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This is WeMos D1 R2 V2.1.0 WiFi ESP8266 Development Board Arduino UNO Compatible. The WeMos D1 is an ESP8266 WiFi based board that uses the Arduino layout with an operating voltage of 3.3V,  the board is controlled by the ESP8266 chip (a 32-Bit processor) and has a larger flash memory compared ..

Latest version 3.0.0. Wemos D1 mini is like a "little Arduino with wifi" for a great price. It's based around the ESP8266, has one analog port and 11 digital ports. It's programmed via micro-USB (or remote flash via wifi). You can use it with the Arduino IDE, micropython or NodeMCU.It..