D1 Mini Nodemcu Lua WIFI Expansion Board Support OTA Launch Internet Development Board for Arduino Compatible with WeMos D1 Mini. The WiFi Development Board is D1 mini, which is a mini NodeMcu Lua WiFi board based on ESP-8266EX. It has 11 digital input/output pins, all of which have interrupts/PWM/I2C/support for 1 wire, and 1 analog input. The board is compatible with Arduino and can be programmed in an Arduino IDE compatible environment.