WeMos D1 R1 WiFi ESP8266 Board

QUICK OVERVIEW

WeMos-D1R1 IoT development board is an ESP8266-12 based WiFi enabled microprocessor unit on a Arduino-UNO footprint. That means the board looks and works (in most cases) like an UNO. Apparently several shields, sensors and output devices that are manufactured for the Arduino platform will work on the WeMos-D1R1 with the added advantage of builtin WiFi.