STM32F407VGT6 multifunction board

The overall price of the project is about 100 yuan, and the functions are being developed and verified...
 
1. Bring out USB and serial ports, use CH9102X to convert serial to USB, low-cost and small-volume solution
2. The power supply uses SY8089 DC-DC step-down module, and the GPS positioning signal module is LDO stepped down
3. In order to reduce the impact of ripple on the digital and analog accuracy of the microcontroller, DVCC uses TL431 as the 3.3V reference power supply
4. Equipped with GP-02 module, basic positioning can be performed (low-cost solution) (not welded)
5. Equipped with a gyroscope MPU6050
6. Equipped with a digital audio decoder, and supports audio output and input, and reserved interfaces for speakers and microphones
7. Equipped with an SD card, using SDIO mode, and using SPI to plug in a 128Mbit flash module
8. Reserved LCD interface of the FPC mother seat, which can be transferred to the LCD screen
9. Contains a LAN8720 as a physical layer network port
10. Reserved three user buttons
 
In order to reduce the contact of solder and increase the beauty of the project, the project uses the panel printing service of Lichuang, and the panel file is in the attachment
! ! ! Important:
The project content is being debugged one after another. As shown in the project, the PCB has iterated 3 versions. It is not recommended to try to make a board unless necessary