42 votes
Accepted

Why isn't my sorting system picking up eggs?

Short answer: If you are trying to filter an item that has a stack size of 16 instead of 64, (like eggs, snowballs, signed books, etc.), then at 10:28 of the video, use 38 redstone dusts instead of 41....
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26 votes
Accepted

How does a redstone pulse generator work?

No, Minecraft is not hardcoding the pulse generator. There is a specific logical progression that makes this circuit make sense. Here are the steps that occur. On the first tick, the player activates ...
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25 votes
Accepted

Why are these pistons pushing?

You are experiencing quasi-connectivity. You have actually produced a BUD (Block update detector). The power source is the redstone line above. I have built an example to demonstrate. Here it is ...
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  • 5,616
23 votes
Accepted

Is Minecraft Turing-Complete?

I know this question is a bit old, but all the other answers seem quite complex to me, while the answer itself can be quite simple: nor gates are universal, redstone torches are nor gates, and all ...
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18 votes

How do I make a simple Redstone Door with a lever that villagers can't go through?

The most simple door that a villager cannot go through is an iron door powered by a button. If you need to use levers, you will need to build a simple XOR Gate. Buttons You will need: 1 Iron Door 2 ...
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  • 9,205
17 votes

Without mods, is it possible to filter items in hoppers/droppers/others?

To augment Slayner's answer, I've made a quick example in Minecraft. The way hoppers work is that they prioritize a hopper below drawing the item down over moving the item along in the direction the ...
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  • 3,358
17 votes
Accepted

How to make one wide tileable, vertical redstone in minecraft

In 1-tileable redstone either avoid dust like a plague or painstakingly engineer the power levels it emits. There are many techniques for transmitting signal in 1-tileable way, and using the best for ...
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  • 17.4k
15 votes

Hidden Pressure Plates

There are different kind of secret triggers in minecraft: Entity movement Living entities like animals and monsters can only move if a player is in a 32 block radius, this radius is a spheroidal box ...
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  • 476
14 votes
Accepted

Why remove redstone dust from my command block contraptions?

Your friends are right, redstone dust is evil and it should be avoided at all costs when making command block contraptions. Redstone dust does cause lag and it can be unpredictable. There's a nice ...
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  • 16.2k
13 votes

How do I make a rain detector on Minecraft?

You don't need one. There's this beautiful command called /weather clear. You can even specify for how long you want the weather to be clear. You can just run /weather clear 999999 each in-game day (...
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  • 32.8k
12 votes
Accepted

How do you turn off a redstone torch?

Power the block which the torch is attached to. It must be an opaque, solid, full block (so not glass, side of stairs etc; in particular glowstone and sea lanterns also count as transparent). You can ...
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  • 17.4k
11 votes

How can I randomise the output of a redstone circuit?

This question appears to be the main attractor for any and all questions involving creating a source of randomness in Minecraft, but most of the solutions are spread over related/duplicate questions. ...
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  • 7,531
11 votes
Accepted

Powering a Redstone Lamp on top of a Piston

In the latest snapshot of 1.8, this has become really easy. Here's a view of the redstone (the piston is sticky): Those furnaces have to be something that can not be pushed by a piston, a furnace is ...
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  • 616
11 votes

How do I make a command block output a Redstone signal when it is successful?

You'll need to use a redstone comparator and probably a repeater as well. A comparator will signal in the same fashion as it does for other non-inventory non-selector blocks; when the command block ...
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  • 1,216
10 votes

How do I make redstone repeaters work?

The first thing you want to do is make sure that the repeater is in range. A single redstone current travels 15 blocks, so as long as the repeater is placed within that range, it will work. ...
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  • 39.9k
10 votes
Accepted

Is it really possible to get to the End City without killing the Ender Dragon like in this video?

Appearently, it's possible to do this. But I wouldn't recommend because of the following reasons: It's too far. According to the video, the other End islands are about 1,000 blocks away. Use it at ...
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  • 4,156
10 votes

How do you make an item frame turn activate a redstone source?

Item frame rotation based output. This is not my design. The item frame does not rotate, an item in the frame does. Some items have to be rotated fully twice(example: maps) in order to output ...
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  • 5,616
10 votes

How to halve redstone signal strength?

I built a gigantic complex circuit that converted signal strength to time using comparator fadeout and then back to signal strength using locking repeaters, then I built a simpler circuit based on ...
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9 votes

Is it possible to modify this Minecraft contraption to make the cart leave if it is full?

My solution isn't the prettiest, but it works. First, a full minecart on top of a detector rail with a comparator emits a signal strength of 15 (Full cart - 1 item emits 14). We can also subtract ...
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  • 1,296
8 votes
Accepted

How to make 20 minutes (1 day) delay?

You could accomplish this with 2 hopper clocks chained together. In 20 minutes there are 24000 game ticks, and an item takes 8 game ticks to transfer from one hopper to another. This means that the ...
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  • 27.8k
8 votes
Accepted

Most compact way to connect pressure plate and piston

If you have sticky pistons, this type of wiring is pretty compact:
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  • 7,657
8 votes

What is the point of delays on redstone repeaters?

The delay just increases the time for the propagation of a redstone signal which can be anywhere from 1 to 4 redstone ticks. A redstone tick is defined as: A redstone tick describes two game ticks....
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  • 2,024
8 votes
Accepted

Trouble making a 5 x 6 wall of redstone lamps

That's not possible with lamps in the corner The problem, as I am sure you are aware, are the corner blocks. Take a look at a two high section: To light up the corner blocks, we need to power an ...
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  • 17.1k
8 votes
Accepted

minecraft item frame not outputting redstone signal when item turned

You have to put the comparator behind the block with the itemframe on it:
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  • 1,130
8 votes

How do I use redstone repeaters to stretch the redstone limit?

Add more than one redstone repeater. A redstone signal will only stretch for 15 blocks before disappearing, so add multiple repeaters to extend the travelling distance of the signal to the pistons.
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  • 7,033
8 votes
Accepted

Toggle redstone circuit

It looks like you need a memory circuit. You can face two droppers into eachother. The pressure plate powers the first dropper, the button powers the second. You need 1 item inside one of the droppers....
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  • 1,744
8 votes
Accepted

Does redstone work on stair blocks?

Yes. Although you can place redstone on upside down stairs, stairs can't power any adjacent blocks. You'll have to use a full block. You experience the same behaviour when you use glowstone or slabs ...
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  • 1,744
8 votes
Accepted

Powering an offset stacked array of pistons

Something like this? It can be powered and extended until the redstone limit.
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  • 1,264
8 votes
Accepted

Is it possible to modify this Minecraft contraption to make the cart leave if it is full?

This is a nice, compact, simple setup that works most of the time. In particular, it will send the minecart away when the bottom hopper is empty (meaning the farm ran out of items) or when the cart ...
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  • 17.4k
8 votes
Accepted

How to break a sand block without touching it in Minecraft?

Frits34000 and a couple other redditors for a good while worked on 'sand quarry' machines - you can find the assorted designs on r/redstone. The gist of it is to lift the sand block using a sticky ...
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  • 17.4k

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