#include <Keypad.h>                 //Library keypad
#include <LiquidCrystal_I2C.h>    //Library LCD I2C
LiquidCrystal_I2C lcd(0x27,16,2);   //Alamat I2C

int Li          = 17;
int Lii         = 1; 
int Ri          = -1;
int Rii         = -1;

void setup() {
  // put your setup code here, to run once:
lcd.init();
}

void loop() {
  // put your main code here, to run repeatedly:
 for (int i = 0; i <= 18; i++) {
    lcd.setCursor(0, 0);
    lcd.backlight();
    lcd.print(Scroll_LCD_Right(" InternetofThings "));
    delay(350);
  }
  for (int i = 0; i <= 50; i++) {                                
    lcd.setCursor(0, 1);  
    lcd.backlight();                                              
    lcd.print(Scroll_LCD_Left("LCD 16x2   scrolling text"));
    delay(350);
  }
  Clear_Scroll_LCD_Left();
  for (int i = 17; i <= 32; i++) {
    lcd.setCursor(0, 0);
    lcd.backlight();
    lcd.print(Scroll_LCD_Right("IoT4"));
    delay(350);
  }
  Clear_Scroll_LCD_Right();
  for (int i = 0; i <= 14; i++) {
    lcd.setCursor(0, 0);
    lcd.backlight();
    lcd.print(Scroll_LCD_Right("Indobot"));
    delay(350);
  } 
  for (int i = 0; i <= 72; i++) {
    lcd.setCursor(0, 1);
    lcd.backlight();
    lcd.print(Scroll_LCD_Left("Welcome to DTS PROA"));
    delay(350);
  }
  Clear_Scroll_LCD_Left();
  for (int i = 14; i <= 25; i++) {
    lcd.setCursor(0, 0);
    lcd.backlight();
    lcd.print(Scroll_LCD_Right("Endless Learning"));
    delay(350);
  }
  Clear_Scroll_LCD_Right();
}
//----------------------------------
String Scroll_LCD_Left(String StrDisplay){
  String result;
  String StrProcess = "                " + StrDisplay + "                ";
  result = StrProcess.substring(Li,Lii);
  Li++;
  Lii++;
  if (Li>StrProcess.length()){
    Li=16;
    Lii=0;
  }
  return result;
}

void Clear_Scroll_LCD_Left(){
  Li=16;
  Lii=0;
}
//----------------------------------
String Scroll_LCD_Right(String StrDisplay){
  String result;
  String StrProcess = "                " + StrDisplay + "                ";
  if (Rii<1){
    Ri  = StrProcess.length();
    Rii = Ri-16;
  }
  result = StrProcess.substring(Rii,Ri);
  Ri--;
  Rii--;
  return result;
}

void Clear_Scroll_LCD_Right(){
  Ri=-1;
  Rii=-1;
}




/*#include <Wire.h> //library I2C

  #include <LiquidCrystal_I2C.h>    //library LCD

  LiquidCrystal_I2C lcd(0x27,16,2); // set address I2C dan besar karakter untuk lcd 16×2

  void setup()

  {

    lcd.init(); // inisiasi LCD

  }

  void loop()

  {

    lcd.backlight();//menyalakan backlight

    lcd.print("Hello, world!");//menulis kata

    lcd.scrollDisplayLeft();

    delay(2000);//menunggu 2000 milidetik

    lcd.clear();//menghapus tampilan LCD

    lcd.noBacklight();//mematikan backlight

    lcd.print("Lampu Mati");//menulis kata

    delay(2000);//menunggu 2000 milidetik

    lcd.clear();//menghapus tampilan LCD

    lcd.backlight();//menyalakan backlight

    lcd.print("Lampu Hidup");//menulis kata

    delay(2000);//menunggu 2000 milidetik

    lcd.clear();//menghapus tampilan LCD

    lcd.setCursor(0,0);//mengatur posisi kursor pada baris 1 posisi 0

    lcd.print("Baris satu");//menulis kata

    lcd.setCursor(3,1);//mengatur posisi kursor pada baris 2 posisi 3

    lcd.print("Geser Baris 2");//menulis kata

    delay(3000);//menunggu 3000 milidetik

    lcd.clear();//menghapus tampilan LCD
  }
/*



/*
const byte ROWS = 4;    //Jumlah baris keypad
const byte COLS = 4;    //Jumlah kolom keypad

char Keys[ROWS][COLS] = {   //Membuat array keypad
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

byte rowPins[ROWS] = { 14, 12, 19, 18 }; 
byte colPins[COLS] = { 5, 4, 2, 15 };

Keypad customKeypad = Keypad( makeKeymap(Keys), rowPins, colPins, ROWS, COLS);    //Masukkan info keypad pada library


char customKey;         //Variabel penampung input keypad
int number = 0;         //Variabel penampung nilai angka
int password = 1379;    //Password

void setup() {
  lcd.init ();              //Mulai LCD
  lcd.setBacklight(HIGH);   //Nyalakan backlight
  pinMode(26, OUTPUT);
  pinMode(25, OUTPUT);
  
}

void loop() {
  lcd.setCursor(0,0);
  lcd.print("Input Password");      //Tampilan pada layar LCD
  
  customKey = customKeypad.getKey();    //Baca input keypad

  //------------Prosedur jika input berupa angka------------//
  switch(customKey){
    case '0' ... '9':
      lcd.setCursor(0,1);
      number = number * 10 + (customKey - '0');
      lcd.print(number);
    break;

    //------------Jika input '#' maka cek password------------//
    case '#':
      if(number == password){           //Jika password benar, maka
        lcd.setCursor(0,1);
        lcd.print("Access Accepted ");  //Tampilan LCD
        delay(2000);
        number = 0;
        digitalWrite(26, HIGH);
        digitalWrite(25, LOW);
        lcd.clear(); 
      }
      else{                             //Jika salah, maka
        lcd.setCursor(0,1);
        lcd.print("Invalid Password");  //Tampilan LCD
        delay(2000);
        number = 0;
        digitalWrite(26, LOW);
        digitalWrite(25, HIGH);
        lcd.clear(); 
      }
    break;

    //------------Jika input '*' maka hapus tampilan------------//
    case '*':
      number = 0;
      lcd.clear();
    break;
  }
}/* Program Kunci Pintu dengan password input Keypad 4x4 dibuat oleh Indobot */