int uzaklik = 0;
int sure=0;
int cm = 0;

long readUltrasonicDistance(int triggerPin, int echoPin)
{
  pinMode(triggerPin, OUTPUT);  // Clear the trigger
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  // Sets the trigger pin to HIGH state for 10 microseconds
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  pinMode(echoPin, INPUT);
  // Reads the echo pin, and returns the sound wave travel time in microseconds
  return pulseIn(echoPin, HIGH);
}

void setup()
{
  Serial.begin(9600);
  pinMode(3, OUTPUT);
}

void loop()
{
  cm = 0.01723 * readUltrasonicDistance(5, 4);
  sure=cm*10;
  Serial.println(cm);
  if (cm <= 100) {
    tone(3,500,100);
    delay(cm*10);
    noTone(3);
    delay(cm*10);
  } 
  else {
    if (cm > 100 && cm <= 200) {
    tone(3,250 ,100);
    delay(cm*10);
    noTone(3);
    delay(cm*10);
    } 
  else {
    tone(3, 100,100);
    delay(cm*10);
    noTone(3);
    delay(cm*10);
    }
  }
}