Range Finder

1// Define Trig and Echo pin:
2#define trigPin 2
3#define echoPin 3
4//  Define variables:
5long duration;
6int distance;
7void setup() {
8  // Define  inputs and outputs:
9  pinMode(trigPin, OUTPUT);
10  pinMode(echoPin, INPUT);
11  //Begin Serial communication at a baudrate of 9600:
12  Serial.begin(9600);
13}
14void  loop() {
15  digitalWrite(trigPin, LOW);
16  delayMicroseconds(5);
17  digitalWrite(trigPin,  HIGH);
18  delayMicroseconds(10);
19  digitalWrite(trigPin, LOW);
20  // Read  the echoPin, pulseIn() returns the duration (length of the pulse) in microseconds:
21  duration = pulseIn(echoPin, HIGH);
22  // Calculate the distance:
23  distance=  duration*0.034/2;
24  // Print the distance on the Serial Monitor
25  Serial.print("Distance  = ");
26  Serial.print(distance);
27  Serial.println(" cm");
28  delay(1000);
29}
30

1// Define Trig and Echo pin:
2#define trigPin 2
3#define echoPin 3
4//
5  Define variables:
6long duration;
7int distance;
8void setup() {
9  // Define
10  inputs and outputs:
11  pinMode(trigPin, OUTPUT);
12  pinMode(echoPin, INPUT);
13
14  //Begin Serial communication at a baudrate of 9600:
15  Serial.begin(9600);
16}
17void
18  loop() {
19  digitalWrite(trigPin, LOW);
20  delayMicroseconds(5);
21  digitalWrite(trigPin,
22  HIGH);
23  delayMicroseconds(10);
24  digitalWrite(trigPin, LOW);
25  // Read
26  the echoPin, pulseIn() returns the duration (length of the pulse) in microseconds:
27
28  duration = pulseIn(echoPin, HIGH);
29  // Calculate the distance:
30  distance=
31  duration*0.034/2;
32  // Print the distance on the Serial Monitor
33  Serial.print("Distance
34  = ");
35  Serial.print(distance);
36  Serial.println(" cm");
37  delay(1000);
38}
39