Hackpad

SnaggingCobra·hackpad·PCB/CobraPad/CobraPad.kicad_pcb

About the Hackpad PCB

Hackpad is an open source RP2040/RP2350 PCB design by SnaggingCobra, published on GitHub under the MIT license. It is a 2-layer board measuring 99 × 99 mm, with 35 components from 7 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the ER_OLEDM0.91_1x-I2C. By type, the board carries 16 diodes, 9 switches, 8 capacitors and 2 ICs.

It belongs with the displays & leds and keyboards designs in this gallery.

From the project

CobraPad is a compact 8-key macro pad built around the Seeed XIAO RP2040, with a rotary encoder, SSD1306 OLED display, addressable RGB underglow, and a custom 3D-printed case. The board and case are treated as the source of truth, and the firmware is mapped directly to the actual

- MCU: Seeed XIAO RP2040 - Layout: 2 rows x 4 columns, 8-key matrix - Extras: rotary encoder with push switch, 128x32 OLED, 8 SK6812MINI-E LEDs - Firmware: CircuitPython - PCB: 2-layer custom board, 99 mm x 99 mm - Case: custom top and bottom enclosure designed for a fitted…

Hackpad, from the project README — From the project README

Main components on the Hackpad

RP2040 ER_OLEDM0.91_1x-I2C

Hackpad bill of materials (BOM)

35 components, 7 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	RP2040 MOUDLE-SEEEDUINO-XIAO	XIAO-Generic-Hybrid-14P-2.54-21X17.8MM	U1
1	ER_OLEDM0.91_1x-I2C	ER_OLEDM0.91_1x-I2C	U2
8	SW_Push	SW_Cherry_MX_1.00u_Plate	SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8
1	EC11-STYLE RotaryEncoder_Switch	RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm	SW9
8	1N4148	D_DO-35_SOD27_P7.62mm_Horizontal	D1, D2, D3, D4, D5, D6, D7, D8
8	SK6812MINI-E	LED_SK6812MINI-E_3.2x2.8mm_P1.5mm_ReverseMount	D9, D10, D11, D12, D13, D14, D15, D16
8	100nf	C_0603_1608Metric	C1, C2, C3, C4, C5, C6, C7, C8

Hackpad design files

The KiCad project lives in the SnaggingCobra/hackpad repository on GitHub; these links point at the commit this page was built from.

LayoutPCB/CobraPad/CobraPad.kicad_pcb
SchematicPCB/CobraPad/CobraPad.kicad_sch
BOMBOM.csv

Hackpad: common questions

What microcontroller does the Hackpad use?

The Hackpad is built around the RP2040, from the RP2040/RP2350 family.

How big is the Hackpad PCB?

The Hackpad measures 99 × 99 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Hackpad?

35 components, from 7 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Hackpad design files?

From the SnaggingCobra/hackpad repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Hackpad design in my own project?

Yes, under the terms of its MIT license, which SnaggingCobra chose for the repository.

Can I test firmware for the Hackpad without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.