4 layers234 × 84 mm
Main panel
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
234 parts3kApache-2.0
2 layers88.2 × 64.8 mm
Hackpad++
0x62b/hackpadplusplus2hackpad pro max premium plus flip fold ultra 5G (6 key hotswappable rgb backlit wireless macropad with an encoder and oled)
- Size
- 88.2 × 64.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 32
- Pads
- 113
- Tracks, vias
- 231, 32
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 24 Apr 2026
- Updated
- 1 May 2026
Overview
Hackpad++ is an open-source printed circuit board by 0x62b, from the 0x62b/hackpadplusplus repository on GitHub. It is a 2-layer board of 88.2 × 64.8 mm with 23 parts on 32 nets, routed with 231 tracks and 32 vias.
It is built around the SK6812MINI-E. Its parts include 12 diodes, 7 switches and 2 ICs. It belongs with the keyboards and input and lEDs and displays boards and the nRF52 and nRF5x boards of this library.
Main components
1README
README.mdHackpad++
6-key hot-swappable RGB backlit macropad based on Seeed Studio Xiao NRF52840. Uses ZMK for firmware. 400mAh battery, supports wireless BLE HID operation. I made this to use up some spare parts and learn more about ZMK.
Rn the firmware is in a really really really stripped down state because I want to get the physical thing before trying to make more firmware since it keeps breaking the build
According to ZMK's power profiler we should get about 21 hours of battery life with the RGB at 20% brightness
Repo Structure
CAD files in cad/
KiCad design files in PCB/
Production gerbers in PCB/gerbers
Firmware in firmware/
BOM at bom.csv
Case Onshape design here
3D Models
https://grabcad.com/library/oled-0-91-128x32-1 https://grabcad.com/library/seeed-studio-xiao-nrf52840-sense-1 https://grabcad.com/library/kailh-polia-switch-cherry-mx-compatible-1 https://grabcad.com/library/11mm-metal-shaft-rotary-encoders-tht-vertical-w-push-on-switch-1 https://grabcad.com/library/dsa-keycap-for-cherry-mx-switches-1
Assembly
Prerequisites: solder the PCB and print the case
- put switches into sockets
- put PCB assembly into bottom case
- put top case over the assembly
- screw in the top case with M3 screws
- attach keycaps to switches
- flash firmware according to ZMK docs
- yay
Cost
BOM: 17.38 USD
PCB: 4 USD + 1.5 USD shipping
Total: 22.88 USD
| Item | Unit Price (AUD) | Quantity | Extended Price (AUD) | Extended Price(USD) | Notes | Link |
|---|---|---|---|---|---|---|
| Switches | 0 | 6 | 0 | 0 | Owned | https://www.aliexpress.com/item/1005007983672026.html |
| Hotswap sockets | 0 | 6 | 0 | 0 | Extra from keeb | https://www.aliexpress.com/item/1005007232040760.html |
| Diodes | 0 | 6 | 0 | 0 | Extra from keeb | https://www.aliexpress.com/item/1005006323468521.html |
| LEDs | 0 | 6 | 0 | 0 | Owned - link is example | https://www.aliexpress.com/item/1005005193716172.html |
| Xiao | 19.25 | 1 | 19.25 | 13.77 | ITS CHEAPER THAN ALIEXPRESS IVE CHECKED | https://core-electronics.com.au/seeed-studio-xiao-nrf52840-pre-soldered-bluetooth-5-0-ble-wireless-iot-microcontroller-board.html |
| Keycaps | 0 | 6 | 0 | 0 | Owned - link is example | https://aliexpress.com/item/1005011909872629.html |
| OLED | 0 | 1 | 0 | 0 | Owned | https://www.lcsc.com/product-detail/C5248081.html |
| Battery | 5.05 | 1 | 5.05 | 3.61 | N/A | https://core-electronics.com.au/polymer-lithium-ion-battery-400mah-38456.html |
| M3 heatset inserts | 0 | 4 | 0 | 0 | owned | N/A |
| M3x10 screws | 0 | 4 | 0 | 0 | owned | N/A |
| PCB | N/A | 1 | N/A | 6.5 | N/A | https://jlcpcb.com |
Images
Schematic
PCB layout
PCB render
Full render
Zine page
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | D | Diode_SMD:D_SOD-123 | D1, D2, D3, D4, D5, D6 |
| 6 | SK6812MINI-E | LED_SMD:LED_SK6812MINI-E_3.2x2.8mm_P1.5mm_ReverseMount | D10, D11, D12, D13, D14, D15 |
| 6 | SW_Push | MX_Hotswap:MX-Hotswap-1U | SW1, SW2, SW3, SW4, SW5, SW6 |
| 1 | BAT | TestPoint:TestPoint_Pad_2.0x2.0mm | TP1 |
| 1 | ER_OLEDM0.91_1x-I2C | Display:ER_OLEDM0.91_1x-I2C | U2 |
| 1 | GND | TestPoint:TestPoint_Pad_2.0x2.0mm | TP2 |
| 1 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW10 |
| 1 | XIAO-nRF52840-SMD | Seeed Studio XIAO Series Library:XIAO-nRF52840-SMD | U3 |
Questions
How big is the Hackpad++ PCB?
It measures 88.2 × 64.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Hackpad++ use?
23 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 Hackpad++ KiCad files?
From the 0x62b/hackpadplusplus repository on GitHub, at the commit this page was made from: the board is PCB/Hackpad++.kicad_pcb and its schematic PCB/Hackpad++.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Hackpad++ design in my own project?
Its repository states no licence, so its author keeps all rights: ask 0x62b before reusing the design.
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