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

// Variables to store the duration and distance
long duration;
int distance;

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  
  // Set trigPin as an OUTPUT
  pinMode(trigPin, OUTPUT);
  
  // Set echoPin as an INPUT
  pinMode(echoPin, INPUT);
}

void loop() {
  // Trigger the ultrasonic sensor by sending a 10us pulse
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Read the echo duration in microseconds
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance in centimeters (you can change this to inches by dividing by 148 instead)
  distance = duration / 58;
  
  // Print the distance to the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  
  // Add a small delay between measurements
  delay(500); // Adjust this delay as needed
}