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

const int ROWS = 4;
const int 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, 6}; // connect to the row pinouts of the keypad
byte colPins[COLS] = {5, 4, 3, 2}; // connect to the column pinouts of the keypad

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows

void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.print("Security System");
  delay(1000);
  lcd.clear();
}

void loop() {
  // set the cursor to (0,0):
  lcd.setCursor(0, 0);
  // print from 0 to 9:
  for (int thisChar = 0; thisChar < 15; thisChar++) {
    lcd.print(thisChar);
    delay(1000);
  }

  // set the cursor to (16,1):
  lcd.setCursor(16, 1);
  // set the display to automatically scroll:
  lcd.autoscroll();
  // print from 0 to 9:
  for (int thisChar = 0; thisChar < 15; thisChar++) {
    lcd.print(thisChar);
    delay(1000);
  }
  // turn off automatic scrolling
  lcd.noAutoscroll();

  // clear screen for the next loop:
  lcd.clear();
}