WeMos D1 Mini Pro is a very small and low-cost yet capable development board based on the popular ESP8266 WiFi chip. If you are familiar with Arduinos, uploading a program to this board is very similar. You can even use Arduino IDE for it. Alternatively, it also NodeMCU firmware.
This board has breadboard friendly but unpopulated I/O headers on the sides. Three types of different header pins are included in the package so that you can choose and solder them which ever way that suit your need. There is a micro USB connector for both power and program loading.
There are various shields (also known as add-on boards) developed for this D1 Mini Pro to add more functionality to the board. This includes sensors like temperature and humidity sensor, OLED display, relays and many more.
All in all, this board is great for IoT application since it supports WiFi connectivity, low-powered and cost effective.
