4 layers99 × 53.3 mm
PSLab
fossasia/pslab-hardware
PSLab Hardware Design and Schematics https://pslab.io
199 parts1.7kApache-2.0
2 layers66 × 114 mm
Overpad
lastlxrd/overpad112-key QMK macropad with rotary encoder, OLED and RGB.
- Size
- 66 × 114 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 46
- Nets
- 48
- Pads
- 225
- Tracks, vias
- 311, 18
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 28 Sep 2026
- Updated
- 28 Sep 2026
Overview
Overpad is an open-source printed circuit board by lastlxrd, from the lastlxrd/overpad repository on GitHub, published under the GPL-2.0 licence. It is a 2-layer board of 66 × 114 mm with 46 parts on 48 nets, routed with 311 tracks and 18 vias.
It is built around the WS2812B. Its parts include 24 diodes, 14 switches, 2 resistors, 1 IC and 1 connector. It belongs with the keyboards and input and lEDs and displays boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
readme.mdOVERPAD
A custom 12-key mechanical macropad with a rotary encoder, OLED display and RGB, powered by QMK.
@lastlxrd · 2024
OVERPAD is a compact programmable macropad built around the ATmega32U4 and QMK Firmware.
Features
- 12 mechanical keys
- Rotary encoder with push button
- ATmega32U4 microcontroller
- 128×64 OLED display
- 12× WS2812 RGB LEDs
- QMK Firmware
- VIA support
- USB HID
- NKRO support
- Mouse keys and media controls
- Caterina bootloader
Hardware
| Component | Description |
|---|---|
| MCU | ATmega32U4 |
| Keys | 12 mechanical keys |
| Encoder | Rotary encoder with push button |
| Display | 128×64 OLED |
| RGB | 12× WS2812 LEDs |
| Firmware | QMK |
| Configuration | VIA |
| Bootloader | Caterina |
VIA configuration
OVERPAD supports VIA, allowing the keymap to be customized through a graphical interface without recompiling the firmware.
With VIA you can:
- Remap all 12 keys
- Configure multiple layers
- Assign media and system controls
- Create macros
- Change shortcuts and key functions
- Customize the layout without reflashing the firmware
The VIA definition is included in the repository:
How to customize OVERPAD with VIA
-
Connect OVERPAD to your computer via USB.
-
Open VIA.
-
If OVERPAD is detected automatically, open the Configure tab and start remapping the keys.
-
If the keyboard is not detected automatically, enable the Design tab in VIA settings.
-
Load:
-
Return to the Configure tab.
-
Select any key on the OVERPAD layout and assign the desired function.
Changes are written directly to the keyboard and take effect immediately.
OVERPAD must be running the VIA-enabled QMK firmware for VIA configuration to work.
Firmware
OVERPAD firmware is based on QMK Firmware.
The repository contains the keyboard configuration files:
.
├── config.h
├── keyboard.json
├── rules.mk
├── LICENSE
├── NOTICE
├── LICENSE-ASSETS.md
├── docs/
│ ├── overpad1.jpg
│ ├── overpad2.jpg
│ └── overpad3.jpg
└── README.mdTo use the keyboard definition inside a QMK installation, place it in:
qmk_firmware/keyboards/lastlxrd/overpad/A QMK keymap can then be placed inside:
keymaps/default/ and compiled with:
qmk compile -kb lastlxrd/overpad -km defaultor flashed with:
qmk flash -kb lastlxrd/overpad -km defaultA
keymaps/default/keymap.cfile is required to build a complete firmware image.
About
OVERPAD is an early custom hardware project developed in 2024.
The project combines PCB design, embedded firmware and mechanical keyboard hardware in a compact programmable controller.
License
OVERPAD firmware and keyboard configuration files are licensed under the GNU General Public License v2.0 or later (GPL-2.0-or-later).
The firmware is based on QMK Firmware, which is distributed under the GNU General Public License.
Original project photographs and media located in docs/ are not covered by the firmware license unless explicitly stated otherwise.
See LICENSE, NOTICE and LICENSE-ASSETS.md for details.
Author
Designed and developed by lastlxrd.
Parts
46| 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_Hotswap:Hotswap_MX_Plated_1.00u | S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12 |
| 12 | WS2812B | LED_SMD:LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm | D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24 |
| 2 | R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2 |
| 1 | Arduino_Pro_Micro | ScottoKeebs_MCU:Arduino_Pro_Micro | U1 |
| 1 | OLED_128x64 | ScottoKeebs_Components:OLED_128x64 | J2 |
| 1 | RotaryEncoder_Switch | ScottoKeebs_Scotto:Encoder_EC11_MX | SW1 |
| 1 | Switch | ScottoKeebs_Components:Button_MJTP1243 | SW2 |
The 42 most common of 46 parts.
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Questions
How big is the Overpad PCB?
It measures 66 × 114 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Overpad use?
46 parts, built around the WS2812B. 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 Overpad KiCad files?
From the lastlxrd/overpad repository on GitHub, at the commit this page was made from: the board is pcb/overpad.kicad_pcb and its schematic pcb/overpad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Overpad 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).