DIY Device that Monitors the Power Grid of the Entire Country

This is the video how I built this device: https://youtu.be/diqaiXGB9Js

This is the final curcuit:

Components

ESP8266: https://s.click.aliexpress.com/e/_97j7kp

Display SSD1306 https://s.click.aliexpress.com/e/_c4Ci1fiP

Optocoupler PC817: https://s.click.aliexpress.com/e/_Dnbd5jn

5V Power Supply: https://s.click.aliexpress.com/e/_DEBljk9

Other usefull components for this project:

Ceramic Capacitors: https://s.click.aliexpress.com/e/_ABg3GZ

Resistors: https://s.click.aliexpress.com/e/_9AslPB

Pin Header: https://s.click.aliexpress.com/e/_AUvLzT

Female PCB Header: https://s.click.aliexpress.com/e/_AClQip