QR test

2016-12-28 08:41:34 +01:00
parent fec709d2ab
commit c70f3257f9
3 changed files with 57 additions and 1 deletions
@@ -0,0 +1,51 @@
+import RPi.GPIO as GPIO
+import time
+import subprocess
+import select  # see http://stackoverflow.com/a/10759061/3761783
+
+QR_SCANNER_TIMEOUT = 3
+
+
+# photo sensor on PIN 17
+GPIO.setmode(GPIO.BCM)
+GPIO.setup(17, GPIO.IN)
+
+# LED on PIN 27
+GPIO.setup(27, GPIO.OUT)
+GPIO.output(27, GPIO.LOW)
+
+try:
+    print('Start QR scan test')
+    
+    while True:
+        time.sleep(0.25)
+        if (GPIO.input(17) == GPIO.LOW):
+            #print('LOW')
+            GPIO.output(27, GPIO.LOW)
+        else:
+            print('Sensor active')
+            GPIO.output(27, GPIO.HIGH)
+            zbarcam = subprocess.Popen(['zbarcam', '--quiet', '--nodisplay', '--raw', '-Sdisable', '-Sqrcode.enable', '--prescale=320x240', '/dev/video0'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+            poll_obj = select.poll()
+            poll_obj.register(zbarcam.stdout, select.POLLIN)
+            
+            # wait for scan result (or timeout)
+            start_time = time.time()
+            poll_result = False
+            while ((time.time() - start_time) < QR_SCANNER_TIMEOUT and (not poll_result)):
+                poll_result = poll_obj.poll(100)
+                
+            if (poll_result):
+                qr_code = zbarcam.stdout.readline().rstrip()
+                qr_code = qr_code.decode("utf-8") # python3
+                print("QR Code: {}".format(qr_code))
+            else:
+                print('Timeout on zbarcam')
+            
+            zbarcam.terminate()
+            GPIO.output(27, GPIO.LOW)
+
+
+except KeyboardInterrupt:
+    print('bye')
+    GPIO.cleanup()