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

#define RST_PIN 9
#define SS_PIN 10

MFRC522 mfrc522(SS_PIN, RST_PIN);

void setup() {
	Serial.begin(9600);
	SPI.begin();
	mfrc522.PCD_Init();
	Serial.println("Scan an RFID tag...");
}

void loop() {

	if (!mfrc522.PICC_IsNewCardPresent() || !mfrc522.PICC_ReadCardSerial()) 
  {
		return;
	}

	Serial.print("UID: ");
	for (byte i = 0; i < mfrc522.uid.size; i++) {
		Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
		Serial.print(mfrc522.uid.uidByte[i], HEX);
	}
	Serial.println();
	//mfrc522.PICC_HaltA();
}