Learning AWS IoT
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IoT boards based on ESP8266 MCU

ESP8266 is a low-cost Wi-Fi MCU with full TCP/IP support. It's built by Espressif, a Chinese manufacturer. For further information about this chip, refer to http://espressif.com/en/products/hardware/esp8266ex/overview.

There are many boards based on the ESP8266 chip. The following is a list of board platforms built on top of ESP8266 MCU:

If you're interested in the ESP8266 chip, I recommend that you join  the ESP8266 forum at http://www.esp8266.com.

Although NodeMCU v2 and SparkFun ESP8266 Thing boards have the same chip, their chip model is different. NodeMCU v2 uses the ESP8266 module. On the other hand,  the SparkFun ESP8266 Thing board uses the ESP8266EX chip. In addition, the SparkFun ESP8266 Thing board provides a LiPo connector, which you can attach to an external battery: