import RPi.GPIO as GPIO
import time
import os
import subprocess

GPIO.setmode(GPIO.BCM)

GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_UP)

chiave= "Curreri Giuseppe"
           while True:
    input_state = GPIO.input(18)
    if input_state == False:
        print('Richiesta autenticazione')
        os.system("sudo fswebcam -d /dev/video0 -r 1024x768 -S 50 pic.jpg")
        qrcode = subprocess.run(["zbarimg --raw pic.jpg"],stdout=subprocess.PIPE,stderr=subprocess.PIPE,encoding="utf-8")
        varqr = qrcode.stdout
           if ( varqr == chiave ):
           print("Se va imposto GPIO HIGH per comandare arduino")
           else
           print("qrcode incorretto")
        time.sleep(0.2)

GPIO.cleanup()
exit