#include <SPI.h>
#include <MFRC522.h>

#define SS_PIN 17   
#define RST_PIN 20  


MFRC522 rfid(SS_PIN, RST_PIN);


void setup() {
  Serial1.begin(115200);
  delay(2000);  

  SPI.setRX(16);   
  SPI.setTX(19);   
  SPI.setSCK(18);  
  SPI.begin();

  rfid.PCD_Init();

  Serial1.println("RFID Ready - Scan your card...");
}

void loop() {
  
  if (!rfid.PICC_IsNewCardPresent()) {
    return;
}

  if (!rfid.PICC_ReadCardSerial()) {
    return;
  }

  Serial1.print("Card UID: ");
  for (byte i = 0; i < rfid.uid.size; i++) {
    if (rfid.uid.uidByte[i] < 0x10) {
      Serial1.print("0");
    }
    Serial1.print(rfid.uid.uidByte[i], HEX);
    Serial1.print(" ");
  }
  Serial1.println();

  rfid.PICC_HaltA();
}