#include <LiquidCrystal_I2C.h>
#include <Keypad.h>

/* Keypad Setting ########## */

const byte ROWS = 4;
const byte COLS = 4;

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

byte rowPins[ROWS] = {9,8,7,4};
byte colPins[COLS] = {3,A3,A2,A1};

Keypad ABC = Keypad(makeKeymap(keys), 
                    rowPins, colPins, 
                    ROWS, COLS);

/* LCD setting ############# */

LiquidCrystal_I2C lcd(0x27,  16, 2); 

String str[] = {"Hello world", 
                "ARIS department", 
                "Key press = ", 
                "Enter Next Key"};

/* ######################### */

void setup(){
  
  lcd.init();
  lcd.backlight();
  lcd.clear();
  
  lcd.setCursor(0,0);
  lcd.print(str[0]);
  lcd.setCursor(0,1);
  lcd.print(str[1]);
  delay(2000);
  
  Serial.begin(9600);

}

void loop(){
  
  char key_press = ABC.getKey();
  
  if(key_press){
    Serial.print("Keypad = ");
    Serial.println(key_press);
    
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print(str[2]);
    lcd.setCursor(10,0);
    lcd.print(key_press);
    lcd.setCursor(0,1);
    lcd.print(str[3]);
  }
}