// Connect Hall effect sensor to pin A0

int gauss_int;

void setup(){
  // Set serial monitor baud rate
  Serial.begin(9600);
}   

void loop(){

  double gauss = 0.0; // a double to hold the measured field

  // Now measure "NAVE" samples and average them
  int NAVE = 5000; 
  
  for(int iii = 0; iii<NAVE; ++iii){
    
    int val =analogRead(0);
    gauss_int = map(val, 102, 922, -640, 640);
    gauss     += (1.0*gauss_int)/(1.0*NAVE); // Compute double (gauss_int / NAVE would round off! Multiply by 1.0 as to convert to double!)
    
  }

  Serial.print(gauss);
  Serial.println(" [Gs]");
  delay(100);
}