HardLabs

5x5

dijkstrw·5x5·schematic/5x5.kicad_pcb

5x5 PCB layout, top view — open source STM32 board by dijkstrw

About the 5x5 PCB

5x5 is an open source STM32 PCB design by dijkstrw, published on GitHub under the BSD-3-Clause license. It is a 2-layer board measuring 100 × 100 mm, with 85 components from 24 distinct parts.

Its main chip is the STM32F103C8, from the STM32 family. Other key parts include the MAX3207E and LD1117S33CTR. By type, the board carries 28 diodes, 25 switches, 13 capacitors, 11 resistors, 3 ICs and 3 connectors.

It belongs with the keyboards designs in this gallery.

From the project

A custom 5x5 keyboard

This is my first custom keyboard, a 5x5 cherry mx matrix based on the STM32F1 with libopencm3. The project contains firmware, schematics and a board layout in kicad.

This project is intended as a platform for custom keyboard development. It supports: - usb keyboard scancodes - bios boot and nkro - system / consumer codes - generation of mouse events - usb serial interface - an automouse mode for fast-clicking - programmable macro keys via serial - storing current configuration in "userflash"

5x5, from the project README
From the project README

Main components on the 5x5

MAX3207ESTM32F103C8LD1117S33CTR

5x5 bill of materials (BOM)

85 components, 24 distinct parts.

QtyPartRefs
1
MAX3207E
U1
1
STM32F103C8
U2
1
LD1117S33CTR
U3
1
16M
Y1
1
USB-B
P2
1
I2CI
P5
1
I2CO
P6
25
SW
SW11, SW12, SW13, SW14, SW15, SW21, SW22, SW23 +17
3
Led_Small
D1, D2, D3
25
1N4148
D11, D12, D13, D14, D15, D21, D22, D23 +17
1
bead
L1
1
100n
C1
2
10u
C2, C12
5
100n
C3, C4, C5, C11, C13
2
1u
C6, C10
1
1n
C7
2
20p
C8, C9
1
10k
R1
1
0
R2
2
22
R3, R4
Show 4 more
QtyPartRefs
3
1k
R5, R6, R7
1
1k5
R8
1
33
R9
2
4k7
R10, R11

5x5 design files

The KiCad project lives in the dijkstrw/5x5 repository on GitHub; these links point at the commit this page was built from.

5x5: common questions

What microcontroller does the 5x5 use?

The 5x5 is built around the STM32F103C8, from the STM32 family.

How big is the 5x5 PCB?

The 5x5 measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 5x5?

85 components, from 24 distinct parts. The full bill of materials is listed on this page.

Where can I download the 5x5 design files?

From the dijkstrw/5x5 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the 5x5 design in my own project?

Yes, under the terms of its BSD-3-Clause license, which dijkstrw chose for the repository.

Can I test firmware for the 5x5 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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