Questions about redstone contraptions and machinery in Minecraft. For command block contraptions, use [tag:minecraft-commands] instead.

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4
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66 views

System with multiple inputs, but when one is activated it disables the other inputs

I am currently working on a bank system. However, it cannot accept multiple inputs at the same time (through multiple ATMs). So I made it so that every ATM will output a signal when a user has ...
4
votes
3answers
151 views

Detect broken blocks that don't drop items

I'm trying to make certain aspects of survival more "painfully realistic" using command blocks. One of those things is that I'd like mining through stone (or other hard objects) with your bare hands ...
4
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1answer
270 views

minecraft /Testfor players looking at specific block?

Is there a /testfor command where if players looked at a certain block it will detect it?
4
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2answers
386 views

Command Blocks vs Bukkit Plugin, Performance?

I am currently building an open world minecraft adventure map, primarily focused around compatibility for public multiplayer minecraft server. I would like to create events such as; spawning mobs when ...
4
votes
1answer
1k views

How can I make a reliable and compact random timer?

I need to make a reliable random timer that powers a redstone wire and that is as small as possible. It should send about a pulse every second or half second, but obviously be slightly varied. It ...
4
votes
2answers
350 views

Redstone circuits in spawn chunks in Minecraft SMP and no players online

I tried to search this question, but it seems to be rather specific. The problem I have is the following: We have a small SMP server in Minecraft and I set up an iron golem farm according to ...
4
votes
2answers
2k views

Trail of particles from a point to TNT

I have a map where I spawn Primed TNT then teleport it to a random Mushroom Cow which is invisible to make 100% random explosion. Now I want to make a particle trail from an orb kind of block in the ...
3
votes
2answers
2k views

Redstone Circuitry - Resistors?

Is there any way to construct a resistor within a redstone circuit? I was thinking that there might be some properties of cobblestone versus glass, dirt versus obsidian, etc. but I haven't had the ...
3
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4answers
2k views

How can I check if a player is in the air with /testfor?

I'm interested in negating fall damage with command blocks by giving players Resistance as they're falling. How can I use /testfor to tell whether a player is on the ground or in the air?
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5answers
8k views

How do I make a 1x1x2 piston door that opens when I step on a plate and not the other way around?

In Minecraft I need to make a piston door that opens when a plate is stepped on, it is normally the other way around. Does anyone know how? A video would be helpful but not required.
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votes
2answers
60 views

How to stop fire from going out without netherrack

I want to set a hopper on fire on Minecraft, but I don't know how to keep it burning. Any ideas? (I'm not good with commands)
3
votes
1answer
182 views

I want to be able to make a three person winners circle

I basically want three people to stand on three different pressure plates. I want them to somehow all connect in a way that when they are all activated it sets off TNT. I don't want the TNT to set of ...
3
votes
1answer
732 views

What do noteblocks do?

I have been playing Minecraft for some time, and am pretty good with redstone. However, I was spamming the Random Page link on the Minecraft wiki and came across the Note Block page. Of course, the ...
3
votes
2answers
2k views

How can I make automatic lighting in Minecraft?

I have been trying to create a redstone system for my "town" on multi-player and was using some guides on creating automatic lighting using redstone, water, and pistons, but it is not working properly ...
3
votes
1answer
262 views

How to /testfor 10 wheat [duplicate]

I am trying to /testfor 10 wheat anywhere in the players inventory. I have tried this command: testfor @a {SelectedItemSlot:0,Inventory:[{Count:10b­,id:minecraft:wheat}]} But it gives me this same ...
3
votes
1answer
60 views

How do I do a /setblock for under a player?

I'm trying to make a vanilla spleef arena, with a redstone clock attached to a /setblock command. No matter how I tried, I could not get the command to set the block under the player air. this was the ...
3
votes
2answers
776 views

Why does extended piston become stuck if air above it is powered?

