#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

void angka5() {
  digitalWrite(22, 1);
  digitalWrite(23, 0);
  digitalWrite(24, 1);
  digitalWrite(25, 1);
  digitalWrite(26, 0);
  digitalWrite(27, 1);
  digitalWrite(28, 1);
  digitalWrite(29, 0);
}

void angka1() {
  digitalWrite(22, 0);
  digitalWrite(23, 1);
  digitalWrite(24, 1);
  digitalWrite(25, 0);
  digitalWrite(26, 0);
  digitalWrite(27, 0);
  digitalWrite(28, 0);
  digitalWrite(29, 0);
}

void angka9() {
  digitalWrite(22, 1);
  digitalWrite(23, 1);
  digitalWrite(24, 1);
  digitalWrite(25, 1);
  digitalWrite(26, 0);
  digitalWrite(27, 1);
  digitalWrite(28, 1);
  digitalWrite(29, 0);
}

void angka0() {
  digitalWrite(22, 1);
  digitalWrite(23, 1);
  digitalWrite(24, 1);
  digitalWrite(25, 1);
  digitalWrite(26, 1);
  digitalWrite(27, 1);
  digitalWrite(28, 0);
  digitalWrite(29, 0);
}

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.begin(16, 2);

  pinMode(22, OUTPUT);
  pinMode(23, OUTPUT);
  pinMode(24, OUTPUT);
  pinMode(25, OUTPUT);
  pinMode(26, OUTPUT);
  pinMode(27, OUTPUT);
  pinMode(28, OUTPUT);
  pinMode(29, OUTPUT);
  
  Serial.begin(9600);
  Serial.println("Mikrokontroler : 23.11.5901");
}

void loop() {
  if (Serial.available()) {
    String command = Serial.readStringUntil('\n');
    command.trim();

    if (command.equalsIgnoreCase("start")) {
      displaySevenSegment();
      displayLCDCountdown();
    }
  }
}

void displaySevenSegment() {
  angka5();
  delay(1000);
  angka9();
  delay(1000);
  angka0();
  delay(1000);
  angka1();
  delay(1000);

  clearSegments(); // Matikan semua segmen setelah menampilkan "5901"
}

void clearSegments() {
  digitalWrite(22, 0);
  digitalWrite(23, 0);
  digitalWrite(24, 0);
  digitalWrite(25, 0);
  digitalWrite(26, 0);
  digitalWrite(27, 0);
  digitalWrite(28, 0);
  digitalWrite(29, 0);
}

void displayLCDCountdown() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.write(byte(0)); 
  lcd.write(byte(1)); 
  lcd.write(byte(2));

  lcd.setCursor(0, 1);
  lcd.write(byte(3)); 
  lcd.write(byte(4)); 
  lcd.write(byte(5));
  
  lcd.setCursor(4, 0);
  lcd.print("Michael");  // Display first name
  lcd.setCursor(0, 1);
  lcd.write(byte(0)); 
  lcd.write(byte(1)); 
  lcd.write(byte(2));

  for (int i = 10; i >= 0; i--) {
    lcd.setCursor(4, 1);  // Set cursor to show count in the second line
    lcd.print("   ");
    lcd.setCursor(4, 1);
    lcd.print(i);  // Display countdown

    Serial.print("Count: ");
    Serial.println(i);  // Show countdown on Serial Monitor
    delay(1000);
  }
}