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

LiquidCrystal_I2C lcd (0x27, 16, 2);

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 pinrows [rows] = {13, 12, 14, 27};
byte pincols [cols] = {26, 25, 33, 32};

Keypad costumKeypad = Keypad (makeKeymap(keys),pinrows,pincols,rows,cols);
char lastKey = ' ';
int sequenceCount = 0;
int errorCount = 0;
unsigned long lastErrorTime = 0;
#define pinled 19


void setup() {
  Serial.begin(9600);
  pinMode(pinled, OUTPUT);
   lcd.init(); // initialize the lcd 
  lcd.backlight(); // turn on backlight
  lcd.print("Selamat datang!");
  
}

void loop() {
  char key = costumKeypad.getKey();
  if (key) {
    Serial.println(key);
  
  if (millis() - lastErrorTime >= 1000) {
    errorCount = 0;
  }
  if (key == '3' && lastKey == ' ') {
    sequenceCount = 1;
  } else if (sequenceCount == 1 && key == '4') {
    sequenceCount = 2;
  } else if (sequenceCount == 2 && key == '7') {
    sequenceCount = 3;
  } else if (sequenceCount == 3 && key == '3') {
    sequenceCount = 4;
    digitalWrite(pinled, HIGH);
    sequenceCount = 0;
    errorCount = 0;
    
  } else {
    sequenceCount = 0;
    errorCount++;
    lastErrorTime = millis();
    if (errorCount >= 4) {
      lcd.setCursor(0, 1);
      lcd.autoscroll();
    lcd.print("Terlalu banyak kesalahan.");
      Serial.println("Terlalu Banyak Mencoba Silahkan tunggu untuk Mencoba kembali.");
      digitalWrite(pinled, LOW);
      delay (1000);
    }
  }
lastKey = key;
  }
}