To reproduce this problem make layout like this and then power the piston. Once the piston is extended, removing the power source will not retract it: Since piston head block is transparent, I see ...
3
votes
2answers
582 views

Why do two identical redstone contraptions not do the same thing?

I was experimenting with redstone manage to build the first example were everything works thine. I've built the exactly same thing in my building but there it won't work any ideas why? (the delay is ...
3
votes
2answers
336 views

What's wrong with my command? (might be me or a bug)

So I have this simple setup to show what the problem is: this command block checks for a quartz block above it: this one checks if the left command block's previous output is true: But then when ...
3
votes
2answers
2k views

Redstone rendering far away from player

When I create really big circuits and I go some distance away, the redstone mechanisms stop working and freeze. And if I come back they are still frozen. I have to click on a wire or repeater and ...
3
votes
1answer
105 views

How can I test for a totally empty inventory

I am making a custom Minecraft map in which I need to /testfor if a player has a totally empty inventory. I tried Googling but I didn't get any results. So if anyone can help me by providing suitable ...
3
votes
2answers
53 views

The title command in a execute command

I can't use a /title command in a /execute command. Like this: /execute @a[score_Health_min=0,score_Health_max=1] ~ ~ ~ /title @a title ["",{"text":"/!\\ You Died :( ...
3
votes
1answer
37 views

What Specific Blocks are needed for Turing Completeness?

Let's say I want to make a shop with all the redstone components required for Turing-completeness. Since we know Minecraft is Turing-complete, what are the basic blocks required? Ex: Comparators might ...
3
votes
3answers
238 views

How to make a Pulse only activate on the second time activated?

I've hit a problem while making a map. I want one command block to activate on the the first pulse but another when I hit the button a second time. If there are any Redstone pros out here then could ...
3
votes
3answers
14k views

Is there a way to display a player name in /tellraw command?

like the title says, I'm looking for a way to display a player name in a /tellraw command which is run by a command block. Example: /tellraw @a {"text":"","extra":[{"text":"A player has won the ...
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votes
2answers
2k views

I need to be able to press a button multiple times but only have one output

I want a button that, when pressed five times, outputs a signal. What redstone device should I use?
3
votes
1answer
622 views

Is there a new fix to restart redstone clock

I think everyone in this section knows about redstone clocks, and that sometimes when you log in and out, the repeaters get stuck. Sometimes they get stuck when you are just a little but far away or ...
3
votes
2answers
114 views

How to detect if a mob has been hit in minecraft with command blocks?

i am making a boss battle for my minecraft adventure map, and using a mob spawned with commands as the boss. When the mob gets hit, some command blocks will give the player a potion effect, but I ...
3
votes
2answers
185 views

why will my hopper not move items to the next hopper?

I have one hopper connected to the other, and the other to a chest. I know I have them connected correctly, because the second hopper deposits into the chest perfectly. However, items do not transfer ...
3
votes
1answer
96 views

What tick is right before 0? [duplicate]

I have tried using /time query daytime to find out an estimate but I am trying to make a redstone Calendar and I need to activate it right before daytime tick 0 so I can restart the Tick Counter. ...
3
votes
1answer
1k views

Automated Crop Farming

I am wondering how would I automate this underground farm so I can flick a lever and have it all collected by water like for Sugar Cane and Wheat or Pistons for say Pumpkins or Melons.
3
votes
1answer
7k views

How to testfor blocks not people

how do I testfor blocks? like if I put down stone near a command block with a comparator attached to it and it will activate a piston connected by the comparator on the command block? please answer.
3
votes
1answer
166 views

Is there a way to guarantee every block is collected in info obsidian?

I have an info obsidian farm, which I'm trying to set up to AFK. Unfortunately, I seem unable to guarantee every mined block is picked up by my hopper system. In the image below, I have a minecart ...
3
votes
3answers
5k views

How do I move redstone signals vertically (for a vertical sticky-piston door)?

