Raspberry Pi - NFC door opener

As shown in the previous tutorial, using the MFRC522-python library (https://github.com/mxgxw/MFRC522-python.git) and the data read example script, I'm able to read the UniqueID (UID) of my NFC card.

On GPIO17 (= pin 11) I have the 220v relay signal that open the electric door lock. Therefore, editing the read example script, if an allowed UID is read than the door will be opened!

I add also a log file to control if somebody try to force the system

import RPi.GPIO as GPIO

import MFRC522

import signal

import time

import logging

# Logging

logging.basicConfig(filename='/var/www/nfc.log',

                            filemode='a',

                            format='%(asctime)s %(levelname)s %(message)s',

                            datefmt='%d/%m/%Y %H:%M:%S',

                            level=logging.DEBUG)

logging.info("script initialized")

# Create an object of the class MFRC522

MIFAREReader = MFRC522.MFRC522()

# 220v relay - electric door opener

GPIO.setmode(GPIO.BOARD) ## Use board pin numbering

GPIO.setup(11, GPIO.OUT) ## Setup GPIO17 -> pin 11 to OUT

GPIO.output(11,1)

# This loop keeps checking for chips. If one is near it will get the UID and authenticate

while true:

    

    # Scan for cards    

    (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)

    # If a card is found

    if status == MIFAREReader.MI_OK:

    

          # Get the UID of the card

          (status,uid) = MIFAREReader.MFRC522_Anticoll()

          # If we have the UID, continue

          if status == MIFAREReader.MI_OK:

          # My card UID

myUID = [141,113,243,56, 231]

# Check if authenticated

          if uid == myUID:

                  # open the door

                 GPIO.output(11,0)

                 time.sleep(1)

                 GPIO.output(11,1)

                  # save to log file

                  logging.info('Authenticated uid = %s' % uid)

else:

                 logging.error('Authentication failed uid = %s' % uid)