StellarF4 V2 Flight Controller

Stellar F4V2 is an autopilot by Stingbee.

Features

  • Processor

    • STM32F405

  • Sensors

    • ICM-42688p Acc/Gyro with external clock feature

    • DPS310/BMP280 barometer

    • AT7456E OSD

    • W25Q128 dataflash

  • Power

    • 2S-8S Lipo input voltage with voltage monitoring

    • 12V, 3A BEC for powering Video Transmitter

    • 5V, 2A BEC for internal and peripherals

  • Interfaces

    • 11x PWM outputs DShot capable, PWM1-4 DShot capable

    • 4x UARTs

    • 1x I2C

    • 2x ADC

    • SPI flash for logging

    • USB-C port

  • LED

    • Red, 3.3V power indicator

    • Green, FC status

  • Size

    • 41 x 41mm PCB with 30.5mm M3 mounting

Pinout

../_images/StellarF4V2-top.png ../_images/StellarF4V2-bot.png

UART Mapping

The UARTs are marked RXn and TXn in the above pinouts. The RXn pin is the receive pin for UARTn. The TXn pin is the transmit pin for UARTn.

  • SERIAL0 -> USB

  • SERIAL1 -> UART2 (Serial RC input, DMA capable)

  • SERIAL2 -> UART3 (User)

  • SERIAL3 -> UART4 (DisplayPort)

  • SERIAL4 -> UART5 (ESC Telemetry)

RC Input

The default RC input is configured on the UART2(SERIAL1) RX2 input and can be used for all ArduPilot supported unidirectional receiver protocols except PPM.

  • SBUS/DSM/SRXL connects to the RX2 pin.

  • CRSF also requires a TX2 connection, in addition to RX2, and automatically provides telemetry.

  • FPort requires connection to TX2 and SERIAL1_OPTIONS set to “7”. See FPort Receivers.

  • SRXL2 requires a connection to TX2 and automatically provides telemetry. Set SERIAL1_OPTIONS to “4”.

OSD Support

StellarF4V2 supports using its internal OSD using OSD_TYPE 1 (MAX7456 driver). External OSD support such as DJI or DisplayPort can be used simultaneously and is preconfigured on SERIAL3 but can be supported on any spare UART. See MSP OSD for more info.

PWM Output

StellarF4V2 supports up to 11 PWM/Dshotg outputs. PWM1-4 outputs support Bi-Directional DShot.

Channels 1-4 support bi-directional DShot. Channels 5-8 marked as S1M5-S4M8 on the board. Channels 9-11 marked as S5-S7 on the board. PWM outputs are grouped and every group must use the same output protocol:

  • 1, 2, 3, 4 are Group 1;

  • 5, 6, 7, 8 are Group 2;

  • 9, 10, 11 are Group 3;

Battery Monitoring

The board has 1 built-in voltage divider on an ADC input and 1x current ADC input and supports and external 3.3V based current sensor. The voltage input is compatible with 2~8S LiPo batteries.

The default battery parameters are:

Compass

StellarF4V2 does not have a built-in compass, but you can attach an external compass using I2C on the SDA and SCL pads.

Camera Switch

GPIO 81 controls which camera input (CAM1 or CAM2) is applied to the internal OSD. A RELAY function can be enabled to control the switching.

Loading Firmware

Firmware for these boards can be found at https://firmware.ardupilot.org in sub-folders labeled StellarF4V2.

Initial firmware load can be done with DFU by plugging in USB with the boot button pressed. Then you should load the “ardu*_with_bl.hex” firmware, using your favourite DFU loading tool. eg STM32CubeProgrammer

Subsequently, you can update firmware with Mission Planner.