620f48035c
The org was renamed from incutec-hw to OpenDrone-hw. Old links only work through GitHub's rename redirect, which stops working as soon as the incutec-hw name is registered again for the company org. Docs and submodule URLs only. No design files touched. Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
OpenFC-Lite-Mini
Open-source Betaflight flight controller with a 20 x 20 mm mounting pattern, part of the incutec OpenDrone line. Designed in KiCad 10 for JLCPCB assembly. Its sibling OpenFC-Lite (30.5 x 30.5 mm, RP2354B: bigger pads, more I/O, OSD debug pads) shares this design. Specifications are below; full design detail is in hardware/docs/DESIGN.md.
Status
Hardware validated, Rev2, 2026-08-05.
Latest production export set is OpenFC-Lite-Mini-rev2 (2026-06-04), generated with the KiCad Fabrication Toolkit for JLCPCB assembly.
Certification
OpenFC-Lite-Mini is certified open source hardware by the Open Source Hardware Association, OSHWA UID BE000027.
Build video: How Flight Controllers Work (so I built my own)
Links
- Product page: opendrone.be/products/openfc-lite
- Video channel: JustFPV on YouTube
Specifications
| Parameter | Value |
|---|---|
| MCU | RP2354A, dual Cortex-M33 @ 150 MHz, 2 MB stacked flash, QFN-60, 30 GPIO |
| IMU | 6-axis on SPI1, LGA-14 footprint (ST and TDK compatible), LSM6DSV16XTR populated |
| Blackbox | microSD card slot (TF-021B-H265) on SPI0 |
| OSD | Analog, PIO-driven: sync separator + video op-amp + SPDT switch |
| RX | External, over UART |
| Power | 3S-6S input, switchable 10V VTX rail + always-on 5V, reverse-polarity protected |
| USB | USB-C, USB-CDC for configuration |
| Firmware | Betaflight, custom target OPENFC_LITE_MINI_RP2350A |
| PCB | 6-layer, 20 x 20 mm mounting pattern |
Part-level detail (power tree, GPIO map, OSD front end, PIO allocation, firmware target) is in hardware/docs/DESIGN.md.
Repository layout
| Path | Contents |
|---|---|
hardware/ |
KiCad 10 project: schematics, PCB, project-local libraries |
hardware/docs/ |
Design documentation (DESIGN.md) |
hardware/research/ |
IMU selection, open items |
hardware/tools/ |
Analysis scripts (Python, kicad-skip / pcbnew API) |
hardware/production/ |
Fabrication exports per revision (generated, gitignored) |
libs/KiCad-Library |
Shared Incutec symbol/footprint/3D library (git submodule) |
images/ |
Board renders and certification marks |
Design entry points
- Top schematic:
hardware/OpenFC.kicad_sch(hierarchical) - Sub-sheets:
rp2350a.kicad_sch(MCU, crystal, USB-C),power.kicad_sch,imu.kicad_sch,osd.kicad_sch,blackbox.kicad_sch,pads.kicad_sch - Board layout:
hardware/OpenFC.kicad_pcb, 6 copper layers
The project-local libraries are hardware/lib.kicad_sym, hardware/lib.pretty/, and hardware/lib.3dshapes/; the project lib tables also reference the shared Incutec library from the libs/KiCad-Library submodule, used for new parts.
Build and export
git clone --recursive https://github.com/OpenDrone-hw/OpenFC-Lite-Mini.git
Open hardware/OpenFC.kicad_pro in KiCad 10. Production exports (gerbers, BOM, CPL) are generated with the KiCad Fabrication Toolkit plugin. Headless checks and exports use kicad-cli:
kicad-cli sch erc --exit-code-violations hardware/OpenFC.kicad_sch
kicad-cli pcb drc --exit-code-violations hardware/OpenFC.kicad_pcb
kicad-cli pcb export gerbers -o out/ hardware/OpenFC.kicad_pcb
Manufacturing
Fabricated and assembled at JLCPCB: 6-layer board, LCSC parts. Per-revision BOM, CPL, and gerber sets are generated into hardware/production/ (gitignored) with the Fabrication Toolkit, using the tracked hardware/fabrication-toolkit-options.json.
Contributing
See CONTRIBUTING.md.
License
Hardware licensed under CERN-OHL-S-2.0. See LICENSE.