Interfacing ultrasonic sensor with Arduino

1// Interfacing Ultrasonic sensor with Arduino uno
2
3
4#define echoPin  12 //connect echo pin of ultrasonic sensor to D12 of Arduino
5#define trigPin  10 //connect trigger pin of ultrasonic sensor to D10 of Arduino
6
7long duration;  // declare variables to hold duration and distance
8int distance;
9
10void  setup() //setup() is used for initialization
11
12{
13  Serial.begin(9600);  //set  the baud rate of serial communication to 9600
14  pinMode(trigPin,OUTPUT); //set  trigPin as output pin of Arduino
15  pinMode(echoPin,INPUT);  //set echoPin as  output pin of Arduino
16 }
17void loop(){
18  digitalWrite(trigPin,LOW); //generate  square wave at trigger pin
19  delayMicroseconds(2);
20  digitalWrite(trigPin,HIGH);
21  delayMicroseconds(10);
22  digitalWrite(trigPin,LOW);
23  
24 duration=pulseIn(echoPin,HIGH);//calculation  of distance of obstacle
25  distance=(duration*0.034/2);
26  Serial.print("Distance  : ");
27  Serial.print(distance);
28  Serial.println(" cm ");
29  delay(1000);
30               
31}
32

1// Interfacing Ultrasonic sensor with Arduino uno
2
3
4#define echoPin
5  12 //connect echo pin of ultrasonic sensor to D12 of Arduino
6#define trigPin
7  10 //connect trigger pin of ultrasonic sensor to D10 of Arduino
8
9long duration;
10  // declare variables to hold duration and distance
11int distance;
12
13void
14  setup() //setup() is used for initialization
15
16{
17  Serial.begin(9600);  //set
18  the baud rate of serial communication to 9600
19  pinMode(trigPin,OUTPUT); //set
20  trigPin as output pin of Arduino
21  pinMode(echoPin,INPUT);  //set echoPin as
22  output pin of Arduino
23 }
24void loop(){
25  digitalWrite(trigPin,LOW); //generate
26  square wave at trigger pin
27  delayMicroseconds(2);
28  digitalWrite(trigPin,HIGH);
29
30  delayMicroseconds(10);
31  digitalWrite(trigPin,LOW);
32  
33 duration=pulseIn(echoPin,HIGH);//calculation
34  of distance of obstacle
35  distance=(duration*0.034/2);
36  Serial.print("Distance
37  : ");
38  Serial.print(distance);
39  Serial.println(" cm ");
40  delay(1000);
41
42               
43}
44