water level detecting by arduino

gistfile1.txt

const int pingPin = A0;
//-------denoise----------------
int denoise[10];
int temp = 0;
//========================denoise


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

void loop()
{
  long duration;
  float cm;
  
  pinMode(pingPin,OUTPUT);
  digitalWrite(pingPin,LOW);
  delayMicroseconds(2);
  digitalWrite(pingPin,HIGH);
  delayMicroseconds(5);
  digitalWrite(pingPin,LOW);

  pinMode(pingPin, INPUT);
  duration = pulseIn(pingPin,HIGH);

  cm= microsecondsToCentimeters(duration);
  

  
  //-----denoise  
  for(int i = 0; i < 10; i++)
  {
    denoise[i] = cm;
  }
  
  for(int i = 0; i < 10 ; i++)
  {
    for(int j = 0; j< 10 - i; j++)
    {
      if(denoise[i] > denoise[i+1])
      {
        temp = denoise[i];
        denoise[i] = denoise[i+1];
        denoise[i+1] = temp;
      }
    }
  }
  
  cm = (denoise[4] + denoise[5]) / 2;
//============denoise

  
  Serial.println(cm,DEC);

  delay(100);
  
}

long microsecondsToInches(long microseconds)
{
  
  return microseconds / 74 / 2;
}

long microsecondsToCentimeters(long microseconds)
{

  return microseconds / 0.29 / 2;
}