#if 0
  #include <SPI.h>
  #include <PN532_SPI.h>
  #include "PN532.h"

  PN532_SPI pn532spi(SPI, 10);
  PN532 nfc(pn532spi);

/* When the number after #elif set as 1, it will be switch to HSU Mode*/
#elif 0
  #include <PN532_HSU.h>
  #include <PN532.h>

  PN532_HSU pn532hsu(Serial1);
  PN532 nfc(pn532hsu);

/* When the number after #if & #elif set as 0, it will be switch to I2C Mode*/
#else
  #include <Wire.h>
  #include <PN532_I2C.h>
  #include <PN532.h>
  #include <NfcAdapter.h>

  PN532_I2C pn532i2c(Wire);
  PN532 nfc(pn532i2c);
#endif

void setup(void) {
  Serial.begin(115200);
  Serial.println("Hello!");

  nfc.begin();

  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");
}

void loop(void) {
  uint8_t TagUid[]={0xCE,0xA0,0x53,0x73};
  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)

  // 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 Length: ");Serial.print(uidLength, DEC);Serial.println(" bytes");
    Serial.print("UID Value: ");
    for (uint8_t i=0; i < uidLength; i++)
    {
      Serial.print(" 0x");Serial.print(uid[i], HEX);
    }
    for (int count=0; count < uidLength; count++)
    {
      if (uid[count]==TagUid[count])
      {
        if (count == 3){ Serial.println("");
          Serial.println("you have a matching card");
          delay(1000);
          }
      }else {
        if (count == 3){
          Serial.println("");
          Serial.println("You have a non-matching card");
          delay(1000);}
      }

      if (count==4) return;
     }
   }
  }