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

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

      // Set up the trigger pin as an output
        pinMode(trigPin, OUTPUT);
          
            // Set up the echo pin as an input
              pinMode(echoPin, INPUT);
              }

              void loop() {
                // Clear the trigger pin
                  digitalWrite(trigPin, LOW);
                    delayMicroseconds(2);

                      // Set the trigger pin high for 10 microseconds
                        digitalWrite(trigPin, HIGH);
                          delayMicroseconds(10);
                            digitalWrite(trigPin, LOW);

                              // Read the pulse duration from the echo pin
                                long duration = pulseIn(echoPin, HIGH);

                                  // Calculate the distance in centimeters
                                    float distance = duration * 0.0344 / 2;

                                      // Print the distance to the serial monitor
                                        Serial.print("Distance: ");
                                          Serial.print(distance);
                                            Serial.println(" cm");

                                              // Wait for a short period before the next measurement
                                                delay(500);
                                                }