The wemos d1 r2 wifi esp8266 is 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 to an Arduino Uno. This board is compatible with the Arduino IDE and with NodeMCU. The D1 R2 also features an onboard switching power supply which allows you to power the board from a power supply up to 12V.
