ESP8266 is the new WIFI platform for Internet Of Things. This module is unbelievably cheap powerful.
ESP modules are available from ESP-1 to ESP12 .The GPIO pin count varies according to type.In this video ESP-01 module is used .This module can be used as an Access Point , as well as a Client.
https://alselectro.wordpress.com/2015/05/05/wifi-module-esp8266-1-getting-started-with-at-commands/
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