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#include <SPI.h> #include <MFRC522.h> #define RST_PIN 9 #define SS_PIN 10 MFRC522 mfrc522(SS_PIN, RST_PIN); String UIDCard = ""; void setup() { // Initialize serial communication and RFID reader Serial.begin(9600); SPI.begin(); mfrc522.PCD_Init(); Serial.println("Scan your RFID Card:"); for (int i = 0; i < 20; i++) { Serial.print("."); delay(50); } Serial.println(""); } void loop() { // Wait until a new tag is detected while (getUID()) { Serial.print("UID: "); Serial.println(UIDCard); for (int i = 0; i < 20; i++) { Serial.print("."); delay(50); } delay(3000); } } boolean getUID() { if (!mfrc522.PICC_IsNewCardPresent()) { // No card found return false; } if (!mfrc522.PICC_ReadCardSerial()) { // Unable to read the card return false; } UIDCard = ""; for (byte i = 0; i < mfrc522.uid.size; i++) { UIDCard.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ")); UIDCard.concat(String(mfrc522.uid.uidByte[i], HEX)); } UIDCard.toUpperCase(); UIDCard = UIDCard.substring(1); mfrc522.PICC_HaltA(); return true; }
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