How to install Esp8266 library in arduino
To program NodeMCU in Arduino IDE, we have to install esp8266 board (ESP8266 core for Arduino) to Arduino IDE.
Add Additional Board Manager URL for ESP8266 board:
> File > Preference
Add “http://arduino.esp8266.com/stable/package_esp8266com_index.json” in Additional Board Manager URLs.
Add ESP8266 board to Arduino IDE:
– Open Boards Manager in Arduino IDE
– Search “esp8266” or “NodeMCU”, you will find “esp8266 by ESP8266 Community”. Install it.