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gistfile1.txt

/*
 * Typical pin layout used:
 * -----------------------------------------------------------------------------------------
 *             MFRC522      Arduino       Arduino   Arduino    Arduino          Arduino
 *             Reader/PCD   Uno/101       Mega      Nano v3    Leonardo/Micro   Pro Micro
 * Signal      Pin          Pin           Pin       Pin        Pin              Pin
 * -----------------------------------------------------------------------------------------
 * RST/Reset   RST          9             5         D9         RESET/ICSP-5     RST
 * SPI SS      SDA(SS)      10            53        D10        10               10
 * SPI MOSI    MOSI         11 / ICSP-4   51        D11        ICSP-4           16
 * SPI MISO    MISO         12 / ICSP-1   50        D12        ICSP-1           14
 * SPI SCK     SCK          13 / ICSP-3   52        D13        ICSP-3           15
 */

#include <SPI.h>
#include <MFRC522.h>

MFRC522 mfrc522(10, 9); 

void setup() {
	Serial.begin(9600);		// Initialize serial communications with the PC
	while (!Serial);		// Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
	SPI.begin();			// Init SPI bus
	mfrc522.PCD_Init();		// Init MFRC522
	delay(4);				// Optional delay. Some board do need more time after init to be ready, see Readme
	mfrc522.PCD_DumpVersionToSerial();	// Show details of PCD - MFRC522 Card Reader details
	Serial.println(F("Scan PICC to see UID, SAK, type, and data blocks..."));

  pinMode(4, OUTPUT);
  digitalWrite(4, 1);
  
  pinMode(3, OUTPUT);
}

byte correct_card[] = { 0xC6, 0x69, 0x79, 0x89 };

#include <Keypad.h>

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 rowPins[ROWS] = {5, 6, 7, 8}
byte colPins[COLS] = {A3, A1, A2, A0};

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

String s=String();
String password = "1234";

void unlock() {
  digitalWrite(3, 1);
  delay(100);
  digitalWrite(3, 0);
  delay(100);
  digitalWrite(3, 1);
  delay(100);
  digitalWrite(3, 0);
  
  digitalWrite(4,0);
  delay(3000);
  digitalWrite(4,1);
}

void badcard() {
  tone(3, 200, 600);
}

void loop() {

  char key = keypad.getKey();

  if (key != 0) {
    digitalWrite(3,1);
    delay(10);
    digitalWrite(3,0);

    if (key == '#') {    
      if (s.equals(password)) {
        unlock();
                        
        s = String();
      } else {
        badcard();
        s = String();
      }
    } else {
      s.concat(key);
    }
  }
  
	// Reset the loop if no new card present on the sensor/reader. This saves the entire process when idle.
	if ( ! mfrc522.PICC_IsNewCardPresent()) {
		return;
	}

	// Select one of the cards
	if ( ! mfrc522.PICC_ReadCardSerial()) {
		return;
	}

  mfrc522.PICC_DumpToSerial(&(mfrc522.uid));
  
  if ( mfrc522.uid.uidByte[0] == correct_card[0] && mfrc522.uid.uidByte[1] == correct_card[1] &&
       mfrc522.uid.uidByte[2] == correct_card[2] && mfrc522.uid.uidByte[3] == correct_card[3] ) {
        
      unlock();
      mfrc522.uid.uidByte[0] = mfrc522.uid.uidByte[1] = mfrc522.uid.uidByte[2] = mfrc522.uid.uidByte[3] = 0;
      
   } else {
     badcard();
     mfrc522.uid.uidByte[0] = mfrc522.uid.uidByte[1] = mfrc522.uid.uidByte[2] = mfrc522.uid.uidByte[3] = 0;

   }
  
}