2 layers428.6 × 121.4 mm
A2000Serotina
grahamshaw1972/a2000Serotina
The A2000 Serotina Keyboard is a build it yourself Open Source Hardware Mechanical Keyboard for the Amiga A2000 and A3000 computers. Features are:
234 parts39GPL-3.0
2 layers248 × 99.3 mm
FN40HE
Mokeded/FN40HEFN40HE is a 40%, Hall-effect mechanical keyboard PCB and firmware project. It adapts the FN40 layout to magnetic (Hall-effect) switches, giving every key analog actuation — per-key adjustable actuation points, Rapid…
- Size
- 248 × 99.3 mm
- Copper layers
- 2
- Thickness
- 1.2 mm
- Parts
- 234
- Nets
- 122
- Pads
- 862
- Tracks, vias
- 1,228, 266
- Pours
- 66
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 2 Sep 2026
- Updated
- 3 Sep 2026
Overview
FN40HE is an open-source printed circuit board by Mokeded, from the Mokeded/FN40HE repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 248 × 99.3 mm with 234 parts on 122 nets, routed with 1,228 tracks and 266 vias.
Its parts include 77 capacitors and 2 resistors.
README
README.mdFN40HE
FN40HE is a 40%, Hall-effect mechanical keyboard PCB and firmware project. It adapts the FN40 layout to magnetic (Hall-effect) switches, giving every key analog actuation — per-key adjustable actuation points, Rapid Trigger, SOCD/Null Bind, Dynamic Keystroke, and analog gamepad output — instead of a fixed mechanical trip point.
What's in this repository
- KiCad hardware design —
FN40HE.kicad_pro/.kicad_sch/.kicad_pcb, a two-layer PCB with 57 independent Hall-sensor channels multiplexed down to an 8-channel ADC scan order, plusFN40HE-plate.stepfor the mechanical plate reference.FN40_Project.pretty,lib,fp-lib-table, andsym-lib-tableare the local footprint/symbol libraries needed to open the project without external dependencies. - Firmware (
firmware/) — a libhmk-derived build configured for thefn40heboard target, with prebuilt DFU artifacts infirmware/build/and full source underfirmware/source/for rebuilding. - Manufacturing and assembly data —
FN40HE-BOM.csv(bill of materials for all assembly variants),FN40HE-ASSEMBLY.md(which mutually-exclusive switch/sensor positions to populate per variant),FN40HE-sensor-map.csvandFN40HE-mux-map.csv(physical-to-firmware key mapping), andmanufacturing/FN40HE-Gerbers-JLCPCB.zip(bare-board fab archive). - Verification records —
FN40HE-DRC.rptandFN40HE-ERC.rpt(PCB/ schematic check reports) andFN40HE-J1-WAIVER.md(documented DRC waiver and inspection requirement for the J1 connector footprint).
See FN40HE-README.md for release status, build/flash instructions, and
firmware feature details.
Assembly variants
The board supports three populate/DNP variants sharing one PCB:
Universal57 (all 57 sensors populated — the released default),
SplitSpace, and SevenUnit (alternate bottom-row layouts). See
FN40HE-ASSEMBLY.md and the DNP columns in FN40HE-BOM.csv before
ordering assembly.
License
This project incorporates GPLv3-derived hardware design and firmware work.
See LICENSE. Retain source, license, and attribution when redistributing
modifications.
Parts
234| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | M2_PLATE_STANDOFF | FN40_Project:MountingHole_2.2mm_M2_Pad | MH1, MH2, MH3, MH4, MH5, MH6, MH7, MH8 |
| 1 | 100n | FN40_Project:C65_C_0402_1005Metric | C65 |
| 1 | 100n | FN40_Project:C71_C_0402_1005Metric | C71 |
| 1 | 100n | FN40_Project:C93_C_0402_1005Metric | C93 |
| 1 | 100n | FN40_Project:C142_C_0402_1005Metric | C142 |
| 1 | 100n | FN40_Project:C81_C_0402_1005Metric | C81 |
| 1 | 100n | FN40_Project:C69_C_0402_1005Metric | C69 |
| 1 | 100n | FN40_Project:C156_C_0402_1005Metric | C156 |
| 1 | 100n | FN40_Project:C143_C_0402_1005Metric | C143 |
| 1 | 100n | FN40_Project:C17_C_0402_1005Metric | C17 |
| 1 | 100n | FN40_Project:C158_C_0402_1005Metric | C158 |
| 1 | 100n | FN40_Project:C83_C_0402_1005Metric | C83 |
| 1 | 100n | FN40_Project:C109_C_0402_1005Metric | C109 |
| 1 | 100n | FN40_Project:C23_C_0402_1005Metric | C23 |
| 1 | 100n | FN40_Project:C79_C_0402_1005Metric | C79 |
| 1 | 100n | FN40_Project:C49_C_0402_1005Metric | C49 |
| 1 | 100n | FN40_Project:C53_C_0402_1005Metric | C53 |
