Detach75-keyboard
About the Detach75-keyboard PCB
Detach75-keyboard is an open source AVR/Arduino PCB design by seakrueger, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 319.9 × 131 mm, with 188 components from 98 distinct parts.
Its main chip is the ATMEGA32U4-A, from the AVR/Arduino family. Other key parts include the SL2.1A and C115351. By type, the board carries 81 diodes, 80 relays, 13 capacitors, 6 resistors, 3 ICs and 3 connectors.
It belongs with the keyboards designs in this gallery.
From the project
A basic 75% mechanical keyboard
To flash the PCB's MCU, first set up QMK following their guide here. Then, copy the contents of the Firmware directory into the QMK keyboard directory. Compile the firmware with qmk compile -kb detach/75 -km default and flash using QMK's flashing guide. Use the reset push button on the underside of the PCB to initiate the ATmega bootloader; the MCU can be flashed via the USB-C port.
Main components on the Detach75-keyboard
Detach75-keyboard bill of materials (BOM)
188 components, 98 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATMEGA32U4-A ATmega32U4-A | TQFP-44_10x10mm_P0.8mm | U1 |
| 1 | SL2.1A | SO16 | U2 |
| 1 | C115351 ~ | SW_SPST_SKQG_WithStem | U3 |
| 1 | CRYSTAL_GND24_SMALL Crystal_GND24_Small | Crystal_SMD_3225-4Pin_3.2x2.5mm_HandSoldering | Y1 |
| 1 | USB_C_RECEPTACLE_USB2.0_14P USB_C_Receptacle_USB2.0_14P | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | AVR-ISP-6 | Reset_Pretty-Mask | J2 |
| 1 | CONN_01X04 Conn_01x04 | JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J3 |
| 1 | 500M 500m | Fuse_1206_3216Metric_Pad1.42x1.75mm_HandSolder | F1 |
| 1 | ESC | SW_Hotswap_Kailh_MX_1.00u | K000 |
| 1 | F1 | SW_Hotswap_Kailh_MX_1.00u | K002 |
| 1 | F2 | SW_Hotswap_Kailh_MX_1.00u | K003 |
| 1 | F3 | SW_Hotswap_Kailh_MX_1.00u | K004 |
| 1 | F4 | SW_Hotswap_Kailh_MX_1.00u | K005 |
| 1 | F5 | SW_Hotswap_Kailh_MX_1.00u | K006 |
| 1 | F6 | SW_Hotswap_Kailh_MX_1.00u | K007 |
| 1 | F7 | SW_Hotswap_Kailh_MX_1.00u | K008 |
| 1 | F8 | SW_Hotswap_Kailh_MX_1.00u | K009 |
| 1 | F9 | SW_Hotswap_Kailh_MX_1.00u | K010 |
| 1 | F10 | SW_Hotswap_Kailh_MX_1.00u | K011 |
| 1 | F11 | SW_Hotswap_Kailh_MX_1.00u | K012 |
Show 78 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | F12 | SW_Hotswap_Kailh_MX_1.00u | K013 |
| 1 | F13 | SW_Hotswap_Kailh_MX_1.00u | K014 |
| 1 | ~ | SW_Hotswap_Kailh_MX_1.00u | K100 |
| 1 | 1 | SW_Hotswap_Kailh_MX_1.00u | K101 |
| 1 | 2 | SW_Hotswap_Kailh_MX_1.00u | K102 |
| 1 | 3 | SW_Hotswap_Kailh_MX_1.00u | K103 |
| 1 | 4 | SW_Hotswap_Kailh_MX_1.00u | K104 |
| 1 | 5 | SW_Hotswap_Kailh_MX_1.00u | K105 |
| 1 | 6 | SW_Hotswap_Kailh_MX_1.00u | K106 |
| 1 | 7 | SW_Hotswap_Kailh_MX_1.00u | K107 |
| 1 | 8 | SW_Hotswap_Kailh_MX_1.00u | K108 |
| 1 | 9 | SW_Hotswap_Kailh_MX_1.00u | K109 |
| 1 | 0 | SW_Hotswap_Kailh_MX_1.00u | K110 |
| 1 | - | SW_Hotswap_Kailh_MX_1.00u | K111 |
| 1 | = | SW_Hotswap_Kailh_MX_1.00u | K112 |
| 1 | Backspace | SW_Hotswap_Kailh_MX_2.00u | K113 |
| 1 | Insert | SW_Hotswap_Kailh_MX_1.00u | K114 |
| 1 | Tab | SW_Hotswap_Kailh_MX_1.50u | K200 |
| 1 | Q | SW_Hotswap_Kailh_MX_1.00u | K201 |
| 1 | W | SW_Hotswap_Kailh_MX_1.00u | K202 |
| 1 | E | SW_Hotswap_Kailh_MX_1.00u | K203 |
| 1 | R | SW_Hotswap_Kailh_MX_1.00u | K204 |
| 1 | T | SW_Hotswap_Kailh_MX_1.00u | K205 |
| 1 | Y | SW_Hotswap_Kailh_MX_1.00u | K206 |
| 1 | U | SW_Hotswap_Kailh_MX_1.00u | K207 |
| 1 | I | SW_Hotswap_Kailh_MX_1.00u | K208 |
| 1 | O | SW_Hotswap_Kailh_MX_1.00u | K209 |
| 1 | P | SW_Hotswap_Kailh_MX_1.00u | K210 |
