const int echoPin = 11;
const int trigPin = 12;
const int ledPin = 13;
const int buzzerPin = 10;

long duration;
int distance;

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

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  Serial.print("Jarak: ");
  Serial.print(distance);
  Serial.println(" cm");

  if (distance > 10) {
    digitalWrite(ledPin, HIGH); // hidupkan LED
    tone(buzzerPin, 1000);      // bunyikan buzzer dengan frekuensi 1000 Hz
  } else {
    digitalWrite(ledPin, LOW); // matikan LED
    noTone(buzzerPin);         // matikan bunyi buzzer
  }
  delay(1000);
}