STM32F4-based core board

I wanted to make a smart remote-controlled car toy for my unborn child, controlled by an STM32F4, hence the idea of ​​creating a core board.
This core board uses the STM32F407VET6 main chip, measuring 60*70mm, with pins extended on both sides for easy expansion with power strips. It also integrates common functions such as OLED and BLE. Features
include: 1. All useful pins are brought out, with additional 3.3V and 5V power pins for peripherals;
2. Power indicator and indicator lights on two I/O ports for easy debugging;
3. Built-in CH340C module for direct serial connection to a computer, supporting one-click download of software like FlyMCU;
4. SWD download and debugging;
5. Support for common 0.96-inch I2C OLED screens;
6. Support for 5V Bluetooth for connection to USART3;
7. Support for the MPU6050 sensor;
8. One M3 screw mounting position at each of the four corners.