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I'm working on my first redstone structure, so it's extremely simple. It's a secret entrance to my base, and it's just two horizontal stickypistons, one of top of the other, that extend one piece of dirt each when the button is pushed. What I'd like to have it do is the opposite though, to retract a piece of dirt each when a button is pushed. Is there a way to do that?

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Could you add pictures. –  mrminecraft3000 May 21 '12 at 20:55
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2 Answers

up vote 11 down vote accepted

Just invert the redstone signal. This is as simple as having a redstone torch placed on the side of a block.

http://www.minecraftwiki.net/wiki/Redstone_Circuits#NOT_gate_.28.C2.AC.29

"On" becomes "Off" and vice versa.

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In a line: 
W R B T

Key:
W = wire
R = repeater
B = block 
T = torch

Keep in mind torch must be on side of block not ground

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no need to add a repeater here. –  alexanderpas Jul 15 '12 at 12:11
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