6 layers26.9 × 26.9 mm
OpenFC
OpenDrone-hw/OpenFC-Lite-Mini
Open-source Betaflight flight controller. RP2354A, 20x20 mm, 6-layer, 3-6S, CERN-OHL-S-2.0.
131 parts147CERN-OHL-S-2.0
4 layers27 × 18.7 mm
Bit32F0
FaizeenHoque/Bit32F042F6Px2Minimal STM32F042F6Px breakout. USB, GPIO headers, onboard 3.3V step-down. No peripherals, no bloat. Just the chip.
- Size
- 27 × 18.7 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 29
- Pads
- 102
- Tracks, vias
- 255, 29
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 16 Mar 2026
- Updated
- 1 Apr 2026
Overview
Bit32F0 is an open-source printed circuit board by FaizeenHoque, from the FaizeenHoque/Bit32F042F6Px repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 4-layer board of 27 × 18.7 mm with 19 parts on 29 nets, routed with 255 tracks and 29 vias.
It is built around the LP5912-3.3DRVR. Its parts include 5 capacitors, 5 resistors, 4 connectors, 2 ICs and 1 diode. It belongs with the STM32 boards of this library.
Main components
1README
README.mdBit32F042F6Px
Minimal STM32F042F6Px development board. USB-C, GPIO headers, onboard 3.3V regulation. No peripherals, no bloat.
Licensed under CERN-OHL-S v2.
Features
- STM32F042F6Px (32KB Flash, 6KB RAM, 48MHz)
- USB-C (USB 2.0 Full Speed via PA11/PA12)
- LP5912-3.3DRV LDO — 3.3V regulated output from 5V USB
- BOOT0 and RESET buttons
- SWD header (SWDIO, SWCLK, 3.3V, GND)
- GPIO headers — all available pins broken out
- Power indicator LED
Bill of Materials
| Designator | Footprint | Qty | Value |
|---|---|---|---|
| BOOT1, RESET1 | SW_SPST_B3U-1000P | 2 | SW_Push |
| C1 | 0402 | 1 | 0.1µF |
| C2, C4, C5 | 0402 | 3 | 1µF |
| C3 | 0402 | 1 | 10µF |
| D1 | 0402 | 1 | LED |
| J1 | USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | 1 | USB_C_Receptacle_USB2.0_16P |
| J2, J3 | PinHeader_1x09_P2.54mm_Vertical | 2 | Conn_01x09 |
| J4 | PinHeader_1x04_P2.54mm_Vertical | 1 | Conn_01x04 |
| R1, R2 | 0402 | 2 | 10kΩ |
| R3, R4 | 0402 | 2 | 5.1kΩ |
| R5 | 0402 | 1 | 1kΩ |
| U1 | TSSOP-20_4.4x6.5mm_P0.65mm | 1 | STM32F042F6Px |
| U2 | WSON-6-1EP_2x2mm_P0.65mm_EP1x1.6mm_ThermalVias | 1 | LP5912-3.3DRV |
Pinout
| Header | Pins |
|---|---|
| J2 | +5V, +3V3 (x2), GND, GPIO_6, GPIO_7, GPIO_8, GPIO_9, GPIO_10 |
| J3 | +5V, GND, GPIO_0–GPIO_5, GND |
| J4 | +3V3, SWDIO, SWCLK, GND |
Schematic
PCB Renders
BOM
will be added later
Programming
will be added later
Repository Structure
Bit32F042F6Px/
├── hardware/
│ ├── Bit32F042F6Px.kicad_sch
│ ├── Bit32F042F6Px.kicad_pcb
│ └── gerbers/
├── images/
│ ├── schematic.png
│ ├── pcb_top.png
│ ├── pcb_bottom.png
│ ├── render_top.png
│ └── render_bottom.png
├── LICENSE
└── README.mdParts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 1uF | Capacitor_SMD:C_0402_1005Metric | C2, C4, C5 |
| 2 | 10k | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R3, R4 |
| 2 | Conn_01x09 | Connector_PinHeader_2.54mm:PinHeader_1x09_P2.54mm_Vertical | J2, J3 |
| 2 | SW_Push | Button_Switch_SMD:SW_SPST_B3U-1000P | BOOT1, RESET1 |
| 1 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | 10uF | Capacitor_SMD:C_0402_1005Metric | C3 |
| 1 | 1k | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J4 |
| 1 | LED | LED_SMD:LED_0402_1005Metric | D1 |
| 1 | LP5912-3.3DRV | Package_SON:WSON-6-1EP_2x2mm_P0.65mm_EP1x1.6mm_ThermalVias | U2 |
| 1 | STM32F042F6Px | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U1 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
Questions
How big is the Bit32F0 PCB?
It measures 27 × 18.7 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Bit32F0 use?
19 parts, built around the LP5912-3.3DRVR. 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 Bit32F0 KiCad files?
From the FaizeenHoque/Bit32F042F6Px repository on GitHub, at the commit this page was made from: the board is Hardware/Bit32F0.kicad_pcb and its schematic Hardware/Bit32F0.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bit32F0 design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 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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