Wireless serial port downloader

The wireless serial port made by ESP8266 can realize remote serial communication.
There are power control pins that can automatically download certain microcontroller programs that require power-off and cold start. (For example, Hongjing STC series)
No equipment is required on the computer side, just install a virtual serial port software.
 
 
Program: https://github.com/gavin9399/WiFi_UART
 
Virtual serial port: https://www.usr.cn/download/31.html
 
When used, connect 5V and GND for power supply, TX and RX are connected to the target board (note the cross connection) , the two can communicate if they share the same ground.
If the target microcontroller wants to be programmed automatically, the target microcontroller must be powered by this downloader and connected to the "5V" (or "3V") and "-" terminals.
After powering on for the first time, you can search for the WiFi signal of "ESP_XXXX". After connecting, the browser will open "192.168.4.1", which can be changed to connect to the router.
In the settings page, you can also set the baud rate and parity bit of the serial port. STC microcontroller download requires even parity "E", and other communications do not need to change the parity to "N".
 
When creating a virtual serial port on the computer, ESP8266 is the server and the port number is 23.