The Espressif ESP8266 is a low-cost, high-performance wireless SOC that provides endless possibilities for integrating WiFi functionality into other systems.
It can control input and output like Arduino, but the special thing is that it contains a built-in WiFi adapter.
Occured problem with modules fitted by the CH340 chip. This chip serves as a converter between serial interface and USB.
Very often we can meet this chip on Chinese-made modules, in my case it is quite regularly on products based on popular ESPxx processors from Espressif Systems company.
One of the most used personal computer interfaces for connecting other devices is the serial interface. Modern computers contain at most one serial port, while laptops do not have a single one, due to the robustness of the classic RS232 connector. Therefore, a popular solution for equipping a computer with a serial interface is a serial port to USB interface adapter.
This solution offers the flexibility of the electrical parameters of the serial input, output, compared to the standard RS232 interface, where the level of electrical signals ranges from -15V to +15V.
With modules equipped with the CH340 chip. This chip serves as a converter between the serial interface and USB.
Very often we can encounter this chip on modules of Chinese manufacture; in my case, it is quite regularly on products based on popular processors from the company Espressif Systems ESPxx.