Database for NFC reader

[Sbs-ula]

Hello everyone

I have two raspberrys on different locations with NFC readers (RC522). They have the basic python program to open the door with one relay:

Code: Select all

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

import RPi.GPIO as GPIO
import MFRC522
import signal
import time
GPIO.setmode(GPIO.BOARD)
GPIO.setwarnings(False)
GPIO.setup(31, GPIO.OUT)
GPIO.output(31, GPIO.LOW)

continue_reading = True

# Capture SIGINT for cleanup when the script is aborted
def end_read(signal,frame):
    global continue_reading
    print " -- Beendet!"
    continue_reading = False
    GPIO.cleanup()

# Hook the SIGINT
signal.signal(signal.SIGINT, end_read)

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

def relay():
     GPIO.output(35, GPIO.LOW)
     time.sleep(2.4)
     GPIO.output(35, GPIO.HIGH)
     GPIO.cleanup()


# This loop keeps checking for chips. If one is near it will get the UID and authenticate
while continue_reading:
    time.sleep(0.1)	    
    # Scan for cards    
    (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)

    # If a card is found
    if status == MIFAREReader.MI_OK:
        continue
    
    # Get the UID of the card
    (status,uid) = MIFAREReader.MFRC522_Anticoll()

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

        if uid == [11,19,92,128,247]:
	    relay()
        elif uid == [26,4,150,12,22]:
	    relay()
        elif uid == [2,4,29,75,10]:
	    relay()
        elif uid == [1,4,0,3,23]:
	    relay()
        elif uid == [16,4,11,7,6]:
	    relay()
        elif uid == [11,4,15,9,30]:
	    relay()
        elif uid == [11,4,18,68,6]:
	    relay()
        elif uid == [16,4,5,13,6]:
	    relay()
        elif uid == [11,4,20,234,186]:
	    relay()
        elif uid == [11,4,3,73,13]:
	    relay()

        else:
            print "wrong tag"

You can see there are many if arguments and I have already shorted the list. And the same program work on the secound raspberry.

I think if I have one database (with sql or what else) on one server (maybe one of the raspberry), then can I manage it very better.

Have you any ideas for this problem?

[OutoftheBOTS]

Yes this is a classic example of where a database is needed. You make the data base with all the tags in it then when a tag gets scanned you look up the database to see if that tag is in it.

[DougieLawson]

There's some code I built at this weekend's Basingstoke Hackathon on github, it's not fully debugged, but it publishes MQTT messages when an RFID is seen by a reader. I've got a MySQL database in my design to hold card credentials.

https://github.com/DougieLawson/BSK_Hackathon

Our design has a funky addition that a "presence" event published from a card reader will trigger a music player.