const int pingTrigPin = A4; //Trigger connected to PIN 7  
  const int pingEchoPin = A5; //Echo connected yo PIN 8  
  int buz=13; //Buzzer to PIN 4  
  int buz1=9;
  void setup() {  
  Serial.begin(9600);  
  pinMode(buz, OUTPUT);  
  pinMode(buz1, OUTPUT);  
  }  
  void loop()  
  {  
  long duration, cm;  
  pinMode(pingTrigPin, OUTPUT);  
  digitalWrite(pingTrigPin, LOW);  
  delayMicroseconds(2);  
  digitalWrite(pingTrigPin, HIGH);  
  delayMicroseconds(5);  
  digitalWrite(pingTrigPin, LOW);  
  pinMode(pingEchoPin, INPUT);  




  duration = pulseIn(pingEchoPin, HIGH);  
  cm = microsecondsToCentimeters(duration);  
  if(cm<=200 && cm>0)  
{  
  int d= map(cm, 1, 100, 20, 2000);  
  digitalWrite(buz, HIGH);  
  digitalWrite(buz1, HIGH);  
  delay(50);  
  digitalWrite(buz, LOW);  
  digitalWrite(buz1, LOW);  
  delay(d);  
  }  
  Serial.print(cm);    
  Serial.print("cm");  
  Serial.println();  
  delay(40);  
  }  
  long microsecondsToCentimeters(long microseconds)  
  {  
  return microseconds / 29 / 2;  
  }