Connect your Ultrasonic sensor with any Arduino

1// defines pins numbers
2const int trigPin = 9;
3const int echoPin  = 8;
4
5// defines variables
6long duration;
7int distance;
8
9void  setup() {
10pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
11pinMode(echoPin,  INPUT); // Sets the echoPin as an Input
12Serial.begin(9600); // Starts the serial  communication
13}
14
15void loop() {
16// Clears the trigPin
17digitalWrite(trigPin,  LOW);
18delayMicroseconds(2);
19
20// Sets the trigPin on HIGH state for 10 micro  seconds
21digitalWrite(trigPin, HIGH);
22delayMicroseconds(10);
23digitalWrite(trigPin,  LOW);
24
25// Reads the echoPin, returns the sound wave travel time in microseconds
26duration  = pulseIn(echoPin, HIGH);
27
28// Calculating the distance
29distance= duration*0.034/2;
30
31//  Prints the distance on the Serial Monitor
32Serial.print("Distance: ");
33Serial.println(distance);
34}