how to measure home ac current 110v / 200v with arduino

The cool thing about an ACS712 is that current is measured is measured in two directions.  What this means is that if we sample fast enough and long enough,  we sure to find the peak in one direction and the peak in another direction. With both peaks known, it is a matter of knowing the shape of the waveform to calculate the current.   In the case of line or mains power, we know that waveform to be a SINE w ...

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