const int trigPin = 9;
const int echoPin = 10;

long duration;
int distance;

void setup() {
  pinMode(trigPin, OUTPUT);
    pinMode(echoPin, INPUT);
      Serial.begin(9600);
      }

      void loop() {
        // Clear the trigger pin
          digitalWrite(trigPin, LOW);
            delayMicroseconds(2);
              
                // Send a 10-microsecond pulse to trigger pin
                  digitalWrite(trigPin, HIGH);
                    delayMicroseconds(10);
                      digitalWrite(trigPin, LOW);
                        
                          // Read the echo pin
                            duration = pulseIn(echoPin, HIGH);
                              
                                // Calculate the distance in cm
                                  distance = duration * 0.034 / 2;
                                    
                                      // Print the distance to Serial Monitor
                                        Serial.print("Distance: ");
                                          Serial.print(distance);
                                            Serial.println(" cm");

                                              delay(500); // Delay for readability
                                              }