Arduino Interfacing With Ultrasonic Sensor (HC-SR04)

Circuit Diagram :-

Code:-

const int trigPin = 4;

const int echoPin = 5;

long duration;

int distance;

void setup()

{

  pinMode(trigPin, OUTPUT);

  pinMode(echoPin, INPUT);

  Serial.begin(9600);

  

}

void loop()

{

  digitalWrite(trigPin,LOW);

  delayMicroseconds(1);

  digitalWrite(trigPin,HIGH);

  delayMicroseconds(20);

  digitalWrite(trigPin,LOW);

  

 // Reads the echopin, returns the sound wave travel time in microseconds

 duration = pulseIn(echoPin,HIGH);

 // Calculation of distance

 distance = duration*0.034/2;

//prints the distance on serial Monitor 

Serial.print("Distance:");

Serial.println(distance);

delay(500);

}