#include <LiquidCrystal.h>
#include <Keypad.h>

const int ROW_NUM    = 4; // jumlah baris pada keypad
const int COLUMN_NUM = 4; // jumlah kolom pada keypad

char keys[ROW_NUM][COLUMN_NUM] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','=','D'}
};

byte pin_rows[ROW_NUM] = {7, 6, 5, 4};      // terhubung dengan pin-pins baris keypad
byte pin_column[COLUMN_NUM] = {3, 2, 1, 0}; // terhubung dengan pin-pins kolom keypad

Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM);

LiquidCrystal lcd(13, 12, 11, 10, 9, 8);  // Sesuaikan pin LCD dengan koneksi di Arduino
float nilai = 0;
float liter, i;
float j = 0.00;

// Deklarasi nilai A, B, C, D
const float nilaiA = 25000;
const float nilaiB = 50000;
const float nilaiC = 100000;
const float nilaiD = 200000;

void showSplashScreen() {
  lcd.setCursor(0, 1);
  String message1 = "Kel. Mikrokontroler";
  for (byte s = 0; s < message1.length(); s++) {
    lcd.print(message1[s]);
    delay(75);
  }

  lcd.setCursor(0, 2);
  String message2 = "Program Pompa SPBU";
  for (byte a = 0; a < message2.length(); a++) {
    lcd.print(message2[a]);
    delay(75);
  }
  delay(1500);
}

void setup() {
  lcd.begin(20, 4);
  showSplashScreen();
  lcd.clear();
  lcd.setCursor(0, 1);
  lcd.print("Total Rp : ");
  lcd.setCursor(0, 2);
  lcd.print("Liter    : ");
  lcd.setCursor(11, 1);
  lcd.print(nilai);
}

void loop() {
  char key = keypad.getKey();

  if (key) {
    if (key >= '0' && key <= '9') {
      // Input angka
      nilai = nilai * 10 + (key - '0');
      lcd.setCursor(11, 1);
      lcd.print(nilai);
    } 
    else if (key == '=') {
      // Enter
      lcd.setCursor(0, 1);
      lcd.print("Total Rp : ");
      lcd.setCursor(0, 2);
      lcd.print("Liter    : ");
      lcd.setCursor(11, 1);
      lcd.print(nilai);
      liter = nilai / 10000.0;
      lcd.setCursor(11, 2);
      lcd.print(liter, 2);
      delay(1000);
      lcd.clear();
      lcd.setCursor(0, 1);
      lcd.print("Total Rp : ");
      lcd.setCursor(0, 2);
      lcd.print("Liter    : ");
      for (i = 0; i <= nilai; i += 500) {
        lcd.setCursor(11, 1);
        lcd.print(i);
        lcd.setCursor(11, 2);
        lcd.print(j += 0.05);
        delay(50);
      }
      lcd.setCursor(11, 2);
      lcd.print(liter);
    } 
    else if (key == '*') {
      // Reset
      lcd.clear();
      lcd.setCursor(0, 1);
      lcd.print("Total Rp : ");
      lcd.setCursor(0, 2);
      lcd.print("Liter    : ");
      nilai = 0;
      j = 0.00;
    }
    else if (key == 'A') {
      nilai = nilaiA;
      lcd.setCursor(11, 1);
      lcd.print(nilai);
    }
    else if (key == 'B') {
      nilai = nilaiB;
      lcd.setCursor(11, 1);
      lcd.print(nilai);
    }
    else if (key == 'C') {
      nilai = nilaiC;
      lcd.setCursor(11, 1);
      lcd.print(nilai);
    }
    else if (key == 'D') {
      nilai = nilaiD;
      lcd.setCursor(11, 1);
      lcd.print(nilai);
    }
  }
}