// Dont Forget to Support My Channel
// Electro Pemula on Youtube and TikTok
// https://www.youtube.com/channel/UCa8eHXL2aL6lc1UN_bcge7A/
// https://www.tiktok.com/@elektropemula/

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);  // Alamat I2C LCD bisa berbeda (0x3F atau 0x27)

#define trigPin 12
#define echoPin 13
#define buzzerPin 2
int ledPins[] = {11, 10, 9, 8, 7, 6, 5, 4, 3};  // Pin untuk 9 LED

void setup() {
  lcd.init();
  lcd.backlight();
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  
  for (int i = 0; i < 9; i++) {
    pinMode(ledPins[i], OUTPUT);
  }

  lcd.setCursor(0, 0);
  lcd.print("Distance: ");
}

void loop() {
  long duration, distance;
  
  // Memicu sensor ultrasonik
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Membaca jarak
  duration = pulseIn(echoPin, HIGH);
  distance = (duration * 0.034 / 2);

  // Menampilkan jarak di LCD
  lcd.setCursor(10, 0);
  lcd.print("    ");
  lcd.setCursor(10, 0);
  lcd.print(distance);
  lcd.print(" cm");

  // Mengatur LED dan buzzer berdasarkan jarak (maksimal 30 cm)
  if (distance <= 5) {
    setLEDs(9);  // Semua LED menyala
    buzzerBeep(100);  // Buzzer berkedip cepat
  } else if (distance <= 7) {
    setLEDs(8);  // 8 LED menyala
    buzzerBeep(200);  // Buzzer berkedip sedang
  } else if (distance <= 9) {
    setLEDs(7);  // 7 LED menyala
    buzzerBeep(300);  // Buzzer berkedip sedang
  } else if (distance <= 12) {
    setLEDs(6);  // 6 LED menyala
    buzzerBeep(400);  // Buzzer lebih lambat
    }else if (distance <= 15) {
    setLEDs(5);  // 5 LED menyala
    buzzerBeep(500);  // Buzzer lebih lambat
  } else if (distance <= 18) {
    setLEDs(4);  // 4 LED menyala
    buzzerBeep(600);  // Buzzer lebih lambat
  } else if (distance <= 21) {
    setLEDs(3);  // 3 LED menyala
    buzzerBeep(700);  // Buzzer lebih lambat lagi
  } else if (distance <= 25) {
    setLEDs(2);  // 2 LED menyala
    buzzerBeep(800);  // Buzzer sangat lambat
  } else if (distance <= 30) {
    setLEDs(1);  // 1 LED menyala
    buzzerBeep(800);  // Buzzer sangat lambat
  } else {
    setLEDs(0);  // Tidak ada LED menyala
    noTone(buzzerPin);  // Buzzer mati
  }

  delay(100);
}

// Fungsi untuk mengatur jumlah LED yang menyala
void setLEDs(int numberOfLEDs) {
  for (int i = 0; i < 9; i++) {
    if (i < numberOfLEDs) {
      digitalWrite(ledPins[i], HIGH);
    } else {
      digitalWrite(ledPins[i], LOW);
    }
  }
}

// Fungsi untuk mengatur buzzer berkedip
void buzzerBeep(int delayTime) {
  tone(buzzerPin, 1000);
  delay(delayTime);
  noTone(buzzerPin);
  delay(delayTime);
}