I'm trying to make a variation on the sticky-piston hidden door, in which two sticky pistons are activated by a pressure plate in a corridor to reveal either a hidden room, or a treasure chest, or ...
3
votes
1answer
2k views

How do I make a pulse generator in minecraft Xbox 360?

Previously, I tried hooking up a "rapid pulser" to some dispensers, but it failed miserably (never lasted for more than 2 or 3 seconds) so I decided to try out a 1 tick "repeater clock"hooked up to ...
3
votes
2answers
2k views

How to delay an input for a short while after it turns off?

I want to make a redstone device that prevents an input from turning on, then off, then on again very rapidly. For example, if a player turns a lever on, it should update instantly. However, if they ...
3
votes
1answer
2k views

Exactly how do the contents of a furnace effect a comparator?

Can someone tell me how the contents of a furnace affect a comparator? I want to create some automation in vanilla Minecraft, but don't know how the mechanics work.
3
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2answers
2k views

How can I control a tower of redstone lamps?

So I think this is slightly related to this question but I'm not sure I fully understand the rules controlling lighting redstone lamps. Say I have a tower like this: Right now, I can light it up ...
3
votes
1answer
1k views

What is a self-propelling “working” piston mechanism called?

In anticipation of the Redstone Update, I've been experimenting with this type of "wormhead" piston configuration lately: or: PSXXXXSP where P = normal piston, S = sticky piston, X = anything . ...
3
votes
1answer
483 views

How can I hold 256 bits of memory in Minecraft?

I need to build a type of memory that can hold 256 bits of memory, including on's and off's but it seems like the only way to do it would be with hundreds of RSNOR latches and I was just wondering if ...
3
votes
2answers
234 views

How can I get redstone working again?

I am making a huge zombie siege map with tons of redstone. Just recently, I tried to make a comparator clock to activate a command block. Instead, It only turns on and off about once or twice a ...
3
votes
1answer
282 views

Where is there a key to the different redstone circuit notations used on the minecraft wiki?

There are lots of schematics of minecraft circuits online, but few of them reference the notation they are using and I am finding it hard to chase down what some symbols mean. The page on Advanced ...
3
votes
1answer
718 views

How can I make a reliable piston door?

My friend has a "empires" world and my castle is located on the water. I need a piston door that a boat can fit through with out breaking. Currently, I use a 2x2 piston door. (keep in mind the boat ...
3
votes
2answers
103 views

Minecraft, random number generator?

Does anyone know how to modify that random number generator, so that it will get only one lamp on? I can't use command blocks.
3
votes
1answer
211 views

Why won't this redstone and command block setup work like the other one?

I'm trying to make an RPG adventure where the player can interact with different stuff. For example, if he walks up to a crafting table, then this text should come up in chat: [Robert:] I wish there ...
3
votes
1answer
124 views

Command Blocks and Redstone Comparators

So I am giving Command Blocks a first try and I've found that with the comparator you can make it so it perceives a player is near them (and of course if you use the [r=x] tag. The scenario I am ...
3
votes
1answer
832 views

Is it possible to make piston flying machine that bounces?

I allways dreamt about making a piston device that can push itself. Now, with the addition of slime blocks, my dreams came true. The only flaw of these machines is that they work until they hit some ...
3
votes
1answer
238 views

How to create a display

I am trying to create a msg display for a friend in Minecraft. The display works with 2x2 "pixel". However, I cannot come up with a way to make the 2x2 pixel light up, in a repeatable, stackable ...
3
votes
2answers
418 views

Will this Instant Repeater design work reliably?

I'm currently looking into the mechanism of redstone in minecraft. For one circuit, I need an instant repeater, and reading Minecraft wiki, the smallest one so far is the 4x5x3 instant repeater by ...
3
votes
1answer
1k views

Redstone torch not working in Minecraft beta 1.1_02?

Torches seem to be stuck ON all the time. Given SrrTrr (Switch, redstone, Torch) the torch and all the redstone are lit regardless of the position of the switch. Removing the torch shows the ...