Arduino measures AC current

 

  Is the software simple , Just two lines of code .

Be careful ： The baud rate of serial port should be as high as possible , Used here 2000000, To improve the sampling frequency .

The hardware is also simple , Any one has ADC For example UNO and One “ AC transformer module ”.

Be careful ： It is a module with operational amplifier （ Right ）, AC transformer （ Left ） Output is originally communication , Negative part of the MCU is not convenient to collect .

Why is the waveform on the diagram not a sine wave ？ This is the current waveform of a display , That's all right. , It has been verified by oscilloscope , Switching power supply is like this , Change to resistive load and you will see sine wave .