// Define the pins for the ultrasonic sensor
const int trigPin = 9;
const int echoPin = 10;

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  
  // Define pin modes
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  // Clear the trigger pin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  
  // Send a pulse to the trigger pin
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Measure the duration of the echo pulse
  unsigned long duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance in centimeters
  // Speed of sound = 343 m/s or 34300 cm/s
  // Distance = (Time * Speed) / 2
  float distance = (duration * 34300.0) / (2.0 * 1000000.0); // Convert to meters
  
  // Print the distance to the serial monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" meters");
  
  delay(1000); // Wait for a short time before taking the next measurement
}