SOWA_FC

The main goal of this project is to create an open-source STM32 based flight controller SOWA F4

Current status: everything works fine, no problems found.

Features:

• STM32F405 microcontroller
• ICM42688P gyroscope + accelerometer
• Blackbox (16Mb)
• OSD
• 3-8S voltage
• Powerful 3.5A DC converters allow you the usage of almost every high-consumption peripherals
• 3.3V (500mA) / 5V (3.5A) / 10V (3.5A) rails
• SCL and SDA pins for GPS
• 6 UARTs
• 8 motor/servo outputs
• RX4 inverter (for SBUS)
• Voltage & current sensor
• SWD and SWC pins for direkt programming via bootloader (ex. ST-Link)

Size: 40/40/1,6 mm

Drill diameter: 4 mm

Drill distance: 30,5 mm (center to center)

Wiring diagram:

Software flashing

At this moment, it is only available to flash the software to the board as an unofficial Betaflight target. 1) Make sure you have installed all the needed drivers (Zadig, ImpulseRS) 2) Connect the board to your PC via TYPE-C cable while holding the "BOOT" button. After that, a device in DFU mode should be detected 3) Go to "Firmware Flasher" tab and load the .hex file by clicking on the "Load Firmware [Lokal]" tab 4) Click the "Flash Firmware" button 5) Once the firmware flashed successfully, press the "Connect" button and go to the "CLI" tab 6) Press "Load from file" button and select .config file 7) Load the commands to the CLI and reconnect the FC

Schematics

This board is designed in the EasyEDA PCB creating tool. Here is the link where you can find all the schemas: https://oshwlab.com/poplavskyib/SOWA_F4

PCB purchase

Starting from June 2024, you have a great opportunity of purchasing the first version of SOWA F4 flight controller. The PCB is manufactured in Ukraine. Delivery is carried out from Ukraine by courier service of Nova Post or Ukrposhta within its borders, as well as in the European Union and the United States. Please contact me if you want to buy the board to request the exact price. *All profits will be used to improve this project and to develop new ones.

The board comes with a set of dampfers (4 pcs)

My contacts

For any questions or suggestions feel free to write me either by E-Mail poplavskiyb@gmail.com or via Telegram at @Poplavskyib (https://t.me/poplavskyib)

Sponsors

I would like to express my sincere gratitude to the OSHWlab Stars program for their significant assistance in funding this project.