| 1 | 100n | FN40_Project:C63_C_0402_1005Metric | C63 |
| 1 | 100n | FN40_Project:C95_C_0402_1005Metric | C95 |
| 1 | 100n | FN40_Project:C107_C_0402_1005Metric | C107 |
| 1 | 100n | FN40_Project:C87_C_0402_1005Metric | C87 |
| 1 | 100n | FN40_Project:C97_C_0402_1005Metric | C97 |
| 1 | 100n | FN40_Project:C1_C_0402_1005Metric | C1 |
| 1 | 100n | FN40_Project:C73_C_0402_1005Metric | C73 |
| 1 | 100n | FN40_Project:C111_C_0402_1005Metric | C111 |
| 1 | 100n | FN40_Project:C25_C_0402_1005Metric | C25 |
| 1 | 100n | FN40_Project:C141_C_0402_1005Metric | C141 |
| 1 | 100n | FN40_Project:C55_C_0402_1005Metric | C55 |
| 1 | 100n | FN40_Project:C57_C_0402_1005Metric | C57 |
| 1 | 100n | FN40_Project:C61_C_0402_1005Metric | C61 |
| 1 | 100n | FN40_Project:C113_C_0402_1005Metric | C113 |
| 1 | 100n | FN40_Project:C41_C_0402_1005Metric | C41 |
| 1 | 100n | FN40_Project:C33_C_0402_1005Metric | C33 |
| 1 | 100n | FN40_Project:C77_C_0402_1005Metric | C77 |
| 1 | 100n | FN40_Project:C101_C_0402_1005Metric | C101 |
| 1 | 100n | FN40_Project:C85_C_0402_1005Metric | C85 |
| 1 | 100n | FN40_Project:C21_C_0402_1005Metric | C21 |
| 1 | 100n | FN40_Project:C103_C_0402_1005Metric | C103 |
| 1 | 100n | FN40_Project:C145_C_0402_1005Metric | C145 |
| 1 | 100n | FN40_Project:C47_C_0402_1005Metric | C47 |
| 1 | 100n | FN40_Project:C75_C_0402_1005Metric | C75 |
| 1 | 100n | FN40_Project:C43_C_0402_1005Metric | C43 |
| 1 | 100n | FN40_Project:C67_C_0402_1005Metric | C67 |
| 1 | 100n | FN40_Project:C155_C_0402_1005Metric | C155 |
| 1 | 100n | FN40_Project:C51_C_0402_1005Metric | C51 |
| 1 | 100n | FN40_Project:C89_C_0402_1005Metric | C89 |
| 1 | 100n | FN40_Project:C91_C_0402_1005Metric | C91 |
| 1 | 100n | FN40_Project:C35_C_0402_1005Metric | C35 |
| 1 | 100n | FN40_Project:C45_C_0402_1005Metric | C45 |
| 1 | 100n | FN40_Project:C160_C_0402_1005Metric | C160 |
| 1 | 100n | FN40_Project:C37_C_0402_1005Metric | C37 |
| 1 | 100n | FN40_Project:C31_C_0402_1005Metric | C31 |
| 1 | 100n | FN40_Project:C29_C_0402_1005Metric | C29 |
| 1 | 100n | FN40_Project:C13_C_0402_1005Metric | C13 |
| 1 | 100n | FN40_Project:C146_C_0402_1005Metric | C146 |
| 1 | 100n | FN40_Project:C7_C_0402_1005Metric | C7 |
| 1 | 100n | FN40_Project:C39_C_0402_1005Metric | C39 |
| 1 | 100n | FN40_Project:C9_C_0402_1005Metric | C9 |
| 1 | 100n | FN40_Project:C19_C_0402_1005Metric | C19 |
| 1 | 100n | FN40_Project:C15_C_0402_1005Metric | C15 |
| 1 | 100n | FN40_Project:C3_C_0402_1005Metric | C3 |
| 1 | 100n | FN40_Project:C105_C_0402_1005Metric | C105 |
| 1 | 100n | FN40_Project:C140_C_0402_1005Metric | C140 |
| 1 | 100n | FN40_Project:C11_C_0402_1005Metric | C11 |
| 1 | 100n | FN40_Project:C59_C_0402_1005Metric | C59 |
| 1 | 100n | FN40_Project:C5_C_0402_1005Metric | C5 |
| 1 | 100n | FN40_Project:C144_C_0402_1005Metric | C144 |
| 1 | 100n | FN40_Project:C139_C_0402_1005Metric | C139 |
| 1 | 100n | FN40_Project:C154_C_0402_1005Metric | C154 |
| 1 | 100n | FN40_Project:C99_C_0402_1005Metric | C99 |
| 1 | 100n | FN40_Project:C27_C_0402_1005Metric | C27 |
| 1 | 10u | FN40_Project:C157_C_0603_1608Metric | C157 |
| 1 | 12k | FN40_Project:R4_R_0402_1005Metric | R4 |
| 1 | 12k | FN40_Project:R3_R_0402_1005Metric | R3 |
| 1 | 1u | FN40_Project:C159_C_0603_1608Metric | C159 |
| 1 | 2.2u | FN40_Project:C148_C_0603_1608Metric | C148 |
| 1 | 2.2u | FN40_Project:C149_C_0603_1608Metric | C149 |
| 1 | 2.2u | FN40_Project:C150_C_0603_1608Metric | C150 |
| 1 | 2.2u | FN40_Project:C151_C_0603_1608Metric | C151 |
| 1 | 30p | FN40_Project:C153_C_0603_1608Metric | C153 |
The 87 most common of 234 parts.
Questions
How big is the FN40HE PCB?
It measures 248 × 99.3 mm and has 2 copper layers, 1.2 mm thick.
What parts does the FN40HE use?
234 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the FN40HE KiCad files?
From the Mokeded/FN40HE repository on GitHub, at the commit this page was made from: the board is FN40HE.kicad_pcb and its schematic FN40HE.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the FN40HE design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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