// LCD1602 to Arduino Uno connection example

#include <LiquidCrystal.h>
#include <Keypad.h>

#define Password_Length 4
char Data[Password_Length + 1] = {0};
char myPassword[] = "1234";
byte data_count = 0;

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 5, 4, 3, 2 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 9, 8, 7, 6 }; // Pins connected to R1, R2, R3, R4

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


void setup() {
  lcd.begin(16, 2);
  Serial.begin(9600);

}

void loop() {
  //  lcd.print("M & sh");

  char key = keypad.getKey();
  if (key != 0x00) {
    Data[data_count] = key;
    lcd.print(key);
    Serial.print(Data[data_count]);
    data_count++;
    if (data_count == 4)
    {
      lcd.clear();
      Serial.println();  //insert Newline on Serial Monitor
      if (strcmp(myPassword, Data) == 0) //password has matched
      {
        data_count = 0;   //index is reset
        memset(Data, 0, 5); //array is cleared
        lcd.print("M & sh");
      }
    }

    // lcd.print("M & sh");
    // Serial.println(key);

  }

}