Acci FPV Flight Controller - Betaflight STM32F405 / AT32F435

STM32F405 & AT32F435 Flight Controller for Betaflight firmware drones.

Yes, you can use any of those CPU with the same board. AT32 is more powerful, cheap and fully supported, I recommend use AT32F435.

The main idea of this project is to learn and play while designing a functional F4 Flight Controller compatible with Betaflight firmware.

The FC has been flying in racing drones for 2 years already, tested by more than 5 pilots without issues.

Specs

• STM32F405 or AT32F435 (I recommend AT32F435)
• 6 UARTS
• MPU600 Gyro (also BMI and ICM)
• Blackbox - 128MB!
• 10v pad for DJI
• BMP280 Barometer
• OSD Support
• 3-6S voltage
• Buzzer pads
• SDA/SCL for GPS reconfiguring UART3

First test flight video

• UART3 with RX or GPS are prone to this, if it happens to you, desolder it temporarily. 
• UART2 should be less than an issue as is mostly reserved for ESC and no devices should be connected.

How to load betaflight

AUTOMATIC

Betaflight now oficially has the target for this board available

MANUALLY

STM32F405 Chip

• Betaflight 4.5
  • Download Betaflight repo and compile the firmware for the next target file 
  • Acci FC - Target files (github.com)
• Betaflight < 4.5
  • Download Betaflight configurator 10.8 and flash the firmware version you prefer of the target STM32F405.
  • Once the firmware is loaded connect and enter cli to load the board configuration
  • Acci FC - Target files (github.com)

AT32F435 Chip

I have already succesfully build and run the design on a AT32F435 microcontroller with Betaflight 4.5. 

• Betaflight 4.5
  • Download Betaflight repo and compile the firmware for the next target file  
  • Acci FC - Target files (github.com)

All the targets can be found here: Acci FC - Target files (github.com)

Inspired in:

• https://oshwlab.com/Heinzeri/owl-f7-v1-fc (special thanks)
• https://oshwlab.com/mesh.drone/mesh-fc-v1-backup