Download Board Esp8266 Arduino ^hot^ Instant

Tip: If you already have other URLs (like for the ESP32), separate them with a comma. Click to save. 2. Download and Install ESP8266 Boards

To start developing with the ESP8266, you need to integrate its board definitions into the Arduino IDE, as it does not include support for these third-party microcontrollers by default.

Navigate to (on macOS, use Arduino > Preferences ). Locate the field labeled "Additional Boards Manager URLs" .

Paste the following official stable release URL: http://arduino.esp8266.com/stable/package_esp8266com_index.json