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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1answer
644 views

What is going on with these pistons?

I was messing around with pistons today, and I cam across this weird senario whhere they are not working as expected. I took some screenshots, they are Here and are in order. I have three pistons on ...
4
votes
1answer
56 views

Signal directing on lanes

I'm constructing a minecart trainstation and as you will have guessed, that involves 15 lanes of adjacent redstone wiring. In my station, there are many instances in which I need to power other lanes ...
4
votes
1answer
3k views

How can I make a functioning piston elevator in SMP

I've recently been trying to build a piston elevator in SMP from bedrock to the surface. However, every design I've tried (some of my own, and some from Youtube) results in me getting stuck in a block ...
4
votes
2answers
1k views

Powered rail not powering down

I've built an underground minecart track to allow me fast travel between two outposts. In the middle I've placed a powered rail, with a long redstone line to each post. I connected these two to a ...
4
votes
1answer
74 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
180 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
351 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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1answer
222 views

Determine Minecraft item type from entity or inventory?

I have a dropper which can contain, of course, any items. Assuming I can already target this dropper in a command's target selector, how can I determine what item is in the first slot of its inventory ...
4
votes
2answers
397 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
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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
1answer
122 views

Redstone circuit that activates on short pulse and does not activate on longer pulse

I made a circuit that activates on a long signal but I am missing one that activates on a short pulse and does not activate if the pulse time exceeds a certain pulse. Everything I made still activates ...
4
votes
2answers
418 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 ...
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
3k 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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votes
5answers
9k 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.
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
764 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
2answers
69 views

Please explain why this redstone minecart-loader works

See attached images. I am proud that I was able to build this tool to make a chest-minecart pause while it gets loaded from a hopper, and when the hopper is emptied, the powered rail beneath it powers ...
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
2answers
996 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
583 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
72 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 :( /!\\","color":"dark_red","...
3
votes
2answers
344 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
3k 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
112 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
1answer
44 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
256 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
15k 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 game!"...
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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
632 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
3answers
93 views

How do I create a repeating charge using redstone/repeaters?

Despite having some experience with Minecraft, the use of redstone is one thing that I never managed to get the hang of. I have no issue creating simple works such as redstone doors and other ...
3
votes
2answers
222 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 can'...
3
votes
2answers
273 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
8k 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
168 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
64 views

Stop Wolves From Becoming Angry Through Walls

In a custom Minecraft map I'm making, I have a pet shop where you can spend points you've earned on the main map levels to "adopt" pets. This includes horses, cats, and dogs. That's all fine. However, ...
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
votes
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
498 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 ...
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2answers
110 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
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2answers
267 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 second....
3
votes
1answer
295 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
732 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 ...