ITEM NAME:D1 Mini NodeMcu 4M bytes Lua WIFI Development Board ESP8266 by WeMos!c.Open Tools→Board:xxx→Boards Manager and install esp8266 by ESP8266. This is D1 mini, it is a mini WIFI board based on ESP-8266EX. Start Arduino and open Preferences window. 11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire.
