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Hi,

This is my first post ever and I am new to electrical engineering but I a little bit understand the basics.

I have connected direct  ac from 230volt - to - 5volt output of transformer to arduino uno analog  pin A0 and we are varying the voltage using ac dimmer.

have used following code for testing. Code compiles and uploads properly to Arduino. Arduino serial monitor shows 239 as value for 4 volt input ac.

Kindly help.

// EmonLibrary examples openenergymonitor.org, Licence GNU GPL V3 
#include "EmonLib.h" // Include Emon Library 
EnergyMonitor emon1; // Create an instance 

void setup() 
{ 
  Serial.begin(9600); 
  emon1.voltage(2, 234.26, 1.7); // Voltage: input pin, calibration, phase_shift 
} 

void loop() 
{ 
  emon1.calcVI(20,2000); // Calculate all. No.of half wavelengths (crossings), time-out
  emon1.serialprint(); // Print out all variables (realpower, apparent power, 
                           Vrms, Irms, power factor) 
  float supplyVoltage = emon1.Vrms; //extract Vrms into Variable 
};