Krunchboard

krunchiekrunch·krunchboard·kicad-pcb/keyboard/krunchboard.kicad_pcb

About the Krunchboard PCB

Krunchboard is an open source RP2040/RP2350 PCB design by krunchiekrunch, published on GitHub under the Custom license license. It is a 2-layer board measuring 427.6 × 139.1 mm, with 200 components from 15 distinct parts.

Its main chip is the RaspberryPi_Pico, from the RP2040/RP2350 family. Other key parts include the MCP23017_SO. By type, the board carries 100 diodes, 94 switches, 2 connectors, 2 resistors, 1 IC and 1 module.

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

From the project

A custom 80% ISO mechanical keyboard powered by a Raspberry Pi Pico with KMK

Prod V1 of the PCB has its I2C lines flipped for the 0.91" OLED Display and MCP23017

Krunchboard, from the project README — From the project README

Main components on the Krunchboard

MCP23017_SO RaspberryPi_Pico

Krunchboard bill of materials (BOM)

200 components, 15 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	MCP23017_SO	SOIC-28W_7.5x17.9mm_P1.27mm	U1
1	RaspberryPi_Pico	RaspberryPi_Pico_SMD_HandSolder	A1
2	Conn_01x04_Pin	PinSocket_1x04_P2.54mm_Vertical	J1, J2
79	SW_Push_45deg	Hotswap_MX_Plated_1.00u	SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +71
1	SW_Push_45deg	Hotswap_MX_Plated_2.00u	SW30
1	SW_Push_45deg	Hotswap_MX_Plated_1.50u	SW35
1	SW_Push_45deg	Hotswap_MX_Plated_1.75u	SW52
1	SW_Push_45deg	Hotswap_MX_Plated_ISOEnter	SW65
8	SW_Push_45deg	Hotswap_MX_Plated_1.25u	SW67, SW82, SW83, SW84, SW86, SW87, SW88, SW89
1	SW_Push_45deg	Hotswap_MX_Plated_2.75u	SW79
1	SW_Push_45deg	Hotswap_MX_Plated_6.25u	SW85
1	RotaryEncoder_Switch	RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm	SW94
94	1N4148W	D_SOD-123	D1, D2, D3, D4, D5, D6, D7, D8 +86
6	LED_SK6812MINI	SK6812-MINI-E	D95, D96, D97, D98, D99, D100
2	R4.7k	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R1, R2

Krunchboard design files

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

Layoutkicad-pcb/keyboard/krunchboard.kicad_pcb
Schematickicad-pcb/keyboard/krunchboard.kicad_sch
BOMBOM.csv

Krunchboard: common questions

What microcontroller does the Krunchboard use?

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

How big is the Krunchboard PCB?

The Krunchboard measures 427.6 × 139.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Krunchboard?

200 components, from 15 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 Krunchboard design files?

From the krunchiekrunch/krunchboard 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 Krunchboard design in my own project?

It is published under Custom license, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Krunchboard 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.