#define echoPin 6        // Define the echo pin (receive)
#define triggerPin 7     // Define the trigger pin (transmit)

long duration;          // Variable to store the duration of the sound wave travel
int distance;           // Variable to store the calculated distance

void setup() {
  pinMode(triggerPin, OUTPUT);  // Set trigger pin as an OUTPUT
  pinMode(echoPin, INPUT);      // Set echo pin as an INPUT
  Serial.begin(9600);          // Initialize serial communication at 9600 baud rate
}

void loop() {
  digitalWrite(triggerPin, LOW);   // Ensure the trigger pin is low
  delayMicroseconds(2);            // Short delay
  digitalWrite(triggerPin, HIGH);  // Send a 10us pulse to trigger the sensor
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);

  duration = pulseIn(echoPin, HIGH);  // Measure the duration of the echo pulse
  distance = duration * 0.034 / 2;   // Calculate the distance based on the speed of sound

  Serial.print("Calculated Distance: ");
  Serial.print(distance);
  Serial.println(" cm");             // Print the calculated distance in centimeters

  delay(100);                         // Wait for a short time before taking the next measurement
}