1/5/15PCS WeMos D1 Mini WiFi Development Board ESP8266 ESP12 NodeMcu Lua
Open Tools→Board:xxx→Boards Manager and install esp8266 by ESP8266. ESP8266 has I/O Pin. A great set of tools to develop ESP8266. D1 mini, it is a mini NodeMcu Lua WiFi board based on ESP-8266EX. 1/5/15 x Mini NodeMCU Lua Wifi Wireless Module.