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Arduino Uno WiFi (Developer Edition) Wiki

Arduino Uno WiFi Developer Edition is an Arduino UNO R3 with ESP8266 integrated on the board. It was developed and manufactured by Arduino.org. "Getting started" tutorial is now on the arduino.cc site.

ESP8266 is a ‘WiFi chip’ often used in combination with Arduino microcontrollers. Arduino Uno WiFi Developer Edition connects ATmega328 microcontroller to ESP8266 using additional on board UART chip SC16IS750 (here as module). This additional UART - Serial1 is connected to Atmega as I2C device.