SoC – Expressif ESP8266EX Tensilica Xtensa LX106 processor 80 MHz.Digital I/O pins – 14, with 6 PWM and UART. MCU – Atmel ATmega328 8-bit AVR MCU 16 MHz with 32 KB flash Memory, 2KB SRAM, 1KB EEPROM.The datasheet of Arduino UNO WIFI is available here. (Or the device can act as an access point.) One useful feature of Uno Wi-Fi is support for OTA (over-the-air) programming, either for transfer of Arduino sketches or Wi-Fi firmware. The ESP8266 Wi-Fi Module is a self contained SoC with integrated TCP/IP protocol stack that can give access to your Wi-Fi network. It contains everything needed to support the microcontroller simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, and a reset button. The Arduino Uno Wi-Fi is the same as an Arduino Uno Rev3 but with an integrated Wi-Fi module! The board is based on the ATmega328P with an ESP8266 Wi-Fi Module integrated (datasheet).
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