Hi there. I am trying to make a simple, self-resetting sand-drop door which activates after a player has submitted a "ticket" (paper, which I may replace with something else) to enter the train station. I have the generic 3x3 sand-drop door working and the item detectors set up... the only problem is that the single tick given by the item detector is not long enough to deactivate the door. Also, I do not have a way for the door to automatically push the sand back up after an X amount of time. I am not good with Redstone at all, so I don't know the easy fix, which I'm sure is obvious to all of you, to get this working. I do not want to rebuild the sand and piston mechanism, so I would like the resetting part of it to be connected to the item detectors. The picture below is what I have to far:
Pistons & Sand-drop Door
Item Detectors & On/Off Switch For Door
(The signal from the item detectors have to reach the underground torch to invert the signal to off and retract the pistons.) Supposingly, I can use state cells and one of the latches, but I don't know how to set it up. If someone could post a picture and/or explain how to do so, I would appreciate it.