NodeMcu is an ESP8266 based platform for creating various Internet of Things (IoT) devices. The module can send and receive information to a local network or to the Internet using WiFi. An inexpensive module is often used to create distance-controlled smart home systems or Arduino robots. In this article, we will look at the board description, version differences, and NodeMcu v3 pinout the latest version of the NodeMcu Esp8266 module . We will also briefly review the Lua language in which you need to write programs for NodeMcu.