8 layers35 × 35 mm
OpenAIO
OpenDrone-hw/OpenAIO
Open-source AIO for 2-6S toothpick quads: flight controller, 4-in-1 AM32 ESC and ExpressLRS receiver, 25.5x25.5 mm.
343 parts19CERN-OHL-S-2.0
6 layers26.9 × 26.9 mm
Open-source Betaflight flight controller. RP2354A, 20x20 mm, 6-layer, 3-6S, CERN-OHL-S-2.0.
- Size
- 26.9 × 26.9 mm
- Copper layers
- 6
- Thickness
- 1 mm
- Parts
- 131
- Nets
- 87
- Pads
- 485
- Tracks, vias
- 746, 317
- Pours
- 23
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 26 Mar 2026
- Updated
- 25 Oct 2026
Overview
OpenFC is an open-source printed circuit board by OpenDrone-hw, from the OpenDrone-hw/OpenFC-Lite-Mini repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 6-layer board of 26.9 × 26.9 mm with 131 parts on 87 nets, routed with 746 tracks and 317 vias.
It is built around the RP2354A, COS8051SOT and TF-021B-H265, with the BMI270, LP5912-3.3DRVR and SM06B-SRSS-TB(LF)(SN) among its other parts. Its parts include 35 capacitors, 35 connectors, 34 resistors, 11 ICs and 8 diodes. It belongs with the robots and motor control boards and the RP2350 boards of this library.
Main components
12
RP2354A
QFN-60(7x7)150MHz 32 Bit ARM Cortex-M33 Built-in+External Power-on reset (POR)、Undervoltage detection (BOR/LVD/LVR/LVI)、Watchdog reset、Built-in general-purpose timer、Integrated LDO、Calendar function、True random number generator (TRNG)、Hardware ECC check、Independent watchdog (IWDG) QFN-60(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
COS8051SOT
SOT23-5-2.25V~2.25V -40℃~+125℃ 1 100MHz 100mA 125dB 150V/us 1pA 2.5V~5.5V 2.5pA 2.6mA 2uV/℃ 5mV 8nV/√Hz@1kHz Built-in compensation Rail-to-Rail Input, Rail-to-Rail Output SOT23-5 Operational Amplifier ROHSCOSINEOperational Amplifier
TF-021B-H265
SMD-25℃~+75℃ 2.5mm Connector and Ejector MicroSD Card (TF Card) Push-Pull SMD SD Card / Memory Card Connector ROHSSOFNGSD Card / Memory Card Connector
BMI270
LGA-14(2.5x3)-40℃~+85℃ 1.71V~3.6V 16bit 2KB 3.5uA Accelerometer Gyroscope SPI、I2C X,Y,Z X,Y,Z ±16g ±2000dps LGA-14(2.5x3) Accelerometers ROHSBosch SensortecAccelerometers
LP5912-3.3DRVR
WSON-6-EP(2x2)-40℃~+125℃@(Tj) 1 12uVrms 180mV@(500mA) 3.3V 30uA 500mA 6.5V 75dB@(1kHz) Fixed Over Temperature Protection、Reverse connection protection、Soft Start、Short Circuit Protection Positive WSON-6-EP(2x2) Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
SM06B-SRSS-TB(LF)(SN)
SMD,P=1mm,卧贴-25℃~+85℃ 1 1A 1mm 1x6P 2.9mm 4.32mm 50V 6 6P 8mm Auxiliary Solder Pin Copper alloy PA SH Surface Mount, Right Angle Tin UL94V-0 White SMD,P=1mm,Surface Mount，Right Angle Wire To Board Connector ROHSJSTWire To Board Connector
0201WMF1003TEE
0201-55℃~+155℃ 100kΩ 25V 50mW Thick Film Resistor ±1% ±200ppm/℃ 0201 Chip Resistor - Surface Mount ROHSUNI-ROYALChip Resistor - Surface Mount0201WMF5101TEE
0201-55℃~+155℃ 25V 5.1kΩ 50mW Thick Film Resistor ±1% ±200ppm/℃ 0201 Chip Resistor - Surface Mount ROHSUNI-ROYALChip Resistor - Surface Mount
XL-1005UGC
0402-40℃~+85℃ 120° 1mm x 0.5mm square LED 249mcd 25mA 3V 516nm~531nm 531nm 80mW Discrete Diode Emerald Green Top-mount Water Clear 0402 LED Indication - Discrete ROHSXINGLIGHTLED Indication - DiscreteNQ01WMJ0300TEE
0201-55℃~+155℃ 25V 30Ω 50mW Thick Film Resistor ±200ppm/℃ ±5% 0201 Chip Resistor - Surface Mount ROHSUNI-ROYALChip Resistor - Surface Mount0201WMF1001TEE
0201-55℃~+155℃ 1kΩ 25V 50mW Thick Film Resistor ±1% ±200ppm/℃ 0201 Chip Resistor - Surface Mount ROHSUNI-ROYALChip Resistor - Surface Mount
CL21A475KBQNNNE
08054.7uF 50V X5R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
README
README.mdOpenFC-Lite-Mini
Open source Betaflight flight controller built on the RP2354A, 20 x 20 mm mounting pattern, part of the incutec OpenDrone line.
