2 layers85 × 63 mm Hackpad, the printed circuit board in 3D

Hackpad

A mechanical macropad featuring: - OLED display - Rotary encoder - LEDs (SK6812 MINI-E) - 6 mechanical switches (Cherry MX) - Custom PCB and 3D-printed case

Open in PCBKit

Size: 85 × 63 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 17
Nets: 24
Pads: 89
Tracks, vias: 151, 7
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 30 May 2025
Updated: 31 May 2025

Overview

Hackpad is an open-source printed circuit board by hjw1112, from the hjw1112/Hackpad repository on GitHub. It is a 2-layer board of 85 × 63 mm with 17 parts on 24 nets, routed with 151 tracks and 7 vias.

It is built around the 1N4148WT and SK6812MINI-E. Its parts include 8 diodes, 7 switches, 1 IC and 1 connector. It belongs with the RP2040 boards of this library.

Main components

README

README.md

macropad

A mechanical macropad featuring:

OLED display
Rotary encoder
LEDs (SK6812 MINI-E)
6 mechanical switches (Cherry MX)
Custom PCB and 3D-printed case

PCB Design

Schematic

PCB Layout

Case Design

3D printable enclosure designed to be assembled with M3 screws and heatset inserts.

Bottom Shell
Top Panel

The PCB is inserted into the bottom shell, and the top plate is secured using 4× M3x16mm screws.

Bill of Materials (BOM)

Component
MCU	Seeed XIAO RP2040
Switches	6 × Cherry MX
Diodes	6 × 1N4148
Rotary Encoder	EC11
Addressable LEDs	2 × SK6812 MINI-E
OLED Display	0.91 inch
Screws	4 × M3x16mm
Heatset Inserts	4 × M3x5×4mm
Case	3D printed (top & bottom)
PCB	Custom board

Firmware

Compatible with KMK Firmware See firmware/main.py for configuration.

Parts

Qty	Value	Footprint	References
6	1N4148WT	Diode_SMD:D_SOD-523	D3, D4, D5, D6, D7, D8
6	SW_Push	Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB	SW1, SW2, SW3, SW4, SW6, SW7
2	SK6812MINI	LED_SMD:LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm	D1, D2
1	RotaryEncoder_Switch	Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm	SW5
1	XIAO-RP2040-DIP	Seeed Studio XIAO Series Library:XIAO-RP2040-DIP	U1
1	~	KiCad-SSD1306-0.91-OLED-4pin-128x32.pretty-master:SSD1306-0.91-OLED-4pin-128x32	J1

Questions

How big is the Hackpad PCB?

It measures 85 × 63 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Hackpad use?

17 parts, built around the 1N4148WT and 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 hjw1112/Hackpad 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 hjw1112 before reusing the design.

Category and platform

RP2040

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/hjw1112-hackpad" title="Hackpad in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/hjw1112-hackpad.jpg" alt="Hackpad" width="1200" height="900">

A picture that opens the board, for a README

[![Hackpad](https://pcbkit.io/embed/boards/hjw1112-hackpad.jpg?size=s)](https://pcbkit.io/boards/hjw1112-hackpad)

Source

Repository: hjw1112/Hackpad
Board file: PCB/hackpad.kicad_pcb
Commit: e711255
Licence: Not stated

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