LilyGo esp32s2

1. Before using this project, please set up the esp-idf environment, specific reference esp-idf-docs
2. Clone the project and then allow idf.py build
3. Use idf.py -p [your port] -b 115200 flash to download to the board

Information for new users:

• If you have an SD card, please open this definition in app_main.c 49 line

  // #define HAS_SDCARD       //If you have an SD card, please open this definition
  

• IO14 is connected to the SD card of the board, and the power of the LED controls the IO Pin. When you use the battery, you need to set IO14 to high level to use the SD card.