AC Current Measurement using Current Transformer and Arduino 

#include "EmonLib.h" // Include Emon Library EnergyMonitor emon1; // Create an instance int CT_pin = A1; // CT sensor pin connected to A5 pin of Arduino void setup() { Serial.begin(9600); emon1.current(CT_pin, 32.59); // Current: input pin, calibration. } void loop() { double Irms = emon1.calcIrms(1480); // Calculate Irms only // Serial.print(Irms*230.0); // Apparent power // Serial.print(" "); Serial.print(Irms); // Irms Serial.println(" mA"); }