#define echoPin 8
#define trigPin 10
const int buzzer = 9;
int m = 13;
int k = 12;
int h = 11;
long duration;
int distance;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);;
  pinMode(m, OUTPUT);
  pinMode(k, OUTPUT);
  pinMode(h, OUTPUT);
  Serial.begin(9600);
  Serial.println("Ultrasonic Sensor HC-SRC04 Test");
  Serial.println("With Arduino Uno R3");
}

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("Distance : ");
  Serial.print(distance);
  Serial.println(" cm");
  if (distance > 100) {
    digitalWrite(m, LOW);
    digitalWrite(k, LOW);
    digitalWrite(h, HIGH);
    tone(buzzer, 500);  // Nada rendah
    delay(500);
    noTone(buzzer);
    delay(500);
  } else if (distance > 11 && distance <= 100){
    digitalWrite(m, LOW);
    digitalWrite(k, HIGH);
    digitalWrite(h, LOW);
    tone(buzzer, 700);  // Nada menengah
    delay(300);
    noTone(buzzer);
    delay(300);

  } else if (distance < 10) {
    digitalWrite(m, HIGH);
    digitalWrite(k, LOW);
    digitalWrite(h, LOW);
    tone(buzzer, 1200);  // Nada tertinggi dan cepat
    delay(100);
    noTone(buzzer);
    delay(100);
  } 
  
}