#define ECHO_PIN 2
#define TRIG_PIN 15
#define LED_HIJAU 19
#define LED_BIRU 18
#define LED_KUNING 5
#define LED_MERAH 17
#define BUZZER 4

void setup() {
  Serial.begin(115200);
  pinMode(LED_HIJAU, OUTPUT);
  pinMode(LED_BIRU, OUTPUT);
  pinMode(LED_KUNING, OUTPUT);
  pinMode(LED_MERAH, OUTPUT);
  pinMode(BUZZER, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}

void loop() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;

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

  delay(50);

  if(distance<=50){
    digitalWrite(LED_HIJAU, HIGH);
    digitalWrite(LED_BIRU, LOW);
    digitalWrite(LED_KUNING, LOW);
    digitalWrite(LED_MERAH, LOW);
    digitalWrite(BUZZER, LOW);
    Serial.println("Batas Aman");
  }
  if(distance>=50 && distance<=100){
    digitalWrite(LED_HIJAU, HIGH);
    digitalWrite(LED_BIRU, HIGH);
    digitalWrite(LED_KUNING, LOW);
    digitalWrite(LED_MERAH, LOW);
    digitalWrite(BUZZER, LOW);
    Serial.println("Waspada");
  }
  if(distance>=100 && distance<=200){
    digitalWrite(LED_HIJAU, HIGH);
    digitalWrite(LED_BIRU, HIGH);
    digitalWrite(LED_KUNING, HIGH);
    digitalWrite(LED_MERAH, LOW);
    digitalWrite(BUZZER, LOW);
    Serial.println("Siaga");
  }
  else if(distance>=300){
    digitalWrite(LED_HIJAU, HIGH);
    digitalWrite(LED_BIRU, HIGH);
    digitalWrite(LED_KUNING, HIGH);
    digitalWrite(LED_MERAH, HIGH);
    digitalWrite(BUZZER, HIGH);
    tone(BUZZER, 1030);
    delay(350);
    noTone(8);
    delay(50);
    Serial.println("Awas");
  }
}