Specifications
| Firmware | Betaflight |
| MCU | RP2354A |
| IMU | BMI270 |
| Barometer | None |
| Blackbox | microSD |
| OSD | Analog and digital |
| UARTs | 3 |
| Motor outputs | 4x DShot, bidirectional |
| RX | External, CRSF or SBUS |
| Input | 3-6S* LiPo (9.0-25.2 V) |
| BEC | 10 V switchable + 5 V always-on, 3 A |
| Current sense | Yes |
| USB | USB-C |
| Mounting | 20 x 20 mm, 3.0 mm holes |
| Dimensions | 26.9 x 26.9 mm |
| PCB | 6-layer, 1.6 mm |
- Also runs on 2S; the 10 V VTX output then follows the battery voltage instead of holding 10 V.
Technical write-up, part list and layout constraints: AGENTS.md.
Firmware
Betaflight, target OPENFC_LITE_MINI_RP2350A. The current image is in
firmware/; older ones are in firmware/archive/.
Boards flashed before 2026-10-25 show no analog OSD while the LED strip feature is on, and a WS2812 strip on the LED pad shows wrong colours. The current image fixes both. To update:
- In Betaflight Configurator, CLI tab: run
diff alland save the output. - Run
bl rom. The board reboots as a USB drive namedRP2350. - Copy the
.uf2fromfirmware/onto that drive. The board restarts on its own. - Reconnect and check your settings; paste the saved
diff allback if anything is missing.
Without updating, feature -LED_STRIP then save in the CLI brings the
OSD back (the LED strip is then off).
In the line
What pairs with what, and what is available: opendrone.be.
Contributing
See CONTRIBUTING.md.
License
Hardware licensed under CERN-OHL-S-2.0, see LICENSE.
Parts
131| Qty | Value | Footprint | References |
|---|---|---|---|
| 34 | 5V | lib:small_pad | J10, J12, J14, J15, J17, J18, J20, J21, J22, J24, J25, J26, J27, J28, J29, J30 +18 |
| 20 | 100n | Capacitor_SMD:C_0201_0603Metric | C1, C3, C4, C11, C12, C13, C22, C26, C27, C32, C35, C36, C39, C41, C42, C43 +4 |
| 5 | 4.7uF | Capacitor_SMD:C_0402_1005Metric | C31, C37, C44, C45, C46 |
| 4 | 100k | Resistor_SMD:R_0201_0603Metric | R1, R23, R29, R31 |
| 4 | 10k | Resistor_SMD:R_0201_0603Metric | R2, R38, R39, R49 |
| 4 | 5.1k | Resistor_SMD:R_0201_0603Metric | R3, R4, R6, R7 |
| 4 | 75R | Resistor_SMD:R_0201_0603Metric | R41, R48, R52, R53 |
| 4 | LED_1_Green | LED_SMD:LED_0402_1005Metric | D4, D5, D7, D8 |
| 3 | 30R | Resistor_SMD:R_0201_0603Metric | R15, R24, R37 |
| 3 | 510R | Resistor_SMD:R_0201_0603Metric | R36, R46, R47 |
| 2 | 1k | Resistor_SMD:R_0201_0603Metric | R5, R9 |
| 2 | 2.4k | Resistor_SMD:R_0201_0603Metric | R50, R51 |
| 2 | 20p | Capacitor_SMD:C_0201_0603Metric | C6, C10 |
| 2 | 22uF | Capacitor_SMD:C_0603_1608Metric | C28, C29 |
