Using arduino & LM324N & current-voltage transformer to safely collect hurge AC current

Using Module

Current transformer: 50V/1V rms

Display Output module

Chinese make MAX7219 4-in-one Matrix display

Pin

    Max7219 - VCC - 5V
    Max7219 - GND - GND
    Max7219 - DIN - MOSI (11)
    Max7219 - CLK - SCK  (13)
    Max7219 - CS  - 10
    LM324N  - Out1 - A1

Diagram

Video Demo

https://www.bilibili.com/video/av56146612