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ESP8266 WiFi
The ESP8266 is the name of a micro controller designed by Espressif Systems. The
ESP8266 itself is a self-contained WiFi networking solution offering as a bridge from
existing micro controller to WiFi and is also capable of running self-contained applications.
This module comes with a built in USB connector and a rich assortment of pin-outs. With a
micro USB cable, you can connect NodeMCU devkit to your laptop and flash it without any
trouble, just like Arduino. It is also immediately breadboard friendly.