gistfile1.py

    def _at_top_generator(self):
        """Introduce 5ms delay in readings and hysteresis for change in state"""
        
        pin = live_pins[self.name]['limit_top_pin']

        windowlen = 10
        window = deque(maxlen=windowlen)
        window.extend([True]*windowlen)
        state = True

        while True:
            gevent.sleep(.0005) #  5ms
            window.append(pin.read())
            
            if all(window):
                state = True
                
            elif not any(window):
                state = False

            yield state