ESP-12E WeMos D1 UNOs R3 CH340 CH340G WiFi Development Board Based ESP8266 Shield Smart Electronic For Arduinos Compatible IDE
 
The WeMos D1 is a ESP8266 WiFi based board that uses the Arduino layout with a operating voltage of 3.3V. As the documentation of this board online can be a little confusing, the purpose of this tutorial is to combine and simplify the steps needed to setup this board for development. With that, let’s proceed on with the specifications of the board.
 
This board is compatible with the Arduino IDE and with NodeMCU. 
 
SPECIFICATIONS:
Microcontroller: ESP8266EX
Operating Voltage: 3.3V
Digital I/O Pins: 11 (all I/O pins have interrupt/pwm/I2C/one-wire capability, except for D0)
Analog Input Pins: 1
Flash Memory: 4MB
On-Board Switching Power Supply:
Input Voltage Range: 9V to 12V
Output: 5V at 1A Max
Board Dimensions: 68.6mm x 53.4mm (2.701" x 2.102") / Long x Wide
 
Resources:
1.  Getting started with the WeMos D1 ESP8266 WiFi Board
2. How to Use Arduino WeMos D1 WiFi UNO ESP8266 IOT IDE Compatible Board by Using Blynk
3. How to connect WeMos D1 Mini based on ESP-12F ESP8266 to ThingsBoard