Our growing ranks of hardware hackers have been excited by the ESP8266 Wi-Fi microcontroller. Rather than a specific technology innovation, it is the combination of low price point and small form factor that has sparked an inflection point in people's thinking about what is now feasible to achieve with custom hardware devices. Its main characteristics are: Wi-Fi capabilities (it can act as station, access point or a combination of both), low power, open hardware, Arduino SDK programmability, Lua programmability, huge community support and low cost compared with other IoT modules.