Sculk Sensor

{
 "title": "Sculk Sensor",
 "rows": [
 {
 "field": "Yes",
 "label": "(link to Renewable resource article, displayed as Renewable)"
 },
 {
 "field": "Yes (64)",
 "label": "Stackable"
 },
 {
 "field": "<span class=\"sprite-file\" style=\"height:32px;width:32px;--vertical-align:middle\">(link to File:SlotSprite Hoe Required.png article, displayed as 32x32px|link=|alt=SlotSprite Hoe Required.png: Sprite image for Hoe Required in Minecraft|class=pixel-image|This block can be broken with any tool, but a hoe is the quickest)</span>",
 "label": "Tool"
 },
 {
 "field": "1.5",
 "label": "(link to Explosion#Blast resistance article, displayed as Blast resistance)"
 },
 {
 "field": "1.5",
 "label": "(link to Breaking#Blocks by hardness article, displayed as Hardness)"
 },
 {
 "field": "Yes (1)",
 "label": "(link to Light article, displayed as Luminous)"
 },
 {
 "field": "Yes",
 "label": "(link to Opacity article, displayed as Transparent)"
 },
 {
 "field": "Yes",
 "label": "(link to Waterlogging article, displayed as Waterloggable)"
 },
 {
 "field": "No",
 "label": "(link to Flammable article, displayed as Flammable)"
 },
 {
 "field": "No",
 "label": "Catches fire<br>from (link to lava article, displayed as lava)"
 },
 {
 "field": "<span style=\"white-space: nowrap;\"><span style=\"display: inline-block; background-color: rgb(76, 127, 153); border: 1px solid #888; border-radius: 0.3em; color: transparent; width: 1em; height: 1em; vertical-align: -0.36em; margin-right: -0.1em\"><br></span> 23 COLOR<wbr/>_CYAN</span>‌<sup class=\" nowrap Inline-Template \" title=\"\">[<i><span title=\"This statement only applies to Java Edition\">(link to Java Edition article, displayed as JE) only</span></i>]</sup><br><span style=\"white-space: nowrap;\"><span style=\"display: inline-block; background-color: rgb(25, 25, 25); border: 1px solid #888; border-radius: 0.3em; color: transparent; width: 1em; height: 1em; vertical-align: -0.36em; margin-right: -0.1em\"><br></span> 29 COLOR<wbr/>_BLACK</span>‌<sup class=\" nowrap Inline-Template \" title=\"\">[<i><span title=\"This statement only applies to Bedrock Edition\">(link to Bedrock Edition article, displayed as BE) only</span></i>]</sup>",
 "label": "(link to Map color article, displayed as Map color)"
 },
 {
 "field": "Default (Harp)",
 "label": "(link to Note Block#Instruments article, displayed as Note block instrument)"
 }
 ],
 "invimages": [
 "Sculk Sensor"
 ],
 "images": [
 "Sculk Sensor.gif",
 "Sculk Sensor BE.gif"
 ]
}

A sculk sensor is a sculk block that detects vibrations caused by nearby actions and events and emits a redstone signal in response. Player-caused vibrations can also trigger nearby sculk shriekers. Sneaking prevents the creation of vibrations while moving, and wool can be used to block or prevent them. Placing an amethyst block next to a sculk sensor allows it to "relay" detected vibrations to other sculk sensors.

A sculk sensor can be mined with any tool, but hoes are the quickest. It drops itself only if mined with any tool enchanted with Silk Touch. If mined with a non-Silk Touch tool, it drops 5 experience instead.

Sculk sensors generate within the deep dark biome and ancient cities.

{ "item": "Sculk Sensor", "stacksize": "1–3", "chance": 0.23725332720231262, "structure": "Ancient City", "container": "Chest" }

A sculk catalyst has a 9% chance of generating a sculk sensor on top of a sculk block.

Sculk sensors can be used to craft calibrated sculk sensors.

A sculk sensor has a light level of 1. When active, it changes to a lighter block state without a change to the light level.

Sculk sensors detect vibrations in an 8 block spherical radius around it. Vibrations are caused by various events, such as players and mobs walking, placing or breaking blocks (except wool or carpet), gliding with elytra, items falling on the ground, shooting projectiles, a piston extending or a wet wolf shaking itself off. Vibrations have an associated frequency; different events create vibrations of different frequencies.

When a vibration is made within the range of a sculk sensor, a signal travels from the vibration source to the sensor at a speed of one block per game tick (20 blocks per second). When the signal arrives, the sensor is activated for 30 game ticks (1.5 seconds). The sensor cannot detect any other vibrations while activated or while a signal is traveling to it.

Sculk sensors have a cooldown period of 10 game ticks (0.5 seconds) after being placed or after deactivating. During this cooldown period, they cannot detect vibrations. This prevents a sensor from reactivating when a contraption it is powering (such as a piston) becomes unpowered.

Sculk sensors don't detect vibrations from other sculk sources or the warden in Java Edition.

