SunRobotics ESP8266 Wifi Serial Module ESP-12F For IOT & WEB Micro Controller Board Electronic Hobby Kit

The ESP8266 WiFi Module sort of snuck up on the hacker community item. It looks promising... it's costed nicely... it seems it should be capable... and all the reviews are in - it is a nice little wifi / microcontroller / Arduino-clone sort of device! Formally, it's a system-on-a-chip (SOC) that has a TCP/IP stack built in. It's sort taking a wifi controller and squeezing out the extra pins and processing power as a pretty capable Arduino-compatible microcontroller. The ESP8266 can manage all wifi networking, or pass that onto another processor to do. As it is, it come preloaded with an AT command set, so you can use any microcontroller to set all necessary communication parameters through simple serial connections. To manage this wifi magic, the ESP8266 uses an 80MHz 32-bit processor, with power to spare to drive other functions besides Wifi. It offers 16 GPIO pins, 64kB instruction RAM and 96kB of data RAM besides the 4MB external flash. This means there's little more you have to add to it to have the ESP8266 monitor sensors and toggle I/O lines (using 3.3V logic levels).