esp8266 D1 , it is a mini NodeMcu Lua WiFi board based on ESP-8266EX. 11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire. ESP8266 has I/O Pin. A great set of tools to develop ESP8266. Specification: Main Chip: ESP8266 CH340G. WIFI Development Board, 4M bytes. supported (except D0). Support OTA on line. 1 Micro USB connection. 1 analog input (3.3V max input). 5V 1A switching power supply onboard. 11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire and a micro-USB connection. How to get started: Setup driver: Before you use mini boards, you need setup CH340g driver. Python: On Windows you need install Python 2.7.10. On Linux & MAC OSX, you don't need install it, comes preinstalled with OS. Installing Hardware package: There is two ways to install hardware package, Boards Manager or GIT Installing with Boards Manager: Starting with 1.6.4, allows installation of third-party platform packages using Boards Manager. We have packages available for Windows, Mac OS, and Linux (32 and 64 bit). 1.Install Arduino 1.6.7 from the Arduino website. 2.Start board and open Preferences window. 3.Enter http://arduino.esp8266.com/stable/package_esp8266com_index.json into Additional Boards Manager URLs field. You can add multiple URLs, separating them with commas. 4.Open Tools?Board:xxx?Boards Manager and install esp8266 by ESP8266 Community (and don't forget to select your ESP8266 board from Tools > Board menu after installation). Installing with GIT (Recommend): We recommend using GIT to install Hardware package,you can always get the latest version of it. Package includes: 1 X Mini NodeMCU Lua Wifi Wireless Module

All I0 working levels are 3.3V and can withstand 5V instantly. Except DO, all IO supports interrupt, PWM, 12C and 1-wire. ESP8266 ESP-12F internet development board is nicely suitable for Arduino, and can be programmed for Arduino IDE and support OTA online. ESP8266 has 11 digital input/output pins and 1 analog pin. All pins except D0 support interrupt/PWM/I2C/single-wire functions. Wemos d1 WIFI development board on-board 5V 1A switching power supply, 4 MBit flash memory and an integrated chip card for ESP8266. ESP8266 mini with a small and convenient size, this development board based on ESP-12F ESP8266, can help your project save space.