Parking Sensor with Arduino

1
2#include <Ultrasonic.h>
3Ultrasonic ultrasonic(6,5);// 6 trig ,
4  5 echo
5
6
7const int buzzer = 7; // pin buzzer
8
9void setup(){
10 pinMode(buzzer,OUTPUT);
11
12}
13
14void
15  loop(){
16 int dist = ultrasonic.Ranging(CM);
17if (dist < 100) {
18  tone(buzzer,1000);
19
20     delay(40);
21   noTone(buzzer);
22     delay(dist*4);
23   }
24 delay(100);
25  
26} 
27