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The SpeedyBee F405 V3 30x30 is a compact flight controller for a range of drone frames. The page says it uses an STM32F405 processor with an ARM Cortex-M4 core, and has a built-in barometer, an SD card slot for up to 4 GB and a DJI Air Unit connector for digital installs.
It has 22 mm cutouts for fitting FPV cameras in compact builds, four UARTs and individual 9V 2A and 5V 2A BECs. Bluetooth is supported (MSP on UART4 at 115200 baud) and Wi-Fi is not. The page lists compatibility with the DJI O3, RunCam Link, Caddx Vista and V1. At the time of the check the page showed it as sold out.
STM32F405 MCU: with an ARM Cortex-M4 core.
BMI270 IMU: as listed.
Built-in barometer: for precise height measurement.
Dedicated DJI Air Unit connector: for easy digital setup.
SD card slot up to 4 GB: for blackbox data.
Four UARTs: for receiver, VTX, camera and GPS.
A flight controller is the brain of a multirotor or fixed-wing aircraft. It reads the gyroscope, and where fitted the accelerometer, barometer and compass, and runs a control loop that compares what the aircraft is doing with what the pilot asks for. It then sends new speed commands to the motors through the ESCs or servos many times each second. A faster processor and a better gyro allow a higher loop rate and a more locked-in feel.
Wiring and firmware decide what the board can do. The number of UARTs limits how many receivers, GPS units, telemetry radios and video systems you can connect, the PWM or motor outputs limit how many motors and servos it can drive, and the input voltage range must suit your battery and power module. Before you buy, check that the firmware you want to run supports the board and that its mounting pattern fits your frame.
Set up carefully. Flash a firmware that is listed as supported, configure the receiver protocol, set the motor order and direction, calibrate the accelerometer and, for larger aircraft, the compass, and always test with the propellers removed first. Keep the board isolated from vibration with soft mounts where the design calls for them, and never power it with a supply that is outside the rated input voltage.
Keep the aircraft safe. Confirm your failsafe settings and arming switch before the first flight, keep a backup of your configuration, and update firmware only when you have a reason to. A flight controller is a safety-critical part, so use the wiring diagram from the maker and avoid guesswork with power connections.
FPV freestyle
DJI digital builds
Compact frames
Blackbox logging
Bluetooth tuning
The DJI Air Unit connector suits the O3, RunCam Link, Caddx Vista and V1. The page lists Wi-Fi as not supported.
The four UARTs are meant for receiver, VTX, camera and GPS, so plan your wiring around them.
MCU: STM32F405
IMU: BMI270
USB: Type-C
OSD chip: AT7456E
Bluetooth: supported (MSP on UART4, 115200 baud)
Wi-Fi: not supported
DJI Air Unit: compatible with O3, RunCam Link, Caddx Vista, V1
BEC: 9V 2A and 5V 2A
UARTs: 4
SD card slot: up to 4 GB
1 x SpeedyBee F405 V3 30x30 flight controller
Freestyle pilots who want a DJI-ready F405 board.
An STM32F405.
BMI270.
Yes. Wi-Fi is not supported.
Four.
The O3, RunCam Link, Caddx Vista and V1.
| Brand | SpeedyBee |
|---|---|
| Barometer | built-in |
| Gyro Sensor | BMI270 |
| MCU / Processor | STM32F405 |
| Mounting Size | 30x30mm |
| OSD Chip | AT7456E |
| UART Count | 4.000000 |
| USB Type | Type-C |
| Selling unit | PCS |
