// Interfacing Ultrasonic sensor with Arduino uno


#define echoPin 5 //connect echo pin of ultrasonic sensor
#define trigPin 6 //connect trigger pin of ultrasonic sensor

long duration;  // declare variables to hold duration and distance
int distance;

void setup() //setup() is used for initialization

{
  Serial.begin(9600);  //set the baud rate of serial communication to 9600
  pinMode(trigPin,OUTPUT); //set trigPin as output pin of Arduino
  pinMode(echoPin,INPUT);  //set echoPin as output pin of Arduino
 }
void loop(){
  digitalWrite(trigPin,LOW); //generate square wave at trigger pin
  delayMicroseconds(4);
  digitalWrite(trigPin,HIGH);
  delayMicroseconds(15);
  digitalWrite(trigPin,LOW);
  
 duration=pulseIn(echoPin,HIGH);//calculation of distance of obstacle
  distance=(duration*0.034/2);
  Serial.print("Distance : ");
  Serial.print(distance);
  Serial.println(" cm ");
 delay(5000);
               
}