2 layers97 × 78.5 mm
Dumbpad
imchipwood/dumbpad
Simple 4x4 numpad with rotary encoder. Powered by QMK via ATmega32u4 Pro Micro
45 parts517GPL-2.0
2 layers97 × 78.5 mm
Dumbpad
imchipwood/dumbpad517Simple 4x4 numpad with rotary encoder. Powered by QMK via ATmega32u4 Pro Micro
- Size
- 97 × 78.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 62
- Nets
- 58
- Pads
- 261
- Tracks, vias
- 337, 37
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 3 Jul 2019
- Updated
- 4 Mar 2026
Overview
Dumbpad is an open-source printed circuit board by imchipwood, from the imchipwood/dumbpad repository on GitHub, published under the GPL-2.0 licence. It is a 2-layer board of 97 × 78.5 mm with 62 parts on 58 nets, routed with 337 tracks and 37 vias.
It is built around the SK6812MINI-E. Its parts include 36 diodes, 17 switches and 3 resistors. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
hotswap_rgb/README.mddumbpad - Hotswap - RGB (aka v3x)
Designed by deveth0.
Description
Version of the original dumbpad that features Kailh Hotswap Sockets and (optional) RGB per-key lightning.
Revisions
- 3.1 Initial published PCB
dumbpad v3.1
Renders
Bill of materials
- 16x Kailh Hotswap Sockets (rev 2)
- 16x Cherry-style mechanical switches
- 17x 1n4148 diodes (thru hole)
- 1x Arduino Pro Micro or pin-compatible ATmega32u4-based MCU
- 1x EC11 rotary encoder with pushbutton (7-pin)
- (optional) 16x SK6812 mini e LEDs
- (optional) 1x 6mm tactile switch (to reset MCU)
- (optional) 3x 3mm LEDs (whatever color)
- (optional) 3x 330ohm or similar resistors for the LEDS (not needed if not adding LEDs)
Making the PCB
Submit either the KiCad .kicad_pcb or the gerber files to your prefered PCB manufacturer.
Notes on soldering
It's recommended to start with the Sockets and then add the remaining parts.
Solder the SK6812 LEDs with the missing corners aligned with the corners printed on the PCB as shown in the image.
NOTE: the orientation of the LEDs changes between the lines!
Acknowledgements
Some of the footprints are extracted from the awesome Corne Keyboard by Kosuke Adachi.
Parts
62| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | DIODEDO-1N4148 | dumbpad:DO-1N4148 | D1, D2, D3, D4, D5, D6, D7, D8, D10, D11, D12, D13, D14, D15, D16, D20 +1 |
| 16 | MOMENTARY-SWITCH-SPST-LED-PTH-CHERRY | Keyswitch:Kailh-CPG151101S11_MX_Socket-1.00u | S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16 |
| 16 | SK6812MINI | Library:YS-SK6812MINI-E | LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9, LED10, LED11, LED12, LED13, LED14, LED15, LED16 |
| 3 | 330 | dumbpad:AXIAL-0.3 | R1, R2, R3 |
| 3 | LED3MM | dumbpad:LED_3MM | D17, D18, D19 |
| 1 | CHERRY-MX-ENCODER | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | RE_3_1 |
| 1 | MOMENTARY-SWITCH-SPST-PTH-6.0MM | dumbpad:TACTILE_SWITCH_PTH_6.0MM | S17 |
| 1 | SPARKFUN_PRO_MICRO | dumbpad:SPARKFUN_PRO_MICRO | B1 |
The 58 most common of 62 parts.
More from imchipwood/dumbpad
2- 2 layers97 × 78.5 mm
Dumbpad
imchipwood/dumbpad
Simple 4x4 numpad with rotary encoder. Powered by QMK via ATmega32u4 Pro Micro
41 parts517GPL-2.0
Similar boards
- 4 layers234 × 84 mm
Main panel
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
234 parts3kApache-2.0 - 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 - 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
- 4 layers347 × 156.1 mm
ENV KB RGB
Envious-Data/Env-KB
A custom mechanical keyboard inspired by the CFTKB Mysterium utilizing the Raspberry Pi Pico
377 parts256GPL-3.0
Questions
How big is the Dumbpad PCB?
It measures 97 × 78.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Dumbpad use?
62 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 Dumbpad KiCad files?
From the imchipwood/dumbpad repository on GitHub, at the commit this page was made from: the board is hotswap_rgb/dumbpad.kicad_pcb and its schematic combo_low_profile_oled/dumbpad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Dumbpad design in my own project?
Its repository publishes it under the GPL-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).