NodeMCU Lua V3 wifi based on ESP8266 Review

NodeMCU Lua V3 module based on ESP8266 chip. The USB-TTL converter is based on the CH340G chip. Processor 32-bit WiFi – 802.11 b/g/n Supply voltage 3.3 V External power supply 3.6–20 V Current consumption: data transfer mode – 200 mA, data reception mode – 60 mA Connection to a computer – microUSB input Has built-in flash memory 4 MB Support in the basic firmware of the Lua interpreter Possibility of updating the firmware via Wi-Fi Presence of a built-in temperature sensor What are the advantages of this board based on the ESP8266 module? Firstly, the board has a UART-USB interface with a micro USB connector, which allows you to connect it to a computer without adapters. Secondly, it has pins for all available ESP8266 pins. And these are 11 general purpose I/O ports, some of which have additional functions (see Figure 1). Figure 1. NodeMcu pin assignment Lua is an embeddable scripting language that is small, fast, and very powerful. Using Lua commands for NodeMCU, you can perform the following actions: use the board as a WiFi access point connect (including automatically) to a WiFi access point low power mode (go to sleep) redirect output perform operations with a list of files in flash memory control user timer and WatchDog timer control GPIO1 pins creation of a web server exchange data I2C devices read data on the ADC pin You can not only execute Lua commands in the terminal, but also create files in the ESP8266 flash memory and call them for execution. Consider examples of writing programs for the module in the Lua language, as well as in the Arduino IDE programming environment.