WeMos D1 R2 WiFi ESP8266 Development Board Compatible Arduino UNO Program By Arduino IDE
Since 2016.11th.Jan ， this product will update to a new version， named: WeMos D1 R2. (If you buy it before 2016.11th.Jan ， the board is still the old version)Since 2016.25th.Jan， We have the new version : WeMos D1 R2 in US warehouse. (If you buy it before 2016.25th.Jan ， the board is still the old version)
The D1 R2 is a mini wifi board based on ESP-8266EX.

11 digital input\/output pins， all pins have interrupt\/pwm\/I2C\/one-wire supported(except D0)
1 analog input(3.3V max input)
A Micro USB connection
A power jack， 9-24V power input.
Compatible withArduino
Compatible with nodemcu Getting Started Arduino Getting Started NodeMcu Getting Started
Technical specs: Microcontroller ESP-8266EX Operating Voltage 3.3V Digital I\/O Pins 11 Analog Input Pins 1 Clock Speed 80MHz\/160MHz FLash 4M bytes Length 68.6mm Width 53.4mm Weight 25g Pin Function ESP-8266 Pin TX TXD TXD RX RXD RXD A0 Analog input， max 3.3V input A0 D0 IO GPIO16 D1 IO， SCL GPIO5 D2 IO， SDA GPIO4 D3 IO，Pull-up GPIO0 D4 IO，pull-up， BUILTIN_LED GPIO2 D5 IO， SCK GPIO14 D6 IO， MISO GPIO12 D7 IO， MOSI GPIO13 D8 IO，pull-down， SS GPIO15 G Gound GND 5V 5V - 3V3 3.3V 3.3V RST Reset RST *All IO have interrupt\/pwm\/I2C\/one-wire supported(except D0) Programming: The D1 R2 has a micro USB for auto programming. Also you can programming it using OTA Warnings: All IO is work at 3.3V.
Package included:
1 x WeMos D1 R2 WiFi ESP8266 Development Board Compatible Arduino UNO Program By Arduino IDE