Distance measurement using HCSR04

1#define trigPin 10
2#define echoPin 11
3
4void setup() 
5{
6  Serial.begin (9600);
7  pinMode(trigPin, OUTPUT);
8  pinMode(echoPin, INPUT);
9}
10
11void  loop() 
12{
13  long duration, distance;
14  digitalWrite(trigPin, LOW);        
15  delayMicroseconds(2);              
16  digitalWrite(trigPin, HIGH);
17  delayMicroseconds(10);           
18  digitalWrite(trigPin, LOW);
19  duration = pulseIn(echoPin, HIGH);
20  distance = (duration/2) / 29.1;
21  if (distance >= 200 || distance <= 0)
22  {
23    Serial.println("Out of range");
24  }
25  else 
26  {
27    Serial.print(distance);
28    Serial.println(" cm");
29  }
30  delay(500);
31}
32

1#define trigPin 10
2#define echoPin 11
3
4void setup() 
5{
6
7  Serial.begin (9600);
8  pinMode(trigPin, OUTPUT);
9  pinMode(echoPin, INPUT);
10}
11
12void
13  loop() 
14{
15  long duration, distance;
16  digitalWrite(trigPin, LOW);        
17
18  delayMicroseconds(2);              
19  digitalWrite(trigPin, HIGH);
20  delayMicroseconds(10);
21           
22  digitalWrite(trigPin, LOW);
23  duration = pulseIn(echoPin, HIGH);
24
25  distance = (duration/2) / 29.1;
26  if (distance >= 200 || distance <= 0)
27
28  {
29    Serial.println("Out of range");
30  }
31  else 
32  {
33    Serial.print(distance);
34
35    Serial.println(" cm");
36  }
37  delay(500);
38}
39