FoxeerF405V2¶
above image and some content courtesy of Foxeer
Where to Buy¶
Available from many retailers including Foxeer
Specifications¶
Processor
STM32F405 32-bit processor
AT7456E OSD
128 MBit flash for logging
Sensors
ICM42688 IMU (accel and gyro only, no compass)
DPS310 barometer
Power
2S - 8S Lipo input voltage with voltage monitoring
5V, 2A BEC for perpherals
10V, 2A BEC for powering Video Transmitter
Interfaces
10x PWM outputs (9th pwm output is for NeoPixel LED string via the LED pad, 10th is labeled SER)
1x RC input
6x UARTs/serial for GPS and other peripherals
1x I2C port for external compass
USB-C port
Switchable Camera Input
Camera control GPIO
External current monitor input
Pinout¶
Solder Pads (not on Connectors below)¶
Pin |
Function |
|---|---|
RSI |
Analog RSSI (0-3.3v) input from receiver |
R2, T2 |
UART2 RX and TX, RC Input(SBUS in on SBUS pin) |
5v |
5v output (1.5A max) |
GND |
Ground |
5v |
5v output (1.5A max) |
B- |
Piezo buzzer negative leg |
LED |
WS2182 addressable LED signal wire |
SBUS |
SBUS input (inverted and applied to R2) |
CA2 |
Camera2 input |
T1 |
UART1 TX |
R3 |
UART3 RX |
T6 |
UART6 TX |
M5 |
Motor/Servo signal output 5 |
M6 |
Motor/Servo signal output 6 |
M7 |
Motor/Servo signal output 7 |
M8 |
Motor/Servo signal output 8 |
SER |
Motor/Servo signal output 10 |
GPS Connector¶
Pin |
Function |
|---|---|
R5 |
UART5 RX, GPS |
T5 |
UART5 TX, GPS |
GND |
Ground |
5V |
5V |
SCL |
I2C Clock |
SDA |
I2C Data |
ESC Connector¶
Pin |
Function |
|---|---|
RX1 |
UART1 RX, ESC Telemetry |
CUR |
External Current Sensor Input |
M4 |
Motor/Servo signal output 4 |
M3 |
Motor/Servo signal output 3 |
M2 |
Motor/Servo signal output 2 |
M1 |
Motor/Servo signal output 1 |
GND |
Ground |
Camera Connector¶
Pin |
Function |
|---|---|
5V |
5V |
GND |
Ground |
CAM1 |
Video input from FPV camera |
CC |
Camera Control GPIO |
VTX Port¶
Pin |
Function |
|---|---|
10V |
10V for VTX |
G |
Ground |
T3 |
UART3 TX, VTX Control(Tramp default) |
G |
Ground |
VTX |
Video output to video transmitter |
HD VTX Connector (DJI)¶
Pin |
Function |
|---|---|
10V |
10V for VTX |
G |
Ground |
T4 |
UART4 TX, DisplayPort |
R4 |
UART4 RX, DisplayPort |
G |
Ground |
R6 |
UART66 RX |
UART Mapping¶
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. Default protocols are shown below but may be changed by the user.
SERIAL0 -> USB
SERIAL1 -> UART1 (ESC telemetry)
SERIAL2 -> UART2 (RC) DMA-enabled
SERIAL3 -> UART3 (VTX Tramp)
SERIAL4 -> UART4 (DisplayPort) DMA-enabled
SERIAL5 -> UART5 (GPS) DMA-enabled
SERIAL6 -> UART6 (User)
Any UART may be re-tasked by changing its protocol parameter.
RC Input¶
RC input is configured on the R2 (UART2_RX) pin. It supports all RC protocols except PPM and SBUS. See Radio Control Systems for details for a specific RC system. SERIAL2_PROTOCOL is set to “23”, by default, to enable this.
SBUS connects to the SBUS pad which inverts the input and applies it to to R2 input.
FPort requires connection to T2 and SERIAL2_OPTIONS be set to “7”.
CRSF also requires a T2 connection, in addition to R2, and automatically provides telemetry. Set SERIAL2_OPTIONS to “0”.
SRXL2 requires a connecton to T2 and automatically provides telemetry. Set SERIAL2_OPTIONS to “4”.
Any UART can be used for RC system connections in ArduPilot also, and is compatible with all protocols except PPM. See Radio Control Systems for details.
OSD Support¶
The FoxeerF405v2 supports OSD using OSD_TYPE 1 (MAX7456 driver). The defaults are also setup to allow DJI Goggle OSD support on UART4. Both the internal analog OSD and the DisplayPort OSD can be used simultaneously by setting OSD_TYPE2 = 5
PWM Output¶
The FoxeerF405v2 supports up to 10 PWM outputs (PWM 9 is defaulted to serial LED support). Outputs are available via two JST-SH connectors. All outputs support DShot,as well as all PWM types.
The PWM is in 3 groups:
PWM 1, 4 in group1
PWM 2, 3 in group2
PWM 6-8 in group3
PWM 5, 9 (LED) in group4
PWM 10 in group5
Channels within the same group need to use the same output rate, whether PWM or Dshot. If any channel in a group uses DShot then all channels in the group need to use DShot.
Note
by default PWM9 is configured as an LED output, making PWM5 only usable as a serial LED also. You can re-assign PWM9’s function to something else if you wish to use PWM5 normally.
Note
for users migrating from BetaflightX quads, the first four outputs M1-M4 have been configured for use with existing motor wiring using these default parameters:
FRAME_CLASS = 1 (Quad)
FRAME_TYPE = 12 (BetaFlightX)
GPIO and Camera Switch¶
GPIO pin 70 is the SER pad and is assigned by default to RELAY2 functionality. This pin can be controlled via GCS or by RC transmitter using the Auxiliary Functions feature.
Camera input can be switched between CAM1 input and CA2 input using GPIO 71 which is assigned by default to the RELAY3 functionality. It can be controlled like the GPIO above.
LED Output¶
The LED output is configured by default to support NeoPixel LED strings.
Battery Monitoring¶
The board has a built-in voltage sensor via the B+ pin, but no internal current sensor. An external current sensor can be connected to the CUR pin. Default parameters for both internal voltage and external current monitoring are set by default to the below for use with any Holybro Tekko32 F4 4in1 ESC.
The correct battery setting parameters are:
BATT_AMP_PERVLT 142 but varies depending on external current sensor
Compass¶
The FoxeerF405v2 does not have a built-in compass, however you can attach an external compass using I2C on the SDA and SCL pads.
Firmware¶
Firmware for this board can be found here in sub-folders labeled “FoxeerF405v2”.
Loading Firmware¶
Initial firmware load can be done with DFU by plugging in USB with the bootloader button pressed. Then you should load the “with_bl.hex” firmware, using your favourite DFU loading tool.
Once the initial firmware is loaded you can update the firmware using any ArduPilot ground station software. Later updates should be done with the *.apj firmware files.