurity research
106 parts575GPL-2.0 - 2 layers
Demo
adamws/kicad-kbplacer
KiCad plugin for automatic keyboard's key placement and routing
48 parts547GPL-3.0 - 2 layers97 × 78.5 mm
Dumbpad
imchipwood/dumbpad
Simple 4x4 numpad with rotary encoder. Powered by QMK via ATmega32u4 Pro Micro
62 parts517GPL-2.0 - 4 layers82.5 × 39.4 mm
V4head
makerforgetech/modular-biped
An open source framework for creating a bipedal modular companion robot.
26 parts493GPL-3.0 - 2 layers115.7 × 95.7 mm
- 4 layers70 × 54 mm
