Doom keycap hardware

rsheldiii·doom-keycap-hardware·Doom Keycap Kicad/Doom Keycap/Doom Keycap.kicad_pcb

About the Doom keycap hardware PCB

Doom keycap hardware is an open source RP2040/RP2350 PCB design by rsheldiii, published on GitHub under the MIT license. It is a 2-layer board measuring 32.5 × 15.5 mm, with 33 components from 21 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the NCP1117ST33T3G, W25Q128JVSIQ, 2328702-8 and MAX98357AETE+T. By type, the board carries 14 capacitors, 8 resistors, 5 ICs, 2 connectors, 2 diodes and 1 crystal.

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

From the project

Kicad and Fusion360 files for the Doom Keycap

Here are all the files associated with the hardware for the Doom Keycap. If you're looking for the code, it's here.

I had every intention of fabricating and selling these myself, but I got caught up on how to manufacture the keycap itself without A. breaking the bank, or B. doing a group buy before realizing my design wasn't feasible. With that, coupled with (happy) life events, I decided to open-source the hardware now.

Doom keycap hardware, from the project README — From the project README

Main components on the Doom keycap hardware

NCP1117ST33T3G W25Q128JVSIQ RP20402328702-8MAX98357AETE+T

Doom keycap hardware bill of materials (BOM)

33 components, 21 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	NCP1117ST33T3G NCP1117-3.3_SOT223	SOT-223-3_TabPin2	U1
1	W25Q128JVSIQ W25Q128JVS	SOIC-8_5.23x5.23mm_P1.27mm	U2
1	RP2040	RP2040-QFN-56	U3
1	2328702-8 ST7735s_8	2328702-8	U4
1	MAX98357AETE+T	MAX98357AETE-T	U5
1	403C35D12M00000 ABLS-12.000MHZ-B4-T	403C35D12M00000	Y1
1	USB4105-GF-A USB_B_Micro	USB_Micro-B_Amphenol_10103594-0001LF_Horizontal_modified	J1
1	CONN_01X16_SOCKET Conn_01x02	SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm	J2
1	CMS-131304-SMT Speaker	SMS-1308MS-2-R	LS1
1	KT-0603W LED	LED_0603_1608Metric	D1
1	D_Schottky	D_0402_1005Metric	D2
4	CL05A106MQ5NUNC 10u	C_0402_1005Metric	C1, C4, C9, C17
2	0402CG270J500NT 27p	C_0402_1005Metric	C2, C3
4	CL05B104KO5NNNC 100n	C_0402_1005Metric	C5, C6, C7, C11
2	CL05A105KA5NQNC 1u	C_0402_1005Metric	C8, C10
2	0402B221K500NT 220p	C_0402_1005Metric	C12, C13
3	0402WGF1001TCE 1k	R_0402_1005Metric	R1, R5, R8
1	DNF	R_0402_1005Metric	R2
2	RC0402FR-0727RL 27	R_0402_1005Metric	R3, R4
1	0402WGF1003TCE 100k	R_0402_1005Metric	R6

Show 1 more

Qty	Part	Footprint	Refs
1	RC0402FR-07680KL 680k	R_0402_1005Metric	R7

Doom keycap hardware design files

The KiCad project lives in the rsheldiii/doom-keycap-hardware repository on GitHub; these links point at the commit this page was built from.

Doom keycap hardware: common questions

What microcontroller does the Doom keycap hardware use?

The Doom keycap hardware is built around the RP2040, from the RP2040/RP2350 family.

How big is the Doom keycap hardware PCB?

The Doom keycap hardware measures 32.5 × 15.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Doom keycap hardware?

33 components, from 21 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 Doom keycap hardware design files?

From the rsheldiii/doom-keycap-hardware 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 Doom keycap hardware design in my own project?

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

Can I test firmware for the Doom keycap hardware 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.