Acci FC Flight Controller F4 ELITE

Drone Flight Controller  (30x30)

Compatible with AT32F435 & STM32F405 

A high-performance drone flight controller in a 30x30 mounting form factor, designed for both STM32F405 and AT32F435 microcontrollers. 

Choose between the STM32F405 for widespread compatibility or the more powerful and cost-effective AT32F435. Both are fully supported on the same PCB. The recommendation is AT32F435.

✳️ Key Features

• MCU Options:  
  • AT32F435
  • STM32F405
• Gyroscope
  • ICM-42688-P  
  • Powered by a dedicated 3.3V rail to suppress electrical noise and enhance signal stability
• Barometer
  • DPS368 for accurate altitude measurement
• Blackbox Flash Memory
  
  • W25Q128JVSIQTR
  • Supports up to 128MB of onboard logging
• UARTs
  • 6 hardware UART ports for peripherals
• USB Interface
  • USB Type-C for modern connectivity and ease of use
• Power System
  • 5V and 10V power rails using MP9943GQ-Z high-efficiency DC-DC converters
  • 3.3V power rails powered by TPS7A2033 low-noise LDO regulators
• Video & Peripherals
  • Dedicated 10V pad for DJI/Walksnail/HDZero video systems
• Other Components
  • Buzzer driver
  • Reliable power filtering and decoupling

Be aware that UART 3 and UART2 connected peripherals may disable DFU mode. This is really common on most the FCs but manufactures usually does not make it public.

• UART3 with RX or GPS are prone to hijiack DFU mode, if that 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.

This will only affect when enabling DFU mode and some peripherals are on those ports, not all peripherals will be an issue. Use first any of the other 4 UARTS available if possible.

 

🔧 Development Status

 

The board is currently in development, with successful validation of the following components:

 

• Microcontroller (F405 & F435)
• Clock circuit
• All UART ports
• Gyroscope (ICM-42688-P)
• Barometer (DPS368)
• 5V, 10V, and 3.3V rails
• Flash memory (W25Q128)
• USB-C interface
• Buzzer output

 

More updates coming soon. Stay tuned for firmware support, build instructions, and pinout diagrams.

Thanks to OSHWLab for the prototyping support

 

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