Key ripper

bschwind·key-ripper·pcb/key-ripper.kicad_pcb

About the Key ripper PCB

Key ripper is an open source RP2040/RP2350 PCB design by bschwind, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 285.8 × 116.7 mm, with 211 components from 114 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the TYPE-C-31-M-12, XC6206PXXXMR, W25Q128JVS, C318884 and PJ-320A. By type, the board carries 78 diodes, 75 switches, 20 capacitors, 9 resistors, 8 ICs and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

A keyboard personalized for myself, designed in KiCad, with custom firmware and a case, both written in Rust. Can sit on top of a macbook keyboard.

The RP2040 samples the QSPISS line on boot. If this line is low, it will boot into its USB bootloader mode (i.e. enumerate as a mass storage device so you can upload new firmware). If this line is high on boot, it will start reading program instructions from the quad-SPI flash chip.

Just some measurements I've written down for my own designs are: standard MX cutout - 14×14mm distance between switches (center to center) - 19.05mm (both vertically and horizontally) distance between caps - 0.95mm distance between cap and case side - 0.475mm

Main components on the Key ripper

RP2040 TYPE-C-31-M-12 XC6206PXXXMR W25Q128JVS C318884 PJ-320A USBLC6-2SC6

Key ripper bill of materials (BOM)

211 components, 114 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	RP2040	rp2040	U1
1	TYPE-C-31-M-12	simple-usb-c	U2
1	XC6206PXXXMR XC6206PxxxMR	SOT-23	U3
1	W25Q128JVS W25Q16JVUXIQ	w25q16jvuxiq	U4
1	C318884 USB Boot	tactile-switch	U5
1	C318884 Reset	tactile-switch	U6
1	PJ-320A	trrs-connector-pj320a	U7
1	USBLC6-2SC6	SOT-23-6	U8
1	C9002 12MHz - 20pF	Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	TLC_PSMD050	Fuse_0805_2012Metric	F1
1	L_SHIFT_STABILIZER	cherry_mx_stabilizer_2.00u	H1
1	SPACE_STABILIZER	cherry_mx_stabilizer_6.25u	H2
1	ENTER_STABILIZER	cherry_mx_stabilizer_2.00u	H3
1	BACKSPACE_STABILIZER	cherry_mx_stabilizer_2.00u	H4
1	Upper Left	threaded_insert_m3_24939	H5
1	Bottom Left	threaded_insert_m3_24939	H6
1	Upper Right	threaded_insert_m3_24939	H7
1	Bottom Right	threaded_insert_m3_24939	H8
1	Upper Left	m2_hex_spacer_passthrough	H9
1	Upper Right	m2_hex_spacer_passthrough	H10

