Beeping_Proximity_Sensor

1const int trigPin = 9;
2const int echoPin = 10;
3int buzzpin=7;
4
5long  duration;
6int distance;
7
8void setup() 
9{
10pinMode(trigPin, OUTPUT);
11pinMode(echoPin,  INPUT);
12pinMode(buzzpin, OUTPUT);
13Serial.begin(9600);
14}
15
16void loop()  
17{
18  digitalWrite(trigPin, LOW);
19  delayMicroseconds(2);
20  
21  digitalWrite(trigPin,  HIGH);
22  delayMicroseconds(10);
23  
24  digitalWrite(trigPin, LOW);
25  
26  duration = pulseIn(echoPin, HIGH);
27  distance= duration*0.034/2;
28  
29  
30  Serial.println(distance);
31  
32  delay(100);
33
34  
35 if(distance  <= 40 && distance >30)
36 {
37 digitalWrite(buzzpin, HIGH);
38   delay(2000);
39   digitalWrite(buzzpin, LOW);
40   delay(2000);
41 }
42 if(distance <= 30 &&  distance>20)
43 {
44 digitalWrite(buzzpin, HIGH);
45   delay(500);
46   digitalWrite(buzzpin,  LOW);
47   delay(500);
48 }
49  if(distance <= 20 && distance> 10)
50 {
51  digitalWrite(buzzpin, HIGH);
52   delay(50);
53   digitalWrite(buzzpin, LOW);
54   delay(50);
55 }
56 if(distance <= 10)
57 {
58 digitalWrite(buzzpin, HIGH);
59  }
60 if(distance>40)
61 {
62 digitalWrite(buzzpin, LOW);
63 }
64}