WemosDi ESP8266-12E Arduino Uno Compatible Wifi Proto Shield
The D1 contains the popular ESP8266 ESP-12E WiFi-enabled micro-controller on an Arduino Uno-compatible board.You can easily use the Arduino IDE, NodeMCU, BASIC or other environments to build your own "Internet of Things" IOT projects in no time at all. A full USB interface is on-board, along with a switch-mode power supply that accepts voltages between 7 and 24V into the DC socket, and gives your board a solid 5V at 1A. Note that the ESP8266 itself is a 3.3V part and all I/O used 3.3V. All of the pin-outs are neatly labeled and you can add your own circuitry easily with an Arduino Uno-compatible proto shield.