HardLabs

FN40

Mokeded·FN40-PCB

FN40 PCB layout, top view — open source STM32 board by Mokeded

About the FN40 PCB

FN40 is an open source STM32 PCB design by Mokeded, published on GitHub. It is a 2-layer board measuring 248 × 99.3 mm, with 137 components from 19 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 67 switches, 57 diodes, 9 capacitors, 2 ICs, 1 connector and 1 resistor.

It belongs with the keyboards designs in this gallery.

From the project

KiCad PCB design for the FN40, a hotswap 40%-style mechanical keyboard (internal project name 4060).

KiCad PCB design for the FN40, a hotswap 40%-style mechanical keyboard (internal project name 4060).

- 4060.kicadpro / 4060.kicadsch / 4060.kicadpcb — KiCad project, schematic, and board files - 4060.kicadprl — KiCad project local settings - 4060.json — layout/keyboard-layout-editor data - 4060.svg — rendered board image - 4060.round-tracks-config — config for the KiCad round-tracks plugin - 4060-backups/ — autosaved backups of the board file - footprints/SwitchKeyboardHotswapKailh.pretty/ — Kailh hotswap socket footprint library - acheronComponents.pretty-master/…

Main components on the FN40

STM32F072C8TXXC6206PXXXMR-REGULATOR_LINEAR

FN40 bill of materials (BOM)

137 components, 19 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
45
SW_Push
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +37
6
SW_Push
SW12, SW23, SW48, SW49, SW56, SW57
1
SW_Push
SW24
1
SW_Push
SW24_1
4
SW_Push
SW35, SW36, SW48_1, SW57_1
1
SW_Push
SW35_1
3
SW_Push
SW35_2, SW36_1, SW54
1
SW_Push
SW47
2
SW_Push
SW47_1, SW52
1
SW_Push
SW53
2
C318884
RST
SW58, SW59
57
D
D1, D2, D3, D4, D5, D6, D7, D8 +49
6
100NF
100nF
C1, C3, C4, C5, C6, C7
1
4.7UF
4.7uF
C2
2
1UF
1uF
C8, C9
1
10K
10k
R1

FN40 design files

The KiCad project lives in the Mokeded/FN40-PCB repository on GitHub; these links point at the commit this page was built from.

FN40: common questions

What microcontroller does the FN40 use?

The FN40 is built around the STM32F072C8TX, from the STM32 family.

How big is the FN40 PCB?

The FN40 measures 248 × 99.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the FN40?

137 components, from 19 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 FN40 design files?

From the Mokeded/FN40-PCB 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 FN40 design in my own project?

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

Can I test firmware for the FN40 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.

Similar boards