#include <LedControl.h>
// Include Keypad library
#include <Keypad.h>

// Password Length
const int Password_Length = 4;
// Character to hold password input
String Data;
// Password
String Master = "0001";

// Pin connected to lock relay signal
int lockOutput = 11;

// Counter for character entries
byte data_count = 0;

// Character to hold key input
char customKey;

// Constants for row and column sizes
const byte ROWS = 4;
const byte COLS = 4;

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

// Connections to Arduino
byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};

// Create keypad object
Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);


int DIN = 12;
int CS =  11;
int CLK = 10;
LedControl lc=LedControl(DIN,CLK,CS,0);

void setup() {
 lc.shutdown(0,false);       
 lc.setIntensity(0,15);    

  // Set lockOutput as an OUTPUT pin
  pinMode(lockOutput, OUTPUT);
}

void printByte(byte character [])
{
  int i = 0;
  for(i=0;i<8;i++)
  {
    lc.setRow(0,i,character[i]);
  }
}
void loop() {
  
  

  // Look for keypress
  customKey = customKeypad.getKey();
  if (customKey) {
    // Enter keypress into array and increment counter
    Data += customKey;
    data_count++;
  }

  // See if we have reached the password length
  if (data_count == Password_Length) {
   
    if (Data == Master) {
      // Correct Password
    byte SMILE[8]=   {0x3C,0x42,0xA5,0x81,0xA5,0x99,0x42,0x3C};
      printByte(SMILE);
        

      // Turn on relay for 5 seconds
      digitalWrite(lockOutput, HIGH);
      delay(5000);
      digitalWrite(lockOutput, LOW);
    }
    else {
      // Incorrect Password
      byte SAD[8]=   {0x3C,0x42,0xA5,0x81,0x99,0xA5,0x42,0x3C};
      printByte(SAD);
      
      delay(1000);
    }

    // Clear data and LCD display
  
    clearData();
  }
}

void clearData() {
  //Reset data_count
  data_count = 0;
  //Reset Data
  Data ="";
}