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

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Trouble making a 5 x 6 wall of redstone lamps

I am trying to make a 5 high by 6 wide cube of redstone lamps to work all at once but I'm having issues getting them to work. They need to be wired so that you can turn them on and off with a clock. ...
5
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2answers
768 views

How can I make a S/R latch with adjacent inputs?

The Minecraft wiki suggests this: ...with this being the key to the diagram. The way I read it, the set and reset wires run into two blocks. On the opposite side, put a torch on the set side, ...
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1answer
252 views

Why remove redstone dust from my command block contraptions?

Whenever I show my command block contraptions to my friends, they always comment that I should remove the redstone dust from them. They say it causes lag and that redstone can be unpredictable, but ...
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1answer
2k views

How do I make a “Rotary hopper clock”?

I'm working on a project that requires a fairly long delay. I found the "Rotary hopper clock" on Minecraft 101, and I do like the compact design it has to it. However I'm not entirely sure how it ...
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4answers
412 views

Redstone avoid propagation upwards

I'm trying to create an elevator, but I'm stuck at powering them. I have inputs for each piston, but I can't seem to separate them. It seems that the redstone powers the block beneath it, and all 3 ...
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2answers
3k views

How can I make a redstone button with an X second delay?

I am making a grinder that kills you with lava, water, TNT and sends you into the void. I am having some trouble with the lava. Since lava flows really slow, I need a button that has a delay from 5 to ...
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3answers
2k views

Behavior of a JK flip-flop (Minecraft Redstone circuit)?

I've built a JK flipflop - specifically, the A version, from Redstone JK flip-flops - and it works - sort of. It doesn't behave as described in the wiki, and I'm not sure if the wiki description is ...
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1answer
2k views

Hopper Timer only exchanges one item?

I've been using "hopper timers" to create long delays for some automated harvesters, using what seems to be a pretty standard method with comparators. So far this has been working well. But for the ...
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3answers
373 views

Piston is destroying track

I have been following a tutorial on youtube regarding building a minecart station. Now I have had no issues whatsoever until I hit the cart loading section unlike in ...
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4answers
1k views

How to store big variables in a redstone RAM memory?

I've just made a simple RAM memory in Minecraft (with redstone), with 4 bits for the address and 4 bits stored in each cell. Our next goal is to store different kinds of variables in it and to process ...
5
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1answer
846 views

How to make a tree miller

Tree milling There are plenty of videos about already done tree miller. But none explain how to build one. I'm currently trying to create one and share it with you once done but I'm stuck. What I ...
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1answer
94 views

How do I make the time between dispensers longer and random?

I have five dispensers shooting out chickens (it's for a minigame). I've been trying to figure out how to make them drop randomly and not so fast. The image below is my current set up... As you can ...
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2answers
746 views

Error with Double-Dabble decoder

I'm using a Binary to BCD system using this double-dabble decoding device. It all seems pretty good, but it doesn't work properly. If you are unfamiliar with double-dabble, it should take an input, ...
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2answers
2k views

How can I teleport to an unloaded entity?

I am using invisible invulnerable ArmorStands to create "warps" and "homes" in a map. The idea is that I can spawn them in with a specific name, and then teleport a player back to them like this: /tp ...
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1answer
59 views

Minecraft execute tellraw's clickEvent from original entity, not player

I'm using a command like this: /execute @e[type=ArmorStand] ~ ~ ~ tellraw @a[score_goto=-1] { "selector": "@e[type=ArmorStand,r=1]", "clickEvent": { "action": "run_command", ...
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2answers
6k views

When do redstone torches burn out?

I know that if I make a redstone circuit that switches too often, my redstone torches will 'burn out' and stop working. Under what circumstances does this happen? Will a slow circuit eventually burn ...
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3answers
663 views

How do I make a rain detector on Minecraft?

I am making a server and it rains a lot. Rain lags up my computer so every time this happens, I have to type in /toggledownfall. Is there a way to make a simple redstone creation that detects rain, ...
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3answers
6k views

What is the exact time on Minecraft that is sunrise?

What time does the sun rise on Minecraft? I would like to know because I am building a map where it needs that time for the map. By this I mean when the sun creates a purple color in the sky.
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1answer
15k views

how do you make commands not show up on the chat

I am making a server, and I put a comparitor clock down to constantly have clear weather. How do I silence the commands?
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3answers
3k views

What is the command to make a command block emit a redstone signal after 20 mins

How can I make a command block emit a redstone signal after 20 mins. I want it to emit a redstone signal after 20 mins to power another command block that will have /tp to send all players to a ...
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2answers
7k views

Extend Pistons By Default in Minecraft [duplicate]

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 ...
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3answers
5k views

How can I change a pulse into a state?

