ACS712 Measuring

acs712.ino

float current_amplitude;
float effective_reading;
float effective_voltage = 230; // Set voltage to 230V (Europe) or 110V (US)
float effective_power;
float zero_current_reading;

//in setup or initially
//Calibrating ACS by reading no current value
zero_current_reading = measureACSvalue(A0);


//in Loop
// Measure Effective Power
  float current_reading = measureACSvalue(A0);
    
  // Convert to current
  current_amplitude = (float)(current_reading-zero_current_reading)/1024*5/185*1000000;
  effective_reading = current_amplitude/1.414;
  effective_power = abs(effective_reading*effective_voltage/1000);
  ePpower = (int)effective_power;
  
  
// Measure the reading from the ACS712
float measureACSvalue(int pin)
{
  int sensorReading;
  float avgSensor = 0;
  int nb_measurements = 500;
  for (int i = 0; i < nb_measurements; i++) {
    sensorReading = analogRead(pin);
    avgSensor = avgSensor + float(sensorReading);
  }	  
  avgSensor = avgSensor/float(nb_measurements);
  return avgSensor;
}