| 2 | 22uF | Capacitor_SMD:C_0402_1005Metric | C33, C34 |
| 2 | 4.7uF 50v | Capacitor_SMD:C_0805_2012Metric | C24, C25 |
| 2 | 6.49k | Resistor_SMD:R_0201_0603Metric | R30, R34 |
| 2 | AP1606 | lib:DFN-3L_L1.0-W0.6-P0.65-BR | Q5, Q6 |
| 2 | DSK24 | lib:SOD-123_L2.8-W1.8-LS3.7-RD | D6, D10 |
| 2 | LMR51430YFDDCR | lib:SOT-23-6_L2.9-W1.6-P0.95-LS2.9-BL | U3, U4 |
| 2 | XRTC303020D4R7MBCA | lib:IND-SMD_L3.0-W3.0_AFE303020S | L2, L3 |
| 1 | 1.4k | Resistor_SMD:R_0201_0603Metric | R44 |
| 1 | 12k | Resistor_SMD:R_0201_0603Metric | R43 |
| 1 | 13.7k | Resistor_SMD:R_0201_0603Metric | R32 |
| 1 | 1uF | Capacitor_SMD:C_0402_1005Metric | C40 |
| 1 | 3.9k | Resistor_SMD:R_0201_0603Metric | R42 |
| 1 | 470p | Capacitor_SMD:C_0201_0603Metric | C38 |
| 1 | 680R | Resistor_SMD:R_0201_0603Metric | R45 |
| 1 | 7.5k | Resistor_SMD:R_0201_0603Metric | R33 |
| 1 | AOTA-B201610S3R3-101-T | lib:IND-SMD_L2.0-W1.6_AOTA-B201610S3R3-101-T | L4 |
| 1 | BMI270 | lib:LGA-14_L3.0-W2.5-P0.50-BR | U9 |
| 1 | COS8051SOT | lib:SOT-23-5_L3.0-W1.7-P0.95-LS2.8-BR | U1 |
| 1 | LED_1_Blue | LED_SMD:LED_0402_1005Metric | D2 |
| 1 | LP5912-1.8DRVR | lib:WSON-6-1EP_2x2mm_P0.65mm_EP1x1.6mm_ThermalVias | U12 |
| 1 | LP5912-3.3DRVR | Package_SON:WSON-6-1EP_2x2mm_P0.65mm_EP1x1.6mm | U7 |
| 1 | RP2354A | lib:QFN-60_L7.0-W7.0-P0.40-TL-EP3.4 | U10 |
| 1 | SDM02U30LP3-7B | lib:X3-DFN0603-2_L0.6-W0.3-RD | D9 |
| 1 | SM06B-SRSS-TB(LF)(SN) | lib:CONN-SMD_SM06B-SRSS-TB-LF-SN | U8 |
| 1 | SM08B-SRSS-TB(LF)(SN) | lib:CONN-TH_SM08B-SRSS-TB-LF-SN | P1 |
| 1 | SN74LVC1G3157DTBR | lib:X2SON-6_L1.0-W0.8-BL | U18 |
| 1 | TF-021B-H265 | lib:TF-SMD_TF-021B-H265 | Card1 |
| 1 | TLV7031DPWR | lib:X2SON-4_L0.8-W0.8-P0.48-TL-A | U2 |
| 1 | TS2306A 240GF MSM 9_C2976675 | lib:SW-SMD_4P-L3.0-W2.0-P0.85-LS3.5 | U11 |
| 1 | TYPE-C 16P QTWT | lib:USB-TYPE-C-SMD_TYPE-C-16P-QTWT | USB1 |
| 1 | XTM25012000JT00351001 | lib:CRYSTAL-SMD_4P-L2.5-W2.0-BL-A | X1 |
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Questions
How big is the OpenFC PCB?
It measures 26.9 × 26.9 mm and has 6 copper layers, 1 mm thick.
What parts does the OpenFC use?
131 parts, built around the RP2354A, COS8051SOT, TF-021B-H265 and BMI270. 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 OpenFC KiCad files?
From the OpenDrone-hw/OpenFC-Lite-Mini repository on GitHub, at the commit this page was made from: the board is hardware/OpenFC.kicad_pcb and its schematic hardware/OpenFC.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the OpenFC 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).