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README.md
iFlight BLITZ Wing H743 Flight Controller
The BLITZ Wing H743 is a flight controller produced by iFlight.
Features
- MCU - STM32H743 32-bit processor running at 480 MHz
- Gyro: ICM42688
- SDCard for logging
- 5V 3A BEC for Flight Controller
- 9V 3A BEC for VTX
- 5-8.4V 6A BEC for Servo
- Barometer: DPS310
- OSD: AT7456E
- 7x UARTs
- 13x PWM Outputs (12 Motor Output, 1 LED)
- Battery input voltage: 2S-8S
- 2x I2C for external compass, airspeed, etc.
- CAN port
Physical
- Mount pattern: 30.5*30.5mm/?4
- Dimensions: 36.9*52mm
- Weight: 35g
Pinout
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.
| Name | Pin | Function |
|---|---|---|
| SERIAL0 | COMPUTER | USB |
| SERIAL1 | RX1/TX1 | UART1 (DJI connector, DMA-enabled) |
| SERIAL2 | TX2/RX2 | UART2 (RX, DMA-enabled) |
| SERIAL3 | TX3/RX3 | UART3 (DMA-enabled) |
| SERIAL4 | TX4/RX4 | UART4 (GPS, DMA-enabled) |
| SERIAL6 | TX6/RX6 | UART6 |
| SERIAL7 | TX7/RX7 | UART7 |
| SERIAL8 | TX8/RX8 | UART8 (ESC Telemetry) |
RC Input
RC input is configured on the (UART2_RX/UART2_TX) pins which forms part of the DJI connector. It supports all serial RC protocols.
OSD Support
The BLITZ Wing H743 supports OSD using OSD_TYPE 1 (MAX7456 driver). Simultaneously, DisplayPort HD OSD is enabled by default and available on the HD VTX connector.
PWM Output
The BLITZ Wing H743 has 13 PWM outputs. The first 8 outputs support bi-directional DShot and DShot, as well as all PWM types. Outputs 9-10 support DShot, as well as all PWM types and outputs 11-12 only support PWM.
The PWM are in in five groups:
- PWM 1-2 in group1
- PWM 3-6 in group2
- PWM 7-10 in group3
- PWM 11-12 in group4
- PWM 13 in group5
Channels within the same group need to use the same output rate. If any channel in a group uses DShot then all channels in the group need to use DShot.
Video Power Control
The 9V video power can be turned off/on using GPIO 81 which is already assigned by default to RELAY2. This relay can be controlled either from the GCS or using a transmitter channel (See :ref:common-auxiliary-functions)
Analog Airspeed Input
The analog airspeed pin is "4"
Battery Monitoring
The board has a built-in voltage sensor and current sensor. The voltage sensor can handle up to 8S LiPo batteries.
The correct battery setting parameters are:
- BATT_MONITOR 4
- BATT_VOLT_PIN 10
- BATT_VOLT_MULT 11
- BATT_CURR_PIN 11
- BATT_CURR_MULT 50
These are set by default in the firmware and shouldn't need to be adjusted
Compass
The BLITZ Wing H743 does not have a builtin compass, but you can attach an external compass to I2C pins.
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. Updates should be done with the *.apj firmware files.