HardLabs

J-XT-keyboard

Joel-Neuhaus-Khatami·J-XT-keyboard·pcb_files/xt_pcb/xt_pcb.kicad_pcb

J-XT-keyboard PCB layout, top view — open source STM32 board by Joel-Neuhaus-Khatami
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About the J-XT-keyboard PCB

J-XT-keyboard is an open source STM32 PCB design by Joel-Neuhaus-Khatami, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 400.1 × 95.3 mm, with 192 components from 20 distinct parts.

Its main chip is the STM32F072C8TX, from the STM32 family. Other key parts include the XC6206PXXXMR-REGULATOR_LINEAR. By type, the board carries 91 switches, 86 diodes, 9 capacitors, 3 resistors, 2 ICs and 1 connector.

It belongs with the keyboards designs in this gallery.

From the project

This project is to develop a full mechanical keyboard from scratch based on a modified XT layout

NOTE: The RP2040 based design is being replaced with an STM32 variety instead. The readme is thus out of date, however the case files are final New pcb and firmware will be merged soon.

This repo is for all the files used in designing and manufacturing a mechanical keyboard that I made from scratch. The keyboard itself is a modified XT layout, which was a very popular layout for 1980's keyboards.

J-XT-keyboard, from the project README
From the project README

Main components on the J-XT-keyboard

STM32F072C8TXXC6206PXXXMR-REGULATOR_LINEAR

J-XT-keyboard bill of materials (BOM)

192 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32F072C8TX
STM32F072C8Tx
U1
1
XC6206PXXXMR-REGULATOR_LINEAR
XC6206PxxxMR-Regulator_Linear
U2
1
C588524
JST
J1
2
C139779
RST
SW1, SW2
77
SW_Push
SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10 +69
2
SW_Push
SW14, SW74
1
SW_Push
SW15
4
SW_Push
SW16, SW17, SW27, SW59
1
SW_Push
SW28
1
SW_Push
SW33
1
SW_Push
SW50
1
SW_Push
SW72
1
SW_Push
SW75
86
D
D1, D2, D3, D4, D5, D6, D7, D8 +78
2
1UF
1uF
C1, C3
1
100NF
100nF
C2
1
4.7UF
4.7uF
C4
5
100NF
100nF
C5, C6, C7, C8, C9
1
10K
10k
R1
2
22Ω
R2, R3

J-XT-keyboard design files

The KiCad project lives in the Joel-Neuhaus-Khatami/J-XT-keyboard repository on GitHub; these links point at the commit this page was built from.

J-XT-keyboard: common questions

What microcontroller does the J-XT-keyboard use?

The J-XT-keyboard is built around the STM32F072C8TX, from the STM32 family.

How big is the J-XT-keyboard PCB?

The J-XT-keyboard measures 400.1 × 95.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the J-XT-keyboard?

192 components, from 20 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 J-XT-keyboard design files?

From the Joel-Neuhaus-Khatami/J-XT-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 J-XT-keyboard design in my own project?

Yes, under the terms of its GPL-3.0 license, which Joel-Neuhaus-Khatami chose for the repository.

Can I test firmware for the J-XT-keyboard without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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