#define ECHO_PIN 2
#define TRIG_PIN 15
#define Red_Led 19
#define Yellow_Led 18
#define Green_Led 5
#define Blue_Led 17

void setup() {
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(Red_Led, OUTPUT);
  pinMode(Yellow_Led, OUTPUT);
  pinMode(Green_Led, OUTPUT);
  pinMode(Blue_Led, OUTPUT);
}

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() {
  float distance = readDistanceCM();

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

  if (distance > 300) {
    digitalWrite(Red_Led, HIGH);
    digitalWrite(Yellow_Led, HIGH);
    digitalWrite(Green_Led, HIGH);
    digitalWrite(Blue_Led, HIGH);
    tone(14, 500, 250);
  } else if (distance > 200) {
    digitalWrite(Red_Led, HIGH);
    digitalWrite(Yellow_Led, HIGH);
    digitalWrite(Green_Led, HIGH);
    digitalWrite(Blue_Led, LOW);
    noTone(14);
  } else if (distance > 100) {
    noTone(14);
    digitalWrite(Red_Led, HIGH);
    digitalWrite(Yellow_Led, HIGH);
    digitalWrite(Green_Led, LOW);
    digitalWrite(Blue_Led, LOW);
  } else if (distance > 50) {
    noTone(14);
    digitalWrite(Red_Led, HIGH);
    digitalWrite(Yellow_Led, LOW);
    digitalWrite(Green_Led, LOW);
    digitalWrite(Blue_Led, LOW);
  } else {
    noTone(14);
    digitalWrite(Red_Led, LOW);
    digitalWrite(Yellow_Led, LOW);
    digitalWrite(Green_Led, LOW);
    digitalWrite(Blue_Led, LOW);
  }

  delay(100);
}