const int trigPin = 7;  // Pin trigger sensor ultrasonic
const int echoPin = 6; // Pin echo sensor ultrasonic
const int ledPinR = 13;  // Pin LED Red untuk indikator
const int buzzerPin = 10;  // Pin buzzer untuk indikator

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

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

  long duration = pulseIn(echoPin, HIGH);
  int distance = duration /58;

  if (distance <= 30) {
    Serial.print("Jarak: ");
    Serial.print(distance);
    Serial.println(" cm");
    digitalWrite(ledPinR, HIGH);
    //digitalWrite(buzzerPin, HIGH); 
    tone(buzzerPin, 300);
    
    delay(100);
    noTone(buzzerPin);
    delay(100);

    
 
  } else if (distance <= 100) {
    Serial.print("Jarak: ");
    Serial.print(distance);
    Serial.println(" cm");
    digitalWrite(ledPinR, HIGH);
    tone(buzzerPin, 300);
    delay(300);
    noTone(buzzerPin);
    delay(300);
    }
    else {
    Serial.println("Jarak diluar jangkauan sensor.");
    digitalWrite(ledPinR, LOW);
    digitalWrite(buzzerPin, LOW); 
   // noTone(buzzerPin);
  }
  delay(100);
}