Environment-
single phase supply
2 schmitt triggers (converts a sine wave into square wave)
8051 microcontroller

Objective-
to find the phase difference between voltage and current

Steps targeted-
1. provide 8051 with 2 square waveforms( one of voltage and other of CURRENT )
2. program 8051 suitably (using timers of 8051) to compute the phase differnce between the square waves which results into desired objective

Problem-
from where to get this CURRENT waveform..?
(please see the attached figure)