#!/usr/bin/env python
# -*- coding: utf8 -*-

import RPi.GPIO as GPIO
import MFRC522



# Create an object of the class MFRC522
MIFAREReader = MFRC522.MFRC522()



# Scan for cards    
(status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)


# Get the UID of the card
(status,uid) = MIFAREReader.MFRC522_Anticoll()


# If we have the UID, continue
if status == MIFAREReader.MI_OK:

    # Print UID
    suid =        str(hex(uid[0]))[2:];
    suid += '-' + str(hex(uid[1]))[2:];
    suid += '-' + str(hex(uid[2]))[2:];
    suid += '-' + str(hex(uid[3]))[2:];

    print suid;

    exit(0);

else:

    exit(127);