MiniRazz

purdeaandrei·MiniRazz·controller/controller.kicad_pcb

About the MiniRazz PCB

MiniRazz is an open source RP2040/RP2350 PCB design by purdeaandrei, published on GitHub under the CERN-OHL-P-2.0 license. It is a 4-layer board measuring 142.2 × 48 mm, with 55 components from 23 distinct parts.

Its main chip is the C2040, from the RP2040/RP2350 family. Other key parts include the C82317, C5613, C2827654 and C5446. By type, the board carries 20 capacitors, 16 resistors, 6 connectors, 5 ICs, 3 inductors and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

MiniRazz - open hardware controller replacement for the Unicomp Mini M keyboard

This is a replacement keyboard controller, for the Unicomp Mini M keyboard, this is an independent community project that is not endorsed by Unicomp, and it is not related to any official controller sold by them.

Cost analysis at the time of writing (2024 Aug 11):

VIAL-QMK and ZMK firmwares are available, (plain QMK upstreaming will also be attempted).

Use unicompminimminirazzvial.uf2 or unicompminimminirazzvialdebug.uf2`

MiniRazz, from the project README — From the project README

Main components on the MiniRazz

C2040 C82317 C5613 C2827654 C5446

MiniRazz bill of materials (BOM)

55 components, 23 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	C2040 RP2040	QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm	U1
1	C82317 W25Q16JV	SOIC-8_5.275x5.275mm_P1.27mm	U2
1	C5613 74HC165	SOIC-16_3.9x9.9mm_P1.27mm	U3
1	C2827654 USBLC6-2SC6	SOT-23-6	U4
1	C5446 XC6206P332MR	SOT-23	U6
1	C9002 12MHz	Crystal_SMD_3225-4Pin_3.2x2.5mm_HandSoldering	Y1
1	C3197751 USB_A	LUSB_A111_00	J1
2	C7191217 Conn_01x16	TE_connectivity_AMP_6-520314-6	J2, J3
1	C706867 3.3V IO EXPANSION HEADER	PinHeader_2x03_P2.54mm_Vertical_3dhorizontal	J4
1	Conn_01x03	PinHeader_1x03_P2.54mm_Vertical	J5
1	Conn_01x01	PinHeader_1x01_P2.54mm_Vertical_3dhorizontal	J13
3	SMTAssemblyMountingHole	tooling_hole	H1, H2, H3
1	C92584 SW_Push	switch_K2-1187SQ-A4SW-06	SW1
3	C1015 Ferrite_Bead	L_0805_2012Metric_Pad1.15x1.40mm_HandSolder	FB1, FB2, FB3
4	C52923 1uF	C_0402_1005Metric	C1, C2, C21, C25
12	C1525 100nF	C_0402_1005Metric	C3, C12, C14, C15, C16, C17, C18, C19 +4
2	C1570 30pF	C_0402_1005Metric	C8, C10
2	C415393 43pF	C_0402_1005Metric	C9, C11
2	C284479 27.4	R_0402_1005Metric	R3, R4
2	C11702 1k	R_0402_1005Metric	R5, R19

Show 3 more

Qty	Part	Footprint	Refs
1	C25744 10k	R_0402_1005Metric	R6
8	C36871 68k	R_0402_1005Metric	R7, R8, R9, R10, R11, R12, R13, R14
3	C270631 196	R_0402_1005Metric	R15, R16, R17

MiniRazz design files

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

Layoutcontroller/controller.kicad_pcb
Schematiccontroller/controller.kicad_sch
BOMorder/controller_bom_jlc.csv

MiniRazz: common questions

What microcontroller does the MiniRazz use?

The MiniRazz is built around the C2040, from the RP2040/RP2350 family.

How big is the MiniRazz PCB?

The MiniRazz measures 142.2 × 48 mm, has 4 copper layers and is 1.6062 mm thick.

How many components are on the MiniRazz?

55 components, from 23 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 MiniRazz design files?

From the purdeaandrei/MiniRazz 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 MiniRazz design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which purdeaandrei chose for the repository.

Can I test firmware for the MiniRazz 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.