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The most basic way to use the ESP8266 module is to use serial commands, as the chip is basically a WiFi/Serial
transceiver. However, this is not convenient. What we recommend is using the very cool Arduino ESP8266 project,
which is a modified version of the Arduino IDE that you need to install on your computer. This makes it very
convenient to use the ESP8266 chip as we will be using the well-known Arduino IDE. Following the below step to
install ESP8266 library to work in Arduino IDE environment.
Install the Arduino IDE 1.6.4 or greater
Install the ESP8266 Board Package
http://arduino.esp8266.com/stable/package_esp8266com_index.json
into
Additional Board Manager URLs
field in the Arduino v1.6.4+ preferences.
Click ‘File’ -> ‘Preferences’ to access this panel.
Next, use the Board manager to install the ESP8266 package.