I've been building a number of redstone circuits lately, and to keep them protected I've been enclosing each entire circuit in obsidian. However, recently I noticed that a zombie managed to spawn in a dark 1x1x2 void within the redstone circuit. I fixed this by placing ceiling slabs to make these voids 1x1x1.5, too small for spawning.

Unfortunately, I came across a part of my design where I have a redstone torch in the top half of a 1x1x2 void, and a redstone wire on the bottom half. I can't fill the void in any way, and I'm afraid monsters can still spawn there. The only solution I can think of is to find a way to add another block of space to the 1x1x2 void where I can place a coal torch, keeping the light level in the void high enough to avoid spawning.

Are there any other tricks or design components that help keep redstone circuitry from becoming a breeding ground for baddies?

  • 12
    Keep them in the Shell instead
    – Zelda
    Commented Mar 26, 2012 at 18:34
  • 2
    @fredley: It can get noisy if you've got a bunch of zombies trapped behind your walls.
    – gnovice
    Commented Mar 26, 2012 at 18:38
  • 1
    @fredley - and they could be dangerous to troubleshoot if something goes wrong with the circuit!
    – user9983
    Commented Mar 26, 2012 at 18:49
  • 2
    Shouldn't this question be on stackOverflow? I usually see debugging questions there... Commented Mar 27, 2012 at 0:28
  • 1
    @LeeQuarella Zombies aren't a bug, they're a UX problem. :P
    – Zelda
    Commented Mar 27, 2012 at 15:29

3 Answers 3


You don't have to obstruct every area in your enclosed redstone circuits. You can easily place normal torches and/or Glowstone blocks throughout the enclosure. This will also aid in visibility within your ICs. Redstone can be placed on glowstone blocks, but they exhibit interesting properties, so be careful

Redstone can be put on glowstone, but being a transparent block signals can pass from one block to diagonally another with glowstone "blocking but not blocking" it, making possible nearly instant vertical redstone and new vertical logic gate designs.

  • Aha, glowstone! Very interesting. All the more reason for me to work up the nerve to go to the Nether. ;)
    – gnovice
    Commented Mar 26, 2012 at 18:56
  • @OrigamiRobot You are correct, Just tried it out in a 1.2.3 creative and it is back in again.. Comment removed :)
    – James
    Commented Mar 26, 2012 at 20:55
  • The ability to use glowstone as a block/component of the circuit and a light source could help keep my circuits both compact and spawn-proof. You get the check, sir. Now, on to the Nether!
    – gnovice
    Commented Mar 27, 2012 at 14:25

I suggest torches. Keep your circuitry well lit.

  • But part of the problem is that they don't have space to place anything...
    – Garrett R
    Commented Mar 26, 2012 at 23:33
  • @garrett That makes no sense, if there wasn't any space, there wouldn't be any mobs!
    – fredley
    Commented Mar 27, 2012 at 15:47
  • 1
    He also says why that's not true in his question. He has a place where there is redstone and a restone torch vertical to each other so he cannot place anything there because they take up the space of the block, but 1x2 mobs like zombies and skeletons can spawn there because the spawn coding in the game doesn't count items such as torches or rails or wire as a spawning obstruction. There has to be a block or light there. True he could just make a 1x2 hole in the wall for a torch but I'm just sayin'!
    – Garrett R
    Commented Apr 17, 2012 at 1:09

Well, Why use obsidian? It's just a pain to remove and no more protective from mob spawning than say, cobble or dirt... Also you could have an actual room lit with torches for your circuit instead of fully enclosing it in a shell.

  • 3
    The reson for using obsidian could be that you want to protect your circuits from creeper explosions.
    – Buhb
    Commented Mar 27, 2012 at 5:47
  • @Buhb: That's exactly it. Once bitten, twice shy.
    – gnovice
    Commented Mar 27, 2012 at 14:18
  • 1
    With w previous release and cheats enabled on your world, yo can keep creepers from griefing with /gamerule mobGriefing false
    – Timtech
    Commented Nov 2, 2013 at 23:18

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