ESP8266 WiFi Module (ESP-01S)

The ESP8266 WiFi Module allows you to add Internet connectivity to your next electronic project. It has a built-in TCP/IP protocol stack. AT commands are issued over UART. Fully Arduino friendly.

Features:

• 3.3V Operating Voltage
• 802.11 b/g/n
• Wi-Fi Direct (P2P), soft-AP
• Integrated TCP/IP protocol stack
• Integrated low power 32-bit CPU could be used as application processor
• SDIO 1.1 / 2.0, SPI, UART
• Arduino compatible library

AT Command Set:

//cdn.sparkfun.com/datasheets/Wireless/WiFi/Command%20Doc.pdf