int trigPin = 7;

int echoPin = 6;

int buzzerPin = 8; // Define the buzzer pin

int distance, duration;

int buzzerThreshold = 20; // Set the distance threshold for the buzzer to sound, adjust as needed

void setup() {

  Serial.begin(9600);

  pinMode(trigPin, OUTPUT);

  pinMode(echoPin, INPUT);

  pinMode(buzzerPin, OUTPUT); // Set the buzzer pin as an output

}

void loop() {

  digitalWrite(trigPin, HIGH);

  delayMicroseconds(10);

  digitalWrite(trigPin, LOW);

  

  duration = pulseIn(echoPin, HIGH);

  distance = (duration / 2) / 29.1;

  Serial.print("Jarak objek: ");

  Serial.print(distance);

  Serial.println(" cm");

  if (distance < buzzerThreshold) {

    // If the distance is less than the threshold, play a tone on the buzzer

    tone(buzzerPin, 1000); // You can adjust the frequency as needed

  } else {

    // If the distance is greater than or equal to the threshold, turn off the buzzer

    noTone(buzzerPin);

  }

  delay(500); // You may want to adjust this delay based on your application.

}