ITEM NAME:D1 Mini NodeMcu 4M bytes Lua WIFI Development Board ESP8266 by WeMos XMQ.D1 Mini ESP8266 Wifi NodeMcu Lua. This is D1 mini, it is a mini WIFI board based on ESP-8266EX. Before you use mini Boards, you need setup CH340g driver. We'd like to settle any problem in a friendly manner.