HardLabs

X-2: Lumberjack-Arm

rgoulter·keyboard-labs·pcb/keyboard-x2-lumberjack-arm.kicad_pcb

X-2: Lumberjack-Arm PCB layout, top view — open source STM32 board by rgoulter
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About the X-2: Lumberjack-Arm PCB

X-2: Lumberjack-Arm is an open source STM32 PCB design by rgoulter, published on GitHub. It is a 2-layer board measuring 285 × 94.2 mm, with 137 components from 12 distinct parts.

Its main chip is the DIP-40_W15.24mm_Socket, from the STM32 family. Other key parts include the SN74LVC1T45DBV. By type, the board carries 60 LEDs, 5 diodes, 4 capacitors, 4 resistors, 2 ICs and 1 connector.

It belongs with the keyboards designs in this gallery.

From the project

Repo with my PCB designs and keyboard firmware

This repository contains the source files for keyboard designs and keyboard firmware.

Plotted gerber files can be found under the GitHub repository's releases.

Assembled PCBs for selected designs are available on the RGoulter's Keyboard Labs store.

- PCB smaller than 100x100 mm2, so that it's cheaper to fabricate at various PCB fabricators. - Reversible PCB (use the same PCB for left/right halves). - Using the WeAct Studio MiniF4 "black pill" dev board, a cheap STM32F4 dev board that runs ARM. - Low profile (PCB + choc switches + bumpons). - Column-staggered arrangement of key switches. -…

X-2: Lumberjack-Arm, from the project README
From the project README

Main components on the X-2: Lumberjack-Arm

SN74LVC1T45DBV

X-2: Lumberjack-Arm bill of materials (BOM)

137 components, 12 distinct parts.

QtyPartRefs
1
STM32F103 Bluepill, or MiniF4 STM32F4x1 "Blackpill"
U1
1
SN74LVC1T45DBV
U2
1
16-pin USB-C Connector SMD
J1
60
1N4148
D_1_1, D_1_2, D_1_3, D_1_4, D_1_5, D_1_6, D_1_7, D_1_8 +52
1
~
H7
60
MX-compatible or Kailh Choc v1
SW_1_1, SW_1_2, SW_1_3, SW_1_4, SW_1_5, SW_1_6, SW_1_7, SW_1_8 +52
4
SK6812
D1, D2, D3, D4
1
1N4148
D5
4
100nF
C1, C2, C3, C4
2
5.1k
R1, R2
1
2.2k - 10k
R3
1
300 - 500R
R4

X-2: Lumberjack-Arm design files

The KiCad project lives in the rgoulter/keyboard-labs repository on GitHub; these links point at the commit this page was built from.

X-2: Lumberjack-Arm: common questions

What microcontroller does the X-2: Lumberjack-Arm use?

The X-2: Lumberjack-Arm is built around the DIP-40_W15.24mm_Socket, from the STM32 family.

How big is the X-2: Lumberjack-Arm PCB?

The X-2: Lumberjack-Arm measures 285 × 94.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the X-2: Lumberjack-Arm?

137 components, from 12 distinct parts. The full bill of materials is listed on this page.

Where can I download the X-2: Lumberjack-Arm design files?

From the rgoulter/keyboard-labs repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the X-2: Lumberjack-Arm design in my own project?

The repository has no license, so all rights stay with rgoulter. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the X-2: Lumberjack-Arm 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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