EMF Detection

#define sample 300                   

int inPin = 5;                                  
int val;                                        
int speaker = 13;                              

int array1[sample];                     
unsigned long averaging;        

void setup() 
{ 
  Serial.begin(9600);
}

void loop() 
{                   
  for(int i = 0; i < sample; i++)
  {              
    array1[i] = analogRead(inPin);       
    averaging += array1[i];                      
  }                                                              

  val = averaging / sample;                   

  val = constrain(val, 0, 100);               
  val = map(val, 0, 100, 0, 200);     

  if(val < 6)
  {
    val = 0; 
  }
  
  analogWrite(speaker,val);     
  averaging = 0;                                 
}