#include <LiquidCrystal_I2C.h>

int segmentPins[] = {22, 23, 24, 25, 26, 27, 28, 29};
byte numbers[4] = {
  B11011001, // Angka 5
  B01111011, // Angka 0
  B11111011, // Angka 8
  B11011011  // Angka 9
};
int currentDigit = 0;
const int numDigits = 4;
const int delayTime = 1000;
unsigned long previousMillis = 0;

LiquidCrystal_I2C lcd(0x27, 16, 2);
byte customChar0[8] = {
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00011,
};

byte customChar1[8] = {
  0b00000,
  0b01100,
  0b10010,
  0b10010,
  0b10001,
  0b01000,
  0b11100,
  0b00000,
};

byte customChar2[8] = {
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b10000,
  0b01000,
  0b00110,
};

byte customChar3[8] = {
  0b00100,
  0b00011,
  0b00100,
  0b00011,
  0b00100,
  0b00011,
  0b00010,
  0b00001,
};

byte customChar4[8] = {
  0b00000,
  0b11000,
  0b00000,
  0b11000,
  0b00000,
  0b11000,
  0b00001,
  0b11110,
};

byte customChar5[8] = {
  0b00010,
  0b00010,
  0b00010,
  0b00010,
  0b00010,
  0b01110,
  0b10000,
  0b00000,
};
char namaDepan[] = "DIYU"; // Ganti dengan nama depan Anda
int count = 10;

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.begin(16, 2);
  
  lcd.createChar(0, customChar0);
  lcd.createChar(1, customChar1);
  lcd.createChar(2, customChar2);
  lcd.createChar(3, customChar3);
  lcd.createChar(4, customChar4);
  lcd.createChar(5, customChar5);
  
  for (int i = 0; i < 8; i++) {
    pinMode(segmentPins[i], OUTPUT);
  }

  Serial.begin(9600);
  Serial.println("Mikrokontroler: 22.11.5089");

  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("DIYU ");
}

void loop() {
  if (Serial.available() > 0) {
    String input = Serial.readString();
    input.trim();

    if (input.equalsIgnoreCase("mulai")) {
      while (count >= 0) {
        lcd.setCursor(4, 1);
        lcd.print(count);
        Serial.println(count);
        
        displayNumber(numbers[currentDigit]);
        currentDigit = (currentDigit + 1) % numDigits;
        delay(1000);
        count--;
      }
    }
  }
}

void displayNumber(byte number) {
  for (int i = 0; i < 8; i++) {
    digitalWrite(segmentPins[i], bitRead(number, i));
  }
}