Is there a logic gate that changes a pulse into a steady state?
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2answers
158 views

How do I create unbreakable blocks?

I am creating a map on Minecraft, and I want the players to break certain blocks like trees, but I don't want them to break other blocks like stone bricks. Is there any command that can help me?
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4answers
61k views

How do I use the /kill command to ONLY kill mobs?

I have a Redstone Power loop that connects to a Command Block that is set to kill all entities except for myself (/kill @e[type=!Player]), because I'm building a creative map, but don't want slimes ...
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3answers
1k views

Best way for connecting this redstone vertically?

i am currently working on a big RAM in minecraft and i want to connect the inputs of each row vertically: I want to connect the yellow lines. It should be fast not use too much space.
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3answers
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How can I connect a field of pressure plates to a single output?

I have a large flat area covered in pressure plates (30x70) and I was wondering how I might wire them from beneath to detect if a mob or object has touched ANY of them. I guess I could cope with a few ...
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2answers
109 views

Most compact way to connect pressure plate and piston

I am trying to make a mob spawner trap with instant fall to lava lake. The actual thing I need to connect is (the block below piston isn't needed): I figured out double negation connection with ...
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1answer
2k views

Activating one piston while deactivating another at the same time?

I just wondered if it is possible to activate one piston while deactivating another (activated) piston with the same lever. The idea is to pull some blocks into the wall while other blocks are pushed ...
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1answer
3k views

How do Minecart with Hoppers work?

The Minecarts with Hoppers are very confusing and after looking into Minecraft wiki page I couldn't find an answer on how I should use the hoppers. What are some of the uses for Minecarts with ...
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2answers
2k views

How do I create a redstone circuit whose output depends on it's previous input?

I have two inputs, A and B, and I want them to perform as so: |------------|-----------|--------| | Prev State | New State | Output | | A B | A B | | ...
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1answer
306 views

Creating Quests with Command Blocks: Problem Testing Unset Objectives

I've got a Realms server, and I'm trying to create a series of quests that people can complete to up their overall "Defender of the Realm" score. However, I only want them to be able complete each ...
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1answer
145 views

How can I detect if a person takes fall damage?

I am trying to make a command block creation that when you take fall damage, it gives you an effect. I am not using any of the methods that detect for air -1 meter of the player ( 1 , 2 ) because ...
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2answers
131 views

Help with auto Punkin farm/melon

I want to build this (Punkin/melon farm) on my world but I want to build a huge tower of it but I don't know how I can transport the items down to a chest without using more than a 100 (example) ...
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4answers
391 views

Reverse Timing using redstone

I am looking to reverse the timing of redstone for an airlock system I'm building. I have tried using ABBA and ABAB switches, but to no avail. I would like it to work as follows; -- Stage 1 -- Inside ...
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1answer
1k views

What is the actual “spread speed” of water and lava in the context of a stone generator?

I'm currently experimenting with stone generators, e.g.: I'm having problems figuring out what speed of pulse do I need to provide to the piston in order to maximize the speed of stone production. ...
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1answer
350 views

Redstone loop not working

After building and exploring in Minecraft, I chose this sticky piston mob grinder to learn about redstone - which may have been a bit too ambitious, as I'm having problems with the loop which sends ...
4
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1answer
606 views

How to simulate polyhedral dice in Minecraft?

A dispenser can simulate dice of up to nine sides by random choice, and there are redstone circuits for simulating six-sided dice. But how do you simulate, say, ten-sided, twelve-sided or twenty-sided ...
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1answer
2k views

unpowered but extended pistons that only retract when there is a block update

Thanks guys for answering my previous question. I have some follow up on it. I did mentioned that I have changed my enderman farm design since then and have new problem with it. So here is the ...
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1answer
257 views

Is redstone deterministic?

In circuits not using pseudo-random 'dice-roll' type randomizers (i.e. a fast clock that the player stops to produce a random state), is the output state always the same for the same input state?
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1answer
643 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 ...
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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 ...
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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 ...
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1answer
167 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?
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1answer
364 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 ...
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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 ...
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3answers
96 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 ...
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2answers
170 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 ...
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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
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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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1answer
181 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 ...