// Experiment 3 : Interface Ultrasonic Sensor 
#include <Arduino.h>  // The Arduino core library

// Define pin constants
int TRIGGER_PIN =6;  // Digital output pin for the sensor's trigger
 int ECHO_PIN = 5;     // Digital input pin for the sensor's echo

 // Define constants for speed of sound in air (in meters per second)
 const float SPEED_OF_SOUND = 343.0;

 void setup() {
   // Initialize serial communication
     Serial.begin(9600);

       // Define trigger pin as an output and echo pin as an input
         pinMode(TRIGGER_PIN, OUTPUT);
           pinMode(ECHO_PIN, INPUT);
             pinMode(10, INPUT);
             }

             void loop() {
               // Generate a 10us pulse on the trigger pin to start the measurement
                 digitalWrite(TRIGGER_PIN, LOW);
                   delayMicroseconds(2);
                     digitalWrite(TRIGGER_PIN, HIGH);
                       delayMicroseconds(10);
                         digitalWrite(TRIGGER_PIN, LOW);

                           // Measure the time it takes for the echo pin to go HIGH
                             long duration = pulseIn(ECHO_PIN, HIGH);

                               // Calculate the distance based on the time and speed of sound
                                 float distance = (duration * 0.5 * SPEED_OF_SOUND) / 10000.0;  // Convert to centimeters

                                   // Print the distance to the serial monitor
                                     Serial.print("Distance: ");
                                       Serial.print(distance, 2);  // Print with 2 decimal places
                                         Serial.println(" cm");

                                           // Add a delay if needed
                                             delay(100);  // 100 milliseconds
                                             }