The ESP8266 has been popular for quite a while now. The low cost of getting a module coupled with its power and reliability has made sales of the chip shoot through the roof. There's a lot of resources out there, but I wanted to combine all that information together into one place. The ESP8266 was designed by a Chinese fabless semiconductor company called Espressif. Fabless means they just create the chip design, and they get another company to actually manufacture the silicon (Atmel was also a fabless semiconductor company). While having Wi-fi on-chip with a microcontroller was not a new idea, the concept having a simple serial link to control it out of the box was. Hobbyists all over the world started playing with the chip to see what it could do.

Without having to program the ESP, complex IoT applications could be developed, using the ESP simply as an external Wi-fi chip. This is the easiest method for those who don't have interest in diving into the ESP itself.

You can use AT commands over a serial link to control the chip. This is the only way to control the ESP modules which only have 8 pins. A full list of the AT command set can be found here. This is a perfectly acceptable solution for many hackers, and if that's all you need then great! I built a data-logging module which used the Sparkfun phant server as the backend using only AT commands. Getting it connected to my Wi-fi network and sending data was very easy. However, many of you are here because you want to dive deep down into the power at the heart of the ESP8266. You want to program the module using Arduino or the SDK.

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