float get_current(int mode)
{
  int input;
  switch (mode){
    case 1:input=A1; break;
    case 2:input=A2; break;
    case 3:input=A3;break;
}
  float voltageSensor;
  float current=0;
  float sum=0;
  long waktu = millis();
  int N=0;
  while(millis()-waktu<500)//Durasi 0,5 detik (Sekitar 30 siklus 60Hz)
  {
    voltageSensor = analogRead(input) * (1.1 / 1023.0);//voltage sensor
    current=voltageSensor*30.0;
    sum=sum+sq(current);//jumlah kuadrat
    N=N+1;
    delay(1);
  }
  sum=sum*2;//Untuk mengimbangi kuadrat setengah siklus negatif.
  current=sqrt((sum)/N); //persamaan RMS
 return(current);
}