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I made a little redstone circuit to open a door (using pistons) with a button, but I was wondering how I could make the door stay open a little longer. I don't want to use a lever as I want it to close automatically after.

I thought of running parallel redstone delayers, with gradual delays, but I wanted to know if there is something more compact?

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FYI answer below works in 1.8. Also, if doors just stay open, the delay line isn't long enough. For me, the hardest part was routing the delay circuit so it didn't interfere with the opening circuit. –  Chris K Oct 27 at 19:18

2 Answers 2

up vote 22 down vote accepted

The words compact and Redstone don't usually go together :) There could be something simpler than this, probably using some weird combination of water, pistons, and chewing gum, but this is the best I can come up with: a basic delay circuit (from the wiki):

redstone circuit diagram minecraft screenshot

In the screenshot, there is actually a pressure plate on the right, bit hard to see. I prefer not to use buttons, when running for my life. :)

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Thank you :) I'll use that! –  MadJawa Jul 30 '11 at 13:34
3  
@MadJawa, you're welcome, glad it helped. One minor point - I personally, usually wait a day or so before checkmarking an answer, to see what shows up. Be aware if a better answer shows up (it could happen :) , you can move the checkmark to it. –  Cyclops Jul 30 '11 at 13:37
    
Wups - diagram was missing one redstone wire on the ground (although it's visible in the screenshot) - fixed. (Also rotated it to match screenshot). –  Cyclops Jul 30 '11 at 13:52
    
upvote for "chewing gum". (okay actually for in-game screenshot, rotating redstone layout to match, and taking the time to ensure completeness... i guess "chewing gum" just made me comment!) also, when running for your life, pressure plates won't save you... they react to mobs also. –  EdGruberman Jul 30 '11 at 21:19
    
Heh - thanks for the upvote, and comment, @EdGruberman. And yeah, I know mobs can use pressure plates, I just happened to build my test circuit with a plate a while back... I do put a plate just inside my doors, though, so they close when I run through. And you could use an external pressure plate - you'd just need to connect it to an RS-NOR + AND-gate circuit instead of the door. Connect the AND output to the door, and you have a single-use pressure plate, that doesn't re-activate until you toggle the RS-NOR from inside... –  Cyclops Jul 30 '11 at 22:15

If you need a really long delay, you can use my personal favourite design, created by Minecraftaddict.

enter image description here enter image description here

This circuit is featured in this video of his. I think the design is nice because you can make the delay a lot longer, simply by extending the part with repeaters. Unfortunately, this circuit does not involve chewing gum either.


Also, in case anybody else who visits this question needs a very long delay, here is another circuit that provides an even longer delay (this is probably the most delay you'll ever need):

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Just to note the obvious, the design I posted can also have a longer delay, by adding repeaters on the left edge (and moving the connecting redstone wires further). –  Cyclops Jul 31 '11 at 12:16
    
I guess my answer wasn't phrased very well. What I meant to say was this design creates a lot of extra delay per repeater added – more than traditional pulse lengtheners. –  Kevin Y Jul 31 '11 at 17:22
    
Could be, I'm not up on traditional pulse lengtheners :) But this design is conceptually similar to the design I posted - in the video, he states that it uses an RS-NOR latch (just a vertical version). Although the more compact latch allows for two more repeaters on the top edge than my posted design - if I extend my design to the left, it would add the same delay factor as extending this one. –  Cyclops Jul 31 '11 at 19:34
    
@agf, my comment was referring to the first design - the second delay circuit/video (which I presume you mean), was added a month after my comment... :) –  Cyclops Nov 7 '11 at 15:44
    
@Cyclops My mistake :) –  agf Nov 7 '11 at 16:03

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