Mad RP2040

Cimos·Mad_RP2040

About the Mad RP2040 PCB

Mad RP2040 is an open source RP2040/RP2350 PCB design by Cimos, published on GitHub under the MIT license. It is a 4-layer board measuring 77.2 × 86.4 mm, with 102 components from 25 distinct parts.

Its main chip is the SC0914(13), from the RP2040/RP2350 family. Other key parts include the ECMF02-2AMX6, NCP1117LPST33T3G and W25Q128JVSIQ. By type, the board carries 38 diodes, 22 capacitors, 17 switches, 14 resistors, 4 ICs and 3 connectors.

It belongs with the keyboards designs in this gallery.

From the project

Test RP2040 board for a larger keyboard project

A small RP2040-based keypad PCB. Originally a minimal 2-key board to build confidence with the RP2040 ahead of a full-size keyboard, it has since grown into a 4x4 "anything" keypad with a rotary encoder and per-key RGB.

Status: Rev B (4x4) — fabricated November 2025; controller, USB and SK6812MINI-E chain verified, but a matrix wiring error past row 1 / col 1 needs cut-and-bodge to fix on existing units. The fix is not yet in main, so fabbing from main today reproduces the same bodge. Rev A (2-key) was fabricated and tested; archived under resources/reva/`.

Mad RP2040, from the project README — From the project README

Main components on the Mad RP2040

ECMF02-2AMX6 NCP1117LPST33T3G W25Q128JVSIQ SC0914(13)

Mad RP2040 bill of materials (BOM)

102 components, 25 distinct parts.

Qty	Part	Footprint	Refs
1	ECMF02-2AMX6 STMicroelectronics	ST_UQFN-6L_1.5x1.7mm_P0.5mm	U2
1	NCP1117LPST33T3G NCP1117-3.3 onsemi	SOT-223-3_TabPin2	U3
1	W25Q128JVSIQ Winbond Electronics	SOIC-8_5.23x5.23mm_P1.27mm	U4
1	SC0914(13) RP2040 Raspberry Pi	QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm	U5
1	2N7002PV,115 Diodes Incorporated	SOT-666	Q1
1	ECS-2520MVLC-120-CN-TR ECS-2520MVLC-120-CN ECS Inc.	Oscillator_SMD_ECS_2520MV-xxx-xx-4Pin_2.5x2.0mm	X1
1	USB4105 USB_C_Receptacle GCT	USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal	J1
1	Conn_ARM_SWD_TagConnect_TC2030-NL	JST_SHL_SM05B-SHLS-TF_1x05-1MP_P1.00mm_Horizontal	J2
1	SM03B-GHS-TB TRS JST Sales America Inc.	JST_GH_SM03B-GHS-TB_1x03-1MP_P1.25mm_Horizontal	J3
1	RotaryEncoder_Switch	keyswitch_choc12_hotswap_1u_rotary_encoder_ec12	SW1
15	CPG151101S11 SW_SPST Adafruit Industries LLC	keyswitch_choc12_hotswap_1u	SW2, SW3, SW4, SW6, SW7, SW8, SW9, SW11 +7
1	EVPAA202K Panasonic Electronic Components	EVP-AA202K	SW100
16	1N4148W SMC Diode Solutions	D_SOD-123	D1, D2, D3, D4, D17, D18, D19, D20 +8
16	SK6812MINI-E SK6812_MINI_E Worldsemi	SK6812MINI-E	D6, D8, D10, D11, D22, D23, D24, D25 +8
1	RB520S30T5G RB520S30 onsemi	D_SOD-523	D7
5	SK6812MINI OPSCO OPTOELECTRONICS	SK6812MINI-012	D13, D15, D16, D41, D43
2	BLM18PG330SN1D Murata Electronics	L_0603_1608Metric	FB1, FB2
15	CC0603KPX7R9BB104 100nF YAGEO	C_0603_1608Metric	C1, C2, C6, C7, C10, C11, C12, C14 +7
5	CC0805KKX5R8BB106 10uF YAGEO	C_0805_2012Metric	C3, C4, C5, C9, C22
2	CC0603KRX5R8BB105 1uF YAGEO	C_0603_1608Metric	C13, C15

Show 5 more

Qty	Part	Footprint	Refs
4	RC0603FR-075K1L 5K1 YAGEO	R_0603_1608Metric	R1, R2, R3, R4
3	RC0603FR-0710KL 10K YAGEO	R_0603_1608Metric	R6, R7, R11
3	RC0603FR-0751KL 51K YAGEO	R_0603_1608Metric	R8, R9, R15
2	RC0603FR-071KL 1K YAGEO	R_0603_1608Metric	R10, R12
2	RC0603FR-0727RL 27R YAGEO	R_0603_1608Metric	R13, R14

Mad RP2040 design files

The KiCad project lives in the Cimos/Mad_RP2040 repository on GitHub; these links point at the commit this page was built from.

LayoutMad_RP2040.kicad_pcb
SchematicMad_RP2040.kicad_sch

Mad RP2040: common questions

What microcontroller does the Mad RP2040 use?

The Mad RP2040 is built around the SC0914(13), from the RP2040/RP2350 family.

How big is the Mad RP2040 PCB?

The Mad RP2040 measures 77.2 × 86.4 mm, has 4 copper layers and is 1.2 mm thick.

How many components are on the Mad RP2040?

102 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the Mad RP2040 design files?

From the Cimos/Mad_RP2040 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Mad RP2040 design in my own project?

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

Can I test firmware for the Mad RP2040 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.