#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;

void setup() {
  lcd.begin(16, 2);
  lcd.print("Rp");
  lcd.setCursor(7, 0);
  lcd.print(nilai);

}

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

  if (key) {
    if (key >= '0' && key <= '9') {
      // Input angka
      nilai = nilai * 10 + (key - '0');
    } 
    else if (key == '#') {
      // Enter
      lcd.setCursor(7, 0);
      lcd.print(nilai);
      liter = nilai/10000;
      lcd.setCursor(7, 1);
      lcd.print(liter, 2);
      delay(1000);
      lcd.clear();
      lcd.print("Rp");
      for (i=0; i<=nilai; i+=50){
        lcd.setCursor(7, 0);
        lcd.print(i);
        lcd.setCursor(7, 1);
        lcd.print(j+=0.005);
      
      delay(50);
      }
    } 
    else if (key == '*') {
      // Reset
      lcd.clear();
      lcd.print("Rp");
      nilai=0;
      j=0.00;
    }

    lcd.setCursor(7, 0);
    lcd.print(nilai);
  }
}