/*

• ---

• Example sketch/program showing how to read new NUID from a PICC to serial.

• ---

• This is a MFRC522 library example; for further details and other examples see: https://github.com/miguelbalboa/rfid
• Example sketch/program showing how to the read data from a PICC (that is: a RFID Tag or Card) using a MFRC522 based RFID
• Reader on the Arduino SPI interface.
• When the Arduino and the MFRC522 module are connected (see the pin layout below), load this sketch into Arduino IDE
• then verify/compile and upload it. To see the output: use Tools, Serial Monitor of the IDE (hit Ctrl+Shft+M). When
• you present a PICC (that is: a RFID Tag or Card) at reading distance of the MFRC522 Reader/PCD, the serial output
• will show the type, and the NUID if a new card has been detected. Note: you may see "Timeout in communication" messages
• when removing the PICC from reading distance too early.
• @license Released into the public domain.
• 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

include

define SS_PIN 10

define RST_PIN 9

MFRC522 rfid(SS_PIN, RST_PIN); // Instance of the class

MFRC522::MIFARE_Key key;

// Init array that will store new NUID byte nuidPICC[4];

void setup() { Serial.begin(9600); SPI.begin(); // Init SPI bus rfid.PCD_Init(); // Init MFRC522

for (byte i = 0; i < 6; i++) { key.keyByte[i] = 0xFF; }

Serial.println(F("This code scan the MIFARE Classsic NUID.")); Serial.print(F("Using the following key:")); printHex(key.keyByte, MFRC522::MF_KEY_SIZE); }

void loop() {

// Reset the loop if no new card present on the sensor/reader. This saves the entire process when idle. if ( ! rfid.PICC_IsNewCardPresent()) return;

// Verify if the NUID has been readed if ( ! rfid.PICC_ReadCardSerial()) return;

Serial.print(F("PICC type: ")); MFRC522::PICC_Type piccType = rfid.PICC_GetType(rfid.uid.sak); Serial.println(rfid.PICC_GetTypeName(piccType));

// Check is the PICC of Classic MIFARE type if (piccType != MFRC522::PICC_TYPE_MIFARE_MINI &&
piccType != MFRC522::PICC_TYPE_MIFARE_1K && piccType != MFRC522::PICC_TYPE_MIFARE_4K) { Serial.println(F("Your tag is not of type MIFARE Classic.")); return; }

if (rfid.uid.uidByte[0] != nuidPICC[0] || rfid.uid.uidByte[1] != nuidPICC[1] || rfid.uid.uidByte[2] != nuidPICC[2] || rfid.uid.uidByte[3] != nuidPICC[3] ) { Serial.println(F("A new card has been detected."));

// Store NUID into nuidPICC array
for (byte i = 0; i < 4; i++) {
  nuidPICC[i] = rfid.uid.uidByte[i];
}

Serial.println(F("The NUID tag is:"));
Serial.print(F("In hex: "));
printHex(rfid.uid.uidByte, rfid.uid.size);
Serial.println();
Serial.print(F("In dec: "));
printDec(rfid.uid.uidByte, rfid.uid.size);
Serial.println();

} else Serial.println(F("Card read previously."));

// Halt PICC rfid.PICC_HaltA();

// Stop encryption on PCD rfid.PCD_StopCrypto1(); }

/**

• Helper routine to dump a byte array as hex values to Serial. / void printHex(byte buffer, byte bufferSize) { for (byte i = 0; i < bufferSize; i++) { Serial.print(buffer[i] < 0x10 ? " 0" : " "); Serial.print(buffer[i], HEX); } }

/**

• Helper routine to dump a byte array as dec values to Serial. / void printDec(byte buffer, byte bufferSize) { for (byte i = 0; i < bufferSize; i++) { Serial.print(buffer[i] < 0x10 ? " 0" : " "); Serial.print(buffer[i], DEC); } }