tilman
52 lines
1.5 KiB
Python
52 lines
1.5 KiB
Python
import RPi.GPIO as GPIO
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import time
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import subprocess
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import select # see http://stackoverflow.com/a/10759061/3761783
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QR_SCANNER_TIMEOUT = 3
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# photo sensor on PIN 17
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GPIO.setmode(GPIO.BCM)
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GPIO.setup(17, GPIO.IN)
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# LED on PIN 27
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GPIO.setup(27, GPIO.OUT)
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GPIO.output(27, GPIO.LOW)
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try:
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print('Start QR scan test')
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while True:
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time.sleep(0.25)
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if (GPIO.input(17) == GPIO.LOW):
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#print('LOW')
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GPIO.output(27, GPIO.LOW)
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else:
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print('Sensor active')
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GPIO.output(27, GPIO.HIGH)
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zbarcam = subprocess.Popen(['zbarcam', '--quiet', '--nodisplay', '--raw', '-Sdisable', '-Sqrcode.enable', '--prescale=320x240', '/dev/video0'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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poll_obj = select.poll()
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poll_obj.register(zbarcam.stdout, select.POLLIN)
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# wait for scan result (or timeout)
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start_time = time.time()
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poll_result = False
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while ((time.time() - start_time) < QR_SCANNER_TIMEOUT and (not poll_result)):
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poll_result = poll_obj.poll(100)
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if (poll_result):
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qr_code = zbarcam.stdout.readline().rstrip()
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qr_code = qr_code.decode("utf-8") # python3
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print("QR Code: {}".format(qr_code))
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else:
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print('Timeout on zbarcam')
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zbarcam.terminate()
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GPIO.output(27, GPIO.LOW)
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except KeyboardInterrupt:
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print('bye')
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GPIO.cleanup()
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