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)

RFID-RC522 on Raspberry PI (Python)

Enable SPI interface

Edit /boot/config.txt and add the following lines

device_tree_param=spi=on
dtoverlay=spi-bcm2708

Reboot  the device.

Install Python header files

sudo apt-get install python-dev

Install SPI libraries

git clone https://github.com/lthiery/SPI-Py.git
cd SPI-Py
sudo python setup.py install

Test RFID-RC522

Use the following schema to link the RFID-RC522 to the GPIO

Name	Pin #	Pin name
SDA	24	GPIO8
SCK	23	GPIO11
MOSI	19	GPIO10
MISO	21	GPIO9
IRQ	None	None
GND	Any	Any Ground
RST	22	GPIO25
3.3V	1	3V3

Download the RFID-RC522 interface and test it

git clone https://github.com/mxgxw/MFRC522-python.git
cd MFRC522-python
sudo python Read.py

Touching the reader with a card, the output must be

Welcome to the MFRC522 data read example
Press Ctrl-C to stop.
Card detected
Card read UID: 141,113,243,56
Size: 8
Sector 8 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]