ESP32CAM automatic downloader

        When using the ESP32 module, the purchased download module roughly pulls down IO0, making it impossible to debug the module through the serial port. You also need to manually press rst to reset, and it can only download the esp32-cam module, which has a single function.
With reference to the information on the Internet, the automatic download download module was implemented in Lichuang eda.
        This module completely cuts off power to the module through the MOS tube to achieve the restart function. At the same time, the flow control pin is used to control IO0 and module restart to realize the function of automatically downloading the program. The download port uses pins and can be used as an ordinary USB to serial port module. A more useful Type-C interface is used.
 
       Proofing has been verified, the download program is normal, and the restart button works normally!