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- /*
- * ----------------------------------------------------------------------
- * Example program showing how to read new NUID from a PICC to serial.
- * ----------------------------------------------------------------------
- * https://circuits4you.com
- *
- * LINK: https://circuits4you.com/2018/10/03/rfid-reader-rc522-interface-with-nodemcu-using-arduino-ide/
- *
- * RC522 Interfacing with NodeMCU
- *
- * Typical pin layout used:
- * ----------------------------------
- * MFRC522 Node
- * Reader/PCD MCU
- * Signal Pin Pin
- * ----------------------------------
- * RST/Reset RST D1 (GPIO5)
- * SPI SS SDA(SS) D2 (GPIO4)
- * SPI MOSI MOSI D7 (GPIO13)
- * SPI MISO MISO D6 (GPIO12)
- * SPI SCK SCK D5 (GPIO14)
- * 3.3V 3.3V 3.3V
- * GND GND GND
- */
- #include <SPI.h>
- #include <MFRC522.h>
- constexpr uint8_t RST_PIN = 5; // Configurable, see typical pin layout above
- constexpr uint8_t SS_PIN = 4; // Configurable, see typical pin layout above
- 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(115200);
- 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() {
- // Look for new cards
- 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();
- Serial.println("------------------------");
- }
- else {
- Serial.println(F("Card read previously."));
- Serial.println("------------------------");
- }
- // 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);
- }
- }
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