ESP8266 by Espressif Inc.

Description

ESP8266EX is among the most integrated Wi-Fi chips in the industry. Measuring just 5mm x 5mm, ESP8266EX requires minimal external circuitry and integrates a 32-bit Tensilica MCU, standard digital peripheral interfaces, antenna switches, RF balun, power amplifier, low noise receive amplifier, filters and power management modules - all in one small package.

The WiFi module hosts the ESP8266 SoC with an integrated TCP/IP protocol stack that can give any microcontroller access to a 802.11 b/g/n WiFi network.