sct 013

Other Hardware Motors, Mechanics, Power and CNC
1

i m trying to use sct 013 to calculate the curent consumption as in this project;

https://learn.openenergymonitor.org/electricity-monitoring/ct-sensors/how-to-build-an-arduino-energy-monitor-measuring-current-only
and i put this code in my arduino uno

#include "EmonLib.h"             // Include Emon Library
#define CURRENT_CAL 40
EnergyMonitor emon1;             // Create an instance

void setup()
{  
  Serial.begin(9600);
  emon1.current(0, CURRENT_CAL);       // Current: input pin, calibration.
}

void loop()
{
  emon1.calcVI(20,700);         // Calculate all. No.of half wavelengths (crossings), time-out
  float currentDraw            = emon1.Irms;             //extract Irms into Variable
  Serial.println(supplyVoltage);*/
  Serial.print("Current: ");
  Serial.println(currentDraw);


}

after i do my calibration i use the power consumption of my pc (0.20/0.30 A) i can get the values correctly
but i have a problem with a spike in value that dont show up on my kilawattmeter.
and the second problem is when i add more power consumption the values differ between the kilawattmeter and the sensor.