Arduino NFC/RFID Door Entry Code

door_entry

#include <SPI.h>
#include <Adafruit_PN532.h>

//Declare shield IO hardware
#define strikePlate 9
#define ledPin 8

// Using hardware serial so only Chip select pin needs to be defined.
#define PN532_SCK  (2)
#define PN532_MOSI (3)
#define PN532_SS   (10)
#define PN532_MISO (5)

// Configure NFC shield device by creating new instance of Adafruit_PN532 called nfc
Adafruit_PN532 nfc(PN532_SCK, PN532_MISO, PN532_MOSI, PN532_SS);

void setup() {
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);
  pinMode(strikePlate, OUTPUT);
  digitalWrite(strikePlate, LOW);

  //Open serial port for debugging
  Serial.begin(115200);
  Serial.print("Start");

  nfc.begin();

  //Shamelessly borrowed from Adafruit lib ***********************
  uint32_t versiondata = nfc.getFirmwareVersion();
  if (! versiondata) {
    Serial.print("Didn't find PN53x board");
    while (1); // halt
  }

  // Got ok data, print it out!
  Serial.print("Found chip PN5"); Serial.println((versiondata>>24) & 0xFF, HEX); 
  Serial.print("Firmware ver. "); Serial.print((versiondata>>16) & 0xFF, DEC); 
  Serial.print('.'); Serial.println((versiondata>>8) & 0xFF, DEC);

  // Set the max number of retry attempts to read from a card
  // This prevents us from waiting forever for a card, which is
  // the default behaviour of the PN532.
  nfc.setPassiveActivationRetries(0xFF);

  // configure board to read RFID tags
  nfc.SAMConfig();

  Serial.println("Waiting for an ISO14443A card");
}
//*************************************************************

  uint8_t card1[] =  { 0x04, 0xDD, 0xD4, 0x12, 0xFF, 0x38, 0x80 };  //card 1 Dwaynes Hand
  uint8_t card2[] =  { 0x93, 0xD5, 0x15, 0xC1, 0, 0, 0 };  //card 2 White Card
  uint8_t card3[] =  { 0x94, 0xBB, 0x17, 0xC5, 0, 0, 0 };  //card 1 belongs to dwayne's hand.

void loop() {
  // put your main code here, to run repeatedly:
  boolean success;
  uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 };  // Buffer to store the returned UID

  uint8_t uidLength;        // Length of the UID (4 or 7 bytes depending on ISO14443A card type)
  unsigned long readID =0;

  // Wait for an ISO14443A type cards (Mifare, etc.).  When one is found
  // 'uid' will be populated with the UID, and uidLength will indicate
  // if the uid is 4 bytes (Mifare Classic) or 7 bytes (Mifare Ultralight)
  success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, &uid[0], &uidLength);

  if (success) {
    Serial.println("Found a card!");
    Serial.print("UID Value: ");
      for (uint8_t i=0; i < uidLength; i++) 
      {
        Serial.print(" 0x");Serial.print(uid[i], HEX); 
        readID += uid[i];
        if(i < (uidLength -1)){
          readID = readID << 8;
        }
      }

    int i=0;
    int card1matches=0;
    int card2matches=0;
    int card3matches=0;

    for(i=0;i<7;i++)
    {
      if(uid[i] == card1[i])
      {
        card1matches++;      
      }
      if(uid[i] == card2[i])
      {
        card2matches++;      
      }
      if(uid[i] == card3[i])
      {
        card3matches++;      
      }
    }

    if(card1matches == 7)
    {
      Unlock();
    }
    if(card2matches == 7)
    {
      Unlock();
    }
    if(card3matches == 7)
    {
      Unlock();
    }

      delay(1000);
  }
  else
  {
    // PN532 probably timed out waiting for a card
    Serial.println("Timed out waiting for a card");
  }
}

void Unlock()
  {
        Serial.println("");
        Serial.println("Unlocking!!");
        digitalWrite(strikePlate, HIGH);
        digitalWrite(ledPin, HIGH);
        delay(2000);
        digitalWrite(strikePlate, LOW);
        digitalWrite(ledPin, LOW);

    }