30

There is no item actually called “Redstone Dust”; this is a colloquial name for the  Redstone item, because it has the appearance of a pile or trail of powder. If this is what you have, then you already have the “dust” and you can use it as you have seen discussed. If you have a stone-like block with red inclusions, then you have  Redstone ...


25

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 unpowered and then powered(but not updated): Here I updated the block by adding glass, then removed glass and power: Here I removed all the remaining blocks ...


20

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 graphs can be embedded in 3-space; so yes, Minecraft is Turing complete!


17

When the piston is not extended, the wire is cut and goes straight to the block beside the piston, thus powering it. So the piston extends... And the two wires get connected, so the wire no longer goes to the block, and the piston is not powered anymore, so it retracts. The cycle repeats, making a pulser. The concept of "blocks being powered" is quite ...


17

I have invented a solution to this problem using a mechanism to apply one tick of lava damage. It occurred to me that a tripwire could be placed immediately above lava in order to remove it (using a dispenser) as soon as a mob hits it, thus preventing the mob from continuing to swim in it. Doing this for the water as well as the lava means that no ...


17

taken from the Wiki: Flint is only obtainable by mining it yourself or exploding the gravel; making gravel fall onto a non-solid block (e.g. torch, sapling) does not produce flint. The best method I found when trying to farm bunches of flint is a shovel with fortune enchant. I believe fortune 3 gurantees a flint EVERY time. So I would just build a 2x1 or ...


17

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 Buttons Put down the iron door and place a button on an adjacent block to the door on both sides. When you press the button the door will open momentarily, ...


16

You can put a single bucket of water into a dispenser. When a dispenser "dispenses" an empty bucket, it actually "picks up" a source block in front of it. By putting a single water bucket in a dispenser, when it's activated once it dispenses the water and when it's activated again it removes the water. You can use this to make a button- or other restone ...


16

There are a number of methods for extending a redstone signal: Repeaters Just plonk down repeaters. Each one gives you another 15 blocks, however, there is a 1-tick delay in the signal for each repeater you use, which can slow down large circuits. Instant Wire This allows for instantaneous redstone transmission over long distances. There's a wiki page for ...


16

The pressure plate actually powers the block below it, so you can get the signal from below the block where the pressure plate is: There is no need to have any holes on the floor.


15

Sticky pistons can't move certain blocks, such as extended pistons. I'm guessing your second level of pistons aren't retracting early enough and are therefore not completing their retraction before the sticky pistons try to pull them. The likely solution is that you need to add a delay to your circuitry which allows the upper pistons to retract first, then ...


15

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 hopper is facing. So, in this picture, the items traveling along the hopper chain will be sucked into the one below. Note the middle hopper is not pointing down -...


15

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 around the cow. By placing the a cow in a place where pistons keep pushing the cow back you can make a proximity detector. This can be seen at: ...


14

You can make your device smaller if you replace the piston with a sticky piston and put it in place of the top torch. Put a block on it and you are done:


14

Yes, redstone lamps work well underwater, but light does not travel as far in water as it does in air; it falls by three levels per block it travels through, instead of one; so you might want more lamps so you don't lose the full light effect.


13

A redstone torch will burn out if it pulses (on then off) 8 times in 100 game ticks (5 seconds) The torch will come on again if it receives an update from either a block or a random game tick (which occur approximately every 30 seconds). However, you must wait until there have been less than 7 pulses in the last 100 game ticks before it can be turned on ...


12

The longest I can think out of top of my head? Fill the dropper with as many items as many days you want the signal to take. Near each noon the dropper will discard one item, for a max of 576 in-game days. If that's not enough, you can restock the dropper with a chain of hoppers and a double chests, and only when all the items are exhausted the signal will ...


12

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 (employing a simple daylight sensor), and you will have no rain.


12

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 blog post explaining why this is the case, but suffice it to say that pretty much every expert map maker limits their use of redstone dust to very specific edge ...


11

A simple pulse lengthener will work here. It works like this: The first block gets powered from the pressure plate (or you can power it in some other way), the redstone line immediately takes power from there, so all the pistons go up instantly. After some time the repeater draws power from the block and powers the next block, and so on... When you step off ...


11

You can vastly improve the performance of your times using MATHS. You can see the principle outlined in another answer (this answer deals with redpower timers, but the principle is the same, you just need to do it with your vanilla timers instead). All you need to do is set up multiple timers, like the one you have there, but with coprime numbers of ticks (...


11

Horizontal to horizontal (north to east, etc) Use the same design, but put a redstone torch under the "hotspot" where the blocks will be pushed towards. Horizontal to downward Note that the input can be received from either opposing side (and you can move either the "red power line" or the "white receiver line" if you want to two "inputs" to come at 90 ...


11

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 the cheapest, but you can also use obsidian. Top view: Everything covered up:


10

I'm afraid that any finite-sized redstone building (even in an infinite world) can only store as much bits of data as the amount of redstone put in it, therefore it's not Turing Complete. If you're talking about infinite-sized redstone buildings, well, you can quite easily build conway's game of life in minecraft, which is turing complete. The "quite easily"...


10

Use several clocks and an AND gate A clock that takes 7 ticks and one that takes 8 ticks will output every 56 ticks, using only 5 repeaters instead of 15. Using this method you can use 6 repeaters to get a 42s (420 tick) delay. You simply have a clock that takes 3 ticks (1), a clock that takes 4 ticks (+1=2), A clock that takes 5 (+2=4), and a clock that ...


10

This is a very compact solution. The torches on the right are the two outputs.


10

One of the most common ways to make a real random circuit is to create a very fast clock that quickly cycles through the possible outputs, which will stop as soon as a person pushes a button. If the circuit is fast enough, or hidden from them, then the exact moment they stop the circuit is sufficiently random to serve many applications. This can be ...


10

You aren't actually powering the raised block in this instance, because... reasons. That block is receiving power from the torch (and would do something if it were a redstone device), but you're not powering it, which sounds strange and contradictory, but that's the best I can explain it. More critically, you're not transmitting power to the block the ...


10

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 activates, it will be detectable by the comparator and will only produce a signal strength of redstone equal to the number of successful activations. Most ...


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