ahome | Python Fiddle

#!/usr/bin/python
import RPi.GPIO as GPIO

GPIO_BEGIN_PIN = 4
GPIO_END_PIN = 17

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

GPIO.setup(GPIO_BEGIN_PIN, GPIO.IN)
	GPIO.setup(GPIO_END_PIN, GPIO.IN)

while True:	
	while GPIO.input(GPIO_BEGIN_PIN) == GPIO.LOW:
		time.sleep(0.001)
		start_time = time.time()
	end_time = 0

while GPIO.input(GPIO_END_PIN) == GPIO.LOW and time.time()-start_time < TIMEOUT:
		time.sleep(0.001)
	else: 
		if time.time()-start_time >= TIMEOUT:
			print "Timeout"
			exit()
		else:
			end_time = time.time()

speed = DISTANCE / (end_time - start_time)
			print "Geschwindigkeit: %.2f cm/s" % speed

while True:
  while GPIO.input(GPIO_BEGIN_PIN) == GPIO.LOW:
    time.sleep(0.001)
  
  zeit = time.time()
  print time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(zeit))
  # Skript(e) starten, versenden, etc.
  # ...
  
  # falls die Lichtschranke weiterhin unterbrochen ist, erst weitermachen, sobald sie frei ist
    while GPIO.input(GPIO_BEGIN_PIN) == GPIO.HIGH:
      time.sleep(0.001)

Browser Version Not Supported

Due to Python Fiddle's reliance on advanced JavaScript techniques, older browsers might have problems running it correctly. Please download the latest version of your favourite browser.
Chrome 10+ Firefox 4+ Safari 5+
IE 10+

Let me try anyway!

Python Fiddle

Python Cloud IDE