SimpleMFRC522 stop reading after some time

Question

My code stack after some time (example 1 day) after reading MFRC522 in loop mode. At the beginning it works without problems, after some time is not working anymore. I can't figure out why. Can you help me?

#!/usr/bin/env python

import os
import time
import RPi.GPIO as GPIO
from mfrc522 import SimpleMFRC522
import array as arr

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
pinList = [5,24,0,2,3,4,27,25]
rfidList = [1081714680121,871849641659,504025229752,275844158012,648722309022,118668796333,737282492797]
id  = 0

while True:
    reader = SimpleMFRC522()
    id, text = reader.read()
    print(id)
    if id:
        if id == 828191200458:
            for i in pinList:
                os.system("sudo gpio mode "+str(i)+" out")
            time.sleep(0.5)

            for i in pinList:
                os.system("sudo gpio mode "+str(i)+" in")
            time.sleep(0.5)

        for i in range(len(rfidList)):
            if id == rfidList[i]:
                os.system("sudo gpio mode "+str(pinList[i])+" out")
            time.sleep(3.5)
            os.system("sudo gpio mode "+str(pinList[i])+" in")
    GPIO.cleanup()
    time.sleep(0.5)

Thank You!

The link of MFRC522 is HERE

Answer 1

At a guess it is because the code runs out of memory.

The code reader = SimpleMFRC522() creates a new object every time around the loop. I suspect the old copy is hanging around in memory and not being garbage collected.

That line should be before the while loop.

Also the call to GPIO.cleanup() is almost certainly wrong and should probably be removed.