Show 94 more

Qty	Part	Footprint	Refs
1	Bottom Left	m2_hex_spacer_passthrough	H11
1	Bottom Right	m2_hex_spacer_passthrough	H12
6	Edge M2 Spacer PassThrough	m2_hex_spacer_passthrough_edge	H13, H14, H15, H16, H17, H18
1	C2803348 ESC	cherry_mx_5_pin_1.00u	SW1
1	C2803348 F1	cherry_mx_5_pin_1.00u	SW2
1	C2803348 F2	cherry_mx_5_pin_1.00u	SW3
1	C2803348 F3	cherry_mx_5_pin_1.00u	SW4
1	C2803348 F4	cherry_mx_5_pin_1.00u	SW5
1	C2803348 F5	cherry_mx_5_pin_1.00u	SW6
1	C2803348 F6	cherry_mx_5_pin_1.00u	SW7
1	C2803348 F7	cherry_mx_5_pin_1.00u	SW8
1	C2803348 F8	cherry_mx_5_pin_1.00u	SW9
1	C2803348 F9	cherry_mx_5_pin_1.00u	SW10
1	F10	cherry_mx_5_pin_1.00u	SW11
1	F11	cherry_mx_5_pin_1.00u	SW12
1	F12	cherry_mx_5_pin_1.00u	SW13
1	C2803348 TILDE	cherry_mx_5_pin_1.00u	SW14
1	1	cherry_mx_5_pin_1.00u	SW15
1	2	cherry_mx_5_pin_1.00u	SW16
1	3	cherry_mx_5_pin_1.00u	SW17
1	4	cherry_mx_5_pin_1.00u	SW18
1	5	cherry_mx_5_pin_1.00u	SW19
1	6	cherry_mx_5_pin_1.00u	SW20
1	7	cherry_mx_5_pin_1.00u	SW21
1	8	cherry_mx_5_pin_1.00u	SW22
1	9	cherry_mx_5_pin_1.00u	SW23
1	0	cherry_mx_5_pin_1.00u	SW24
1	C2803348 -	cherry_mx_5_pin_1.00u	SW25
1	C2803348 =	cherry_mx_5_pin_1.00u	SW26
1	C2803348 BACKSPACE	cherry_mx_5_pin_2.00u	SW27
1	C2803348 TAB	cherry_mx_5_pin_1.50u	SW28
1	C2803348 Q	cherry_mx_5_pin_1.00u	SW29
1	C2803348 W	cherry_mx_5_pin_1.00u	SW30
1	C2803348 E	cherry_mx_5_pin_1.00u	SW31
1	C2803348 R	cherry_mx_5_pin_1.00u	SW32
1	C2803348 T	cherry_mx_5_pin_1.00u	SW33
1	C2803348 Y	cherry_mx_5_pin_1.00u	SW34
1	C2803348 U	cherry_mx_5_pin_1.00u	SW35
1	C2803348 I	cherry_mx_5_pin_1.00u	SW36
1	C2803348 O	cherry_mx_5_pin_1.00u	SW37
1	C2803348 P	cherry_mx_5_pin_1.00u	SW38
1	C2803348 [	cherry_mx_5_pin_1.00u	SW39
1	C2803348 ]	cherry_mx_5_pin_1.00u	SW40
1	C2803348 \	cherry_mx_5_pin_1.50u	SW41
1	C2803348 CAPS	cherry_mx_5_pin_1.75u	SW42
1	C2803348 A	cherry_mx_5_pin_1.00u	SW43
1	C2803348 S	cherry_mx_5_pin_1.00u	SW44
1	C2803348 D	cherry_mx_5_pin_1.00u	SW45
1	C2803348 F	cherry_mx_5_pin_1.00u	SW46
1	C2803348 G	cherry_mx_5_pin_1.00u	SW47
1	C2803348 H	cherry_mx_5_pin_1.00u	SW48
1	C2803348 J	cherry_mx_5_pin_1.00u	SW49
1	C2803348 K	cherry_mx_5_pin_1.00u	SW50
1	C2803348 L	cherry_mx_5_pin_1.00u	SW51
1	C2803348 ;	cherry_mx_5_pin_1.00u	SW52
1	C2803348 '	cherry_mx_5_pin_1.00u	SW53
1	C2803348 ENTER	cherry_mx_5_pin_2.25u	SW54
1	C2803348 L_SHIFT	cherry_mx_5_pin_2.25u	SW55
1	C2803348 Z	cherry_mx_5_pin_1.00u	SW56
1	C2803348 X	cherry_mx_5_pin_1.00u	SW57
1	C2803348 C	cherry_mx_5_pin_1.00u	SW58
1	C2803348 V	cherry_mx_5_pin_1.00u	SW59
1	C2803348 B	cherry_mx_5_pin_1.00u	SW60
1	C2803348 N	cherry_mx_5_pin_1.00u	SW61
1	C2803348 M	cherry_mx_5_pin_1.00u	SW62
1	C2803348 ,	cherry_mx_5_pin_1.00u	SW63
1	C2803348 .	cherry_mx_5_pin_1.00u	SW64
1	C2803348 /	cherry_mx_5_pin_1.00u	SW65
1	C2803348 UP	cherry_mx_5_pin_1.00u	SW66
1	C2803348 FN	cherry_mx_5_pin_1.00u	SW67
1	C2803348 BL_CTRL	cherry_mx_5_pin_1.00u	SW68
1	C2803348 L_ALT	cherry_mx_5_pin_1.00u	SW69
1	C2803348 L_CMD	cherry_mx_5_pin_1.25u	SW70
1	C2803348 SPACE	cherry_mx_5_pin_6.25u	SW71
1	C2803348 R_CMD	cherry_mx_5_pin_1.25u	SW72
1	C2803348 LEFT	cherry_mx_5_pin_1.00u	SW73
1	C2803348 DOWN	cherry_mx_5_pin_1.00u	SW74
1	C2803348 RIGHT	cherry_mx_5_pin_1.00u	SW75
75	C81598 D_Small	D_SOD-123	D1, D2, D3, D4, D5, D6, D7, D8 +67
1	C8598 5819W	D_SOD-123	D76
1	C2297 Power LED (Blue)	LED_0805_2012Metric	D77
1	5819W	D_SOD-123	D78
1	C1015 100@100MHz	L_0805_2012Metric	FB1
2	1UF 2.2uF	C_0603_1608Metric	C1, C2
3	100nF	C_0402_1005Metric	C3, C18, C20
2	1UF 1uF	C_0402_1005Metric	C4, C5
2	30PF 30pF	C_0603_1608Metric	C6, C7
10	100NF 100nF	C_0402_1005Metric	C8, C9, C10, C11, C12, C13, C14, C15 +2
1	2.2uF	C_0603_1608Metric	C19
2	C25190 27 ohm	R_0603_1608Metric	R1, R2
2	C11702 1k ohm	R_0603_1608Metric	R3, R5
2	C25744 10k ohm	R_0603_1608Metric	R4, R8
2	5.1K 5.1k	R_0603_1608Metric	R6, R7
1	C25867 1k ohm	R_0603_1608Metric	R9

Key ripper design files

The KiCad project lives in the bschwind/key-ripper repository on GitHub; these links point at the commit this page was built from.

Key ripper: common questions

What microcontroller does the Key ripper use?

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

How big is the Key ripper PCB?

The Key ripper measures 285.8 × 116.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Key ripper?

211 components, from 114 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 Key ripper design files?

From the bschwind/key-ripper 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 Key ripper design in my own project?

Yes, under the terms of its Apache-2.0 license, which bschwind chose for the repository.

Can I test firmware for the Key ripper 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.