ESP8266 Serial Port WiFi Transceiver Module (ESP-05)

ESP8266 Serial WiFi Module (ESP-05) is a new player in this field: it?s tiny (25mm x 15mm), with simple pin connections (standard 2?4 pin headers), using serial TX/RX to send and receive Ethernet buffers, and similarly, using serial commands toquery and change configurations of the WiFi module. This is quite convenient as it only requires two wires (TX/RX) to communicate between a microcontroller and WiFi, but more importantly, it offloads WiFi-related tasks to the module, allowing the microcontroller code to be very light-weighted.