Redstone · Deep Dark · 1.19+

How to Use a Sculk Sensor

A sculk sensor is a vibration detector. It listens for movement and sound within about 8 blocks and fires a wireless redstone pulse, no dust required. Sneak past it and it never hears you.

~8-block range

wireless redstone out

cooldown after each detection

A sculk sensor hears vibrations within 8 blocks, footsteps, breaking blocks, projectiles, and fires a wireless redstone pulse, then waits out a short cooldown. Sneak to stay silent.

What it hears, and what it ignores

Hears

Footsteps and running

Breaking or placing blocks

Arrows and projectiles landing

Doors, gates and trapdoors

Items dropping nearby

Ignores

Players who are sneaking

Sounds muffled by wool

Anything beyond ~8 blocks

A second hit during cooldown

Quiet it or calibrate it

Pack wool around a sensor to soak up noise you do not want it to hear. To go further, craft a calibrated sculk sensor with three amethyst shards: feed a signal into its side and it only reacts to that one vibration type.

Quick answers

What does a sculk sensor detect?

Vibrations within about 8 blocks: walking and running, breaking or placing blocks, projectiles landing, doors opening, items dropping. It reacts to the event, not to light or line of sight.

How do you stop a sculk sensor triggering?

Sneak to move silently past it, or pack wool around it. Wool absorbs vibrations, so it is the standard way to shield circuits and hide from the Warden in the Deep Dark.

Is a sculk sensor wireless redstone?

Yes. It emits a signal with no dust attached, which you can read directly from a neighbouring block or with a comparator on top. That makes it perfect for hidden, contactless circuits.

What is a calibrated sculk sensor?

A 1.20 variant crafted from a sculk sensor plus three amethyst shards. Feed a redstone signal into its side and it only listens to that one vibration frequency, so it can react to just footsteps, or just block breaks.

How far does a sculk sensor reach?

Roughly 8 blocks in every direction, a sphere around it. The output signal strength encodes how far away the vibration was and what type it was.

Where do you get sculk sensors?

They generate in the Deep Dark biome and Ancient Cities. Mine them with a Silk Touch tool to keep the block; without it the sensor only drops experience.

Database →

Sculk sensor & sculk blocks

Look up the sculk family and Deep Dark blocks.

Guide →

Use an observer

A wired detector for block changes, versus the sculk’s wireless ears.

Reading vibrations without setting them off

It listens to a radius, not a line

A sculk sensor picks up vibrations in a sphere eight blocks across and then goes deaf for a moment while it cools down. That cooldown is what makes it usable as a switch at all: without it a walking player would hold the signal high permanently. Place two sensors close together and they will both fire on the same footstep, which is almost never what you want.

Wool is the only real shield

Wool blocks the vibration outright, so a layer of it between the sensor and the noise is how you aim one. Carpet works the same way and takes no thickness, which matters when you are hiding a sensor under a floor and cannot afford a full block. Nothing else in the game absorbs vibrations, so line of sight has nothing to do with it.

Calibrated sensors pick one sound

Feed a calibrated sculk sensor a redstone signal on its side and it will only answer vibrations of that one frequency. Walking is a different number from a thrown projectile, and a chest opening is different again, so a calibrated sensor is how you build a door that opens for a snowball and ignores every footstep around it.