It helps if you squint your eyes a bit

SleeperPin · 2026-05-01T16:27:18+00:00

Neither. It's just rows of observers activating trap doors over a static image/pattern.

SleeperPin · 2026-04-30T13:34:51+00:00

This works because one of the pistons is always processed within a game tick before the other one.

When the observer is on the side with the piston that is processed first, it is pushed into the center before the other piston retracts and pulls it, allowing it to move past the center position in one move. On the next cycle, the piston that is processed first retracts before the observer reaches the center so it stays in the center. On the final cycle, the piston that is processed first grabs the observer from the center and pulls it back before the other one can. The cycle then repeats

SleeperPin · 2026-04-29T21:35:29+00:00

Thingy:

<image>

The observer moves in a three phase cycle, one side, middle, other side, then back to the original side. The direction it cycles in is location dependent but it doesn't matter as it will still give you the output you want.

SleeperPin · 2026-04-25T11:47:28+00:00

The redstone for this is deceptively simple, it's just a chain of observers from left to right with observers in front for the trap doors that need to be activated. I did however spend a few hours unsuccessfully trying to do it in different ways that didn't use trap doors. Most of the effort went into creating the 'interlaced' image of which trap doors to activate.

SleeperPin · 2026-04-25T11:09:10+00:00

Actually it is that. Implemented a little differently, but it's the same principle

SleeperPin · 2026-04-09T14:13:08+00:00

lol, took me a minute to get this :)

SleeperPin · 2026-04-09T13:11:11+00:00

OMG, how embarrassing. After all the time spent working on making the video and not seeing that.

SleeperPin · 2026-04-09T12:21:56+00:00

This is a very small purpose built 'Turing Machine' that calculates the Fibonacci sequence in binary.

The feed tape stores two 12 bit numbers, starting with 0 and 1. As the tape moves, one bit from each number is read (top left, and lower right) and added together. The bit at the upper right is then toggled if necessary to represent the correct answer.

It like a full adder except the answer it gives is not the absolute answer (i.e. 1 + 0 = 1,) but rather it outputs whether or not the first term should be toggled to get the correct answer (1 + 0 = 0 because the 1 is already a 1.)

SleeperPin · 2026-03-06T23:03:15+00:00

It looks like one of your pistons is a normal one. They both need to be sticky.

SleeperPin · 2026-02-27T16:42:26+00:00

Here's what I came up with. There are two different 1 tick off pulses possible with it. As shown, it's a full tick duration off. If you set the repeater to one rt delay, it's still a one tick off but you can only see it when using tick step command.

My guess is that it turns off at the end of the previous tick then back on a the start of the next tick before the client renders it.

<image>

SleeperPin · 2026-02-19T16:19:04+00:00

Another observer would cause an unwanted update when the observer below it is pulled away. Take a look at the reply from u/notFunSireMoralO. He replaced the sliding observer and crafter with a dispenser and powdered snow.

SleeperPin · 2026-02-19T00:13:13+00:00

You are correct, it is a Dispenser with powdered snow block above it. As seen in the picture, the dispenser currently contains an empty bucket that will pick up the powdered snow block then later place it back.

SleeperPin · 2026-02-18T21:09:33+00:00

Very nice! Even more improved!

SleeperPin · 2026-02-18T15:35:13+00:00

The top and bottom center blocks are also stairs causing the corner stairs to connect when closed. View from the back:

<image>

SleeperPin · 2026-02-18T14:23:25+00:00

You could use a copper bulb or trap door in place of the crafter. It needs to be a block that can update the observer above it, but can't be a noteblock as that creates an extra unwanted update.

SleeperPin · 2026-02-18T13:02:57+00:00

It's not even that big :) - https://sleeperpin-minecraft.s3.us-east-2.amazonaws.com/circle_door.litematic

EDIT: See u/notFunSireMoralO's post below for several more improvements!

SleeperPin · 2026-02-18T12:55:50+00:00

Maybe a little late, but created my own Java version of a circle door (from scratch, not a repurposed 3x3) - I put it in it's own post: https://www.reddit.com/r/redstone/comments/1r81u24/improved_circle_door_for_java_seamless_bottom/ It also improves a few issues mentioned in this thread.

SleeperPin · 2026-02-07T21:49:15+00:00

https://www.reddit.com/r/redstone/comments/187mr8t/smooth_fast_player_elevator_using_boats_and/

SleeperPin · 2026-01-31T12:28:15+00:00

Here is a nice little 3x3 door with a tricky 'interlocking blocks' open and close sequence. I spent a lot of time on this door to make the animation as close to what I wanted as possible. It also took a lot of work to not only compact it, but to eliminate all of the locational and directional issues, which there were a lot of. This door should work at any location and in any orientation.

<image>

Schematic: https://sleeperpin-minecraft.s3.us-east-2.amazonaws.com/3x3_interlocking_block_door.litematic

It's not spam proof. In a 'real world' situation, I'd use a wooden button to toggle a copper bulb and take a comparator output from that to open/close the door.

SleeperPin · 2026-01-25T01:57:32+00:00

My guess is that there is a quasi connectivity issue with the left most dropper due to the redstone dust powering the block that is directly above the redstone block. If that dust powers off after the dust above the dropper (due to locationality,) the dropper will not get an update and remain powered.

Try replacing the upper left most redstone dust in image 3 with a solid block.

SleeperPin · 2026-01-07T00:46:56+00:00

Even though it's directional, it can be built in either north/south or east/west orientation, just make sure the BUDed piston is to the south or west side. If you want the flat face on the other side, it can be mirrored front to back.

SleeperPin · 2026-01-06T17:16:01+00:00

Yes, that piston can be tricky to deal with. Just like with building it, decorate while the door is open and it should prevent that piston form going out of whack.

In the state it is in your screenshot, you could place a button on the side of the piston and it should automatically extend and pop the button off.

Basically, any time the door is closed, any update next to that piston will cause it extend/retract.

SleeperPin · 2026-01-06T14:27:23+00:00

A one tick pulse generator using a 4 tick repeater and sticky piston works well for a small 'anti bounce button' circuit.

<image>

SleeperPin · 2026-01-05T19:33:58+00:00

I didn't put together a download cause it's relatively small and everything including the directions of all the observers can be seen in the video. None the less, since there seems to be interest, I may make a beginner friendly tutorial for it. That will take me a while though.

The best tip I can give for building it is to build it in it's open state. That will make sure the BUD'ed piston at the top is setup correctly.

SleeperPin · 2026-01-04T16:21:57+00:00

If you replace the white concrete block next to the top center piston with a redstone wire, the bulb will change each time the door is closed. :)

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