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

LiquidCrystal_I2C lcd(0x27,16,2);

char tombol [4][4]=

{
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'},
};
byte pinBaris[]={33,32,19,18};
byte pinKolom[]={5,4,2,15};
Keypad keypad=Keypad(makeKeymap(tombol),pinBaris,pinKolom,4,4);
char customKey;
int number = 0;
int password = 1321;
int ledmerah =0;
int ledhijau = 16;
void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
pinMode(ledmerah, OUTPUT);
pinMode(ledhijau, OUTPUT);
digitalWrite(ledmerah, LOW);
digitalWrite(ledhijau, LOW);
}
void loop() {
  lcd.setCursor(0,0);
  lcd.print("Input Password");
  customKey= keypad.getKey();
  switch(customKey){
    case '0' ... '9':
lcd.setCursor(0,1);
number = number * 10 + (customKey - '0');
lcd.print (number);
break;

case '#':
if (number == password){
  lcd.setCursor(0,1);
  lcd.print ("Access Accepted");
  digitalWrite(ledhijau, HIGH);
  delay (5000);
  number = 0;
  lcd.clear();
  digitalWrite(ledhijau, LOW);
}

else{
   lcd.setCursor(0,1);
  lcd.print ("Invalid Password");
  digitalWrite(ledmerah, HIGH);
  delay (5000);
  number = 0;
  lcd.clear();
  digitalWrite(ledmerah, LOW);
}
break;
case '*':
number = 0;
lcd.clear();
break;

      }

}