#define echoPin                                            \
    2 
#define trigPin                                            \
    3                                   \


long duration;
               

int distance; 
              

void setup()
{
    pinMode(trigPin,
            OUTPUT); 
    pinMode(echoPin, INPUT); 

    
    Serial.begin(9600);

    
    Serial.println(
        "Distance measurement using Arduino Uno.");
    delay(500);
}

void loop()
{
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2); 
                          

    digitalWrite(
        trigPin,
        HIGH); 
    delayMicroseconds(
        10); 
             

    digitalWrite(trigPin,
                 LOW); 
                       

   

    duration = pulseIn(echoPin, HIGH);
    distance
        = duration * 0.0344 / 2; // Expression to calculate
                                 // distance using time

    Serial.print("Distance: ");
    Serial.print(
        distance); // Print the output in serial monitor
    Serial.println(" cm");
    delay(100);
}