Processor and Sensors
STM32F405 ARM microcontroller
ICM42688 IMU (Gyro and Accelerometers)
16Mbytes logging flash
9x PWM outputs (PWM9 for Neopixel LED)
1x RC input (PWM/PPM, SBUS)
6x serial port inputs (including RC input listed above)
1x I2C for external compass or airspeed sensor
4 in 1 ESC connector
DJI Air Unit connector
9V ~ 25V DC input power (3S-6S)
5V 2A BEC for peripheral
10V 2A for Video
Size and Dimensions
20mm x 20mm or 30.5mm x 30.5mm mount pattern
Where to Buy¶
Available from various retailers and directly from the manufacturer Flywoo
The UARTs are marked Rn and Tn in the above pinouts. The Rn pin is the receive pin for UARTn. The Tn pin is the transmit pin for UARTn.
SERIAL0 -> USB
SERIAL1 -> USART1 (GPS)
SERIAL2 -> USART2 (RX only,ESC Telemetry)
SERIAL3 -> USART3 (DJI, DMA Enabled)
SERIAL4 -> UART4 (SBUS pin is inverted and connects to RX pin)(TX DMA Enabled) For normal UART use, BRD_ALT_CONFIG = 1.
SERIAL5 -> UART5 (RX5 is fed from an inverter connected to DJI connector’s SBUS pin, no TX pin)
SERIAL6 -> UART6 (RC serial input, DMA-enabled)
RC input is configured on the SBUS pin which is inverted and feeds the R4 (UART4_RX) pin for most RC unidirectional protocols, including PPM.
For CRSF/ELRS/SRXL2 connection of those to UART6 is pre-configured.
The FlywooF405 Pro supports up to 9 PWM outputs. The M1 to M4 outputs are on the esc connector and are bi-directional DShot capable, M5 to M8 on solder pads and DShot capable, plus LED pad(PWM output 9) for LED strip or another PWM output.
The PWM is in 3 groups:
PWM 1-2,5,7 in group1
PWM 3-4 in group2
PWM 6,8 in group2
PWM 9 in group3
Channels within the same group need to use the same output protocol. If any channel in a group uses DShot then all channels in the group need to use DShot. Channels 1-4 also support bi-directional DShot.
The FlywooF405 Pro outputs can be used as GPIOs (relays, buttons, RPM etc). To use them you need to set the output’s
SERVOx_FUNCTION to -1. See GPIOs page for more information.
The numbering of the GPIOs for PIN variables in ArduPilot is:
RSSI/Analog Airspeed Input¶
An analog input is provided and its reference pin number is “10”
The FlywooF405 Pro has an on-board OSD using OSD_TYPE = 1 (MAX7456 driver). The CAM and VTX pins provide connections for using the internal OSD.
DJI Video and OSD¶
A JST-GH-6P connector supports a standard DJI HD VTX connection and SERIAL3 is already setup for this by default. Pin 1 of the connector is 10v so be careful not to connect this to any peripheral requiring 5v.
The board has a internal voltage sensor and connections on the ESC connector for an external current sensor input. The voltage sensor can handle up to 6S LiPo batteries.
The default battery parameters are:
The FlywooF405 Pro does not have a builtin compass, but you can attach an external compass using I2C on the SDA and SCL pads.
This board does not come with ArduPilot firmware pre-installed. Use instructions here to load ArduPilot the first time Loading Firmware onto boards without existing ArduPilot firmware.
Firmware for this board can be found here in sub-folders labeled “FlywooF405Pro”. Firmware is provided only for Copter/Heli but may be built for other vehicles using the ArduPlot Custom Firmware Build Server