| 1 | [ | SW_Hotswap_Kailh_MX_1.00u | K211 |
| 1 | ] | SW_Hotswap_Kailh_MX_1.00u | K212 |
| 1 | \ | SW_Hotswap_Kailh_MX_1.50u | K213 |
| 1 | Delete | SW_Hotswap_Kailh_MX_1.00u | K214 |
| 1 | Caps Lock | SW_Hotswap_Kailh_MX_1.75u | K300 |
| 1 | A | SW_Hotswap_Kailh_MX_1.00u | K301 |
| 1 | S | SW_Hotswap_Kailh_MX_1.00u | K302 |
| 1 | D | SW_Hotswap_Kailh_MX_1.00u | K303 |
| 1 | F | SW_Hotswap_Kailh_MX_1.00u | K304 |
| 1 | G | SW_Hotswap_Kailh_MX_1.00u | K305 |
| 1 | H | SW_Hotswap_Kailh_MX_1.00u | K306 |
| 1 | J | SW_Hotswap_Kailh_MX_1.00u | K307 |
| 1 | K | SW_Hotswap_Kailh_MX_1.00u | K308 |
| 1 | L | SW_Hotswap_Kailh_MX_1.00u | K309 |
| 1 | ; | SW_Hotswap_Kailh_MX_1.00u | K310 |
| 1 | ' | SW_Hotswap_Kailh_MX_1.00u | K311 |
| 1 | Enter | SW_Hotswap_Kailh_MX_2.25u | K312 |
| 1 | Left Shift | SW_Hotswap_Kailh_MX_2.25u | K400 |
| 1 | Z | SW_Hotswap_Kailh_MX_1.00u | K401 |
| 1 | X | SW_Hotswap_Kailh_MX_1.00u | K402 |
| 1 | C | SW_Hotswap_Kailh_MX_1.00u | K403 |
| 1 | V | SW_Hotswap_Kailh_MX_1.00u | K404 |
| 1 | B | SW_Hotswap_Kailh_MX_1.00u | K405 |
| 1 | N | SW_Hotswap_Kailh_MX_1.00u | K406 |
| 1 | M | SW_Hotswap_Kailh_MX_1.00u | K407 |
| 1 | , | SW_Hotswap_Kailh_MX_1.00u | K408 |
| 1 | . | SW_Hotswap_Kailh_MX_1.00u | K409 |
| 1 | / | SW_Hotswap_Kailh_MX_1.00u | K410 |
| 1 | Right Shift | SW_Hotswap_Kailh_MX_1.75u | K411 |
| 1 | Up Arrow | SW_Hotswap_Kailh_MX_1.00u | K413 |
| 1 | Left Ctrl | SW_Hotswap_Kailh_MX_1.25u | K500 |
| 1 | Windows | SW_Hotswap_Kailh_MX_1.25u | K501 |
| 1 | Left Alt | SW_Hotswap_Kailh_MX_1.25u | K502 |
| 1 | Space | SW_Hotswap_Kailh_MX_6.25u | K505 |
| 1 | Right Alt | SW_Hotswap_Kailh_MX_1.00u | K509 |
| 1 | Fn | SW_Hotswap_Kailh_MX_1.00u | K510 |
| 1 | Right Ctrl | SW_Hotswap_Kailh_MX_1.00u | K511 |
| 1 | Left Arrow | SW_Hotswap_Kailh_MX_1.00u | K512 |
| 1 | Down Arrow | SW_Hotswap_Kailh_MX_1.00u | K513 |
| 1 | Right Arrow | SW_Hotswap_Kailh_MX_1.00u | K514 |
| 80 | C77978 D | D_SOD-123 | D1, D2, D3, D4, D5, D7, D8, D9 +72 |
| 1 | PRTR5V0U2X | SOT-143 | D6 |
| 4 | 10UF 10uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C7 |
| 2 | 22PF 22pF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4, C5 |
| 1 | 1UF 1uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C6 |
| 5 | 100NF 100nF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C8, C9, C10, C11, C12 |
| 1 | 100UF 100uF | C_Elec_6.3x5.4 | C14 |
| 2 | 5.1K 5.1k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2 |
| 2 | 22 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R4 |
| 2 | 10K 10k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R6 |
Detach75-keyboard design files
The KiCad project lives in the seakrueger/detach75-keyboard repository on GitHub; these links point at the commit this page was built from.
Detach75-keyboard: common questions
What microcontroller does the Detach75-keyboard use?
The Detach75-keyboard is built around the ATMEGA32U4-A, from the AVR/Arduino family.
How big is the Detach75-keyboard PCB?
The Detach75-keyboard measures 319.9 × 131 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Detach75-keyboard?
188 components, from 98 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 Detach75-keyboard design files?
From the seakrueger/detach75-keyboard 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 Detach75-keyboard design in my own project?
Yes, under the terms of its Apache-2.0 license, which seakrueger chose for the repository.
Can I test firmware for the Detach75-keyboard without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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