WeMos D1 WiFi UNO Development Board Based ESP8266 For Arduino
•based on the ESP-8266EX.
•Ard uino Compatible, you can use it on Ard uino IDE.
•11 Digital I/O pins
•1 Analog Input pin
•OTA — Wireless Upload(Program)
•On board switching power supply — Max 24V input, 5V 1A output
WEMOS D1 is a WIFI development board based on ESP8266 12E. The functioning is similar to that of NODEMCU , except that the hardware is built resembling Arduino UNO.
The D1 board can be configured to work on Arduino environment using BOARDS MANAGER.
So,its not necessary to use a separate Arduino board , the D1 itself can be programmed on Arduino IDE.This is handy in using with IOT projects. Further many Arduino SHIELDs are compatible with the D1 board.
Different versions of D1 boards are available in the market R1 , R2 , MINI
As the name implies D1 Mini is a smaller version
R1 , R2 boards look like Arduino UNO board ,but version is not printed on board. On some boards WEMOS D1is printed , as the ESP12 chip is manufactured by WEMOS.
In some other boards it is printed just D1 ,where the ESP12 chip is that of AI Thinker.
As the ESP12 chip has only one ANALOG pin , on board there is only A0 & other analog pins are dummy .