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The WeMos D1 R2 Uno based ESP8266 is a wireless 802.11 (Wifi) microcontroller development board is compatible with the Arduino IDE. It turns the very popular ESP8266 wireless (WiFi) module into a fully-fledged development board. The layout of this board is based on a standard Arduino hardware design with similar proportions to the Arduino Uno and Leonardo. It also includes a set of standard Arduino headers which means many existing Arduino shields can be plugged directly into the board.
The development board also includes a CH340 USB to serial interface giving it the ability to be connected and programmed directly from your computer and requiring only a common micro USB cable – no additional interface hardware or configuration is required. Once connected to the computer, and drivers have been installed, the WeMos D1 will appear as a standard serial COM port. The WeMos D1 can be programmed directly from the Arduino Integrated Development Environment.
WeMos D1 R2 WiFi ESP8266 is a Wi-Fi enabled Arduino compatible board based on the ESP8266 chip. The board can be programmed with Arduino or Lua, and supports both serial and OTA programming. The Arduino-UNO look-alike board is built on the ESP8266EX 32 bit RISC micro-controller powered at 3.3V (so all the I/O is also 3.3V!) and running at 80MHz. It has a full WiFi transceiver and contains 64KB of instruction RAM, 96KB of data RAM and 4MB flash memory.
WeMos D1 R2 WiFi ESP8266 Development Board