ESP8266 Serial WIFI Module (ESP-07 – additional antenna connector)

ESP8266 Serial WIFI Module (ESP-07) is a new player in this field: it is small (25mm x 15mm), with simple pin connections, using TX/RX serial buffers to send and receive Ethernet buffers, and similarly, using serial commands to request and modify WiFi module configurations. This is very convenient because it requires only two wires (TX/RX) to communicate between a microcontroller and WiFi, but more importantly, it unloads WiFi-related tasks on the module, allowing the microcontroller code to be very light.