Boards Compatible with Arduino UNO Based ESP8266 Nodemcu Development Board

The ESP8266 is an extremely popular microcontroller similar to ARDUINO UNO with built-in WiFi. Typical ESP8266 ESP-12 boards do not have a convenient power or programming connection. It requires you to figure out how to supply 3.3V and more before you can work with them. These boards take care of that and break out the pins to the ubiquitous  pattern so that you can use DuPont cables directly and can even use some UNO Shields (provided that the shield is compatible with the pin layout, voltage, etc.).