Sneaking
While sneaking, a player is not detected while performing most actions corresponding to vibration frequencies 1, 2, or 3, such as moving, hitting the ground without taking damage, interacting with items, and shooting projectiles (although the projectile itself creates a vibration when it hits the ground).

Wool occlusion
Wool and carpets have a special interaction with sculk sensors. If a wool block is placed between a sensor and a vibration source, the sensor is not able to detect the placed wool nor vibrations behind it. Specifically, if the ray joining the cube centers of the sensor block and the vibration source passes through any wool blocks, the vibration is occluded. If the ray passes diagonally through the edge between two blocks, either one or the other block may occlude it but not both. Sculk sensors are not able to detect footsteps or dropped items on wool or carpet, placement or breaking of wool or carpet, or wool or carpets dropping as items.

Sculk shriekers
Sculk sensors pass on the vibrations made by players to sculk shriekers within 8 blocks of the sensor. For example, an item dropped by a player triggers the shrieker, but an item dropped by a dispenser or from a broken block does not; a player flying around with elytra triggers the shrieker, but a bat flying around does not. Alarms can be blocked by wool placed in between the sensor and shrieker, similar to how wool can block vibrations from reaching the sensor itself.

Sculk sensors emit a redstone signal in every direction (including top and bottom) when they are activated. The redstone signal emitted from the bottom powers the block below the sensor strongly, whereas in all other directions it appears as though the sensor itself is the strongly powered block.

The strength of the redstone signal is inversely proportional to the distance the vibration signal traveled – the closer the vibration is to the sculk sensor, the stronger the redstone signal is, so it reaches the maximum redstone signal strength when the vibration is directly on top of the sensor. The distance is measured from the block at which the vibration occurred; moving within a block never results in a different strength.

redstone_strength = max(1, 15 - floor(15 / detection_range * distance))

Each vibration in the game falls under a certain frequency value. This value can be measured with a comparator. With the right contraption utilizing a calibrated sculk sensor or sculk sensor, the player could detect if a certain action has occurred or is occurring nearby.

When a sculk sensor detects a vibration, any adjacent block of amethyst re-emits a vibration of the same frequency that the sculk sensor detected, which can be detected by other sensors and calibrated sculk sensors.

The following occurrences, despite presumably causing physical motion, do not produce vibrations and therefore cannot be detected:

• Blocks destroyed by a fluid flowing into their space^[1]
• Several blocks being destroyed due to their supporting block being removed:^[2]
  • Rails
  • Powered rails
  • Detector rails
  • Activator rails
  • Redstone wire
  • Redstone repeaters
  • Redstone comparators
• Several cases where a dispenser fails to perform an action:^[3]
  • Flint and steel not creating fire
  • Bone meal not growing something
  • Heads and carved pumpkins, if not equipped on something or placed
  • Shulker boxes, if not placed
  • Shears, if there's nothing to shear
  • Glowstone, if it doesn't charge a respawn anchor
• Inserting an eye of ender into an end portal frame^[4]
• Eyes of ender breaking^[5]
• Silverfish entering blocks^[6]
• Water and lava flowing into existing spaces, or drying up^[7]
• Changing the mode of a redstone comparator^[8]
• Changing the delay on a redstone repeater^[9]
• Changing the shape of a single unit of redstone wire^[10]
• Fire extinguished by rain^[11]

The following cases have been confirmed to be intentional:

• Axolotls being bred via tropical fish buckets^[12]
• Moss blocks replacing existing blocks^[13]

Sculk sensors are immovable. Pistons cannot push them, and sticky pistons cannot push or pull them. Slime blocks and honey blocks do not stick to sculk sensors and have no effect whether the slime block or honey block is being pushed or pulled.

A sculk sensor is silent if waterlogged. It can still detect vibration, but does not produce sounds itself.

Java Edition:

Bedrock Edition:

Java Edition:

Bedrock Edition:

Java Edition:

Bedrock Edition:

Java Edition:

Bedrock Edition:

A sculk sensor has a block entity associated with it that holds additional data about the block.

Java Edition:

Bedrock Edition:

See Bedrock Edition level format/Block entity format.

Issues relating to "Sculk Sensor" are maintained on the bug tracker. Issues should be reported and viewed there.

• "Sculk" is derived from "skulk", meaning "keep out of sight, typically with a sinister or cowardly motive".^[21]
• In one of the early "hollowed" concepts of the sculk sensor, it used to require 4 vibrations before it would emit a redstone signal, indicated by the markings on the top texture, which would light up for each vibration received and would slowly go down over time.^[22]

• 👁 Sculk sensor concept art.
  
  Sculk sensor concept art.
• 👁 Trypophobia sculk sensor.
  
  Trypophobia sculk sensor.
• 👁 Trypophobia sculk sensor recreation.
  
  Trypophobia sculk sensor recreation.
• 👁 Ditto.
  
  Ditto.
• 👁 Ditto.
  
  Ditto.
• 👁 Ditto.
  
  Ditto.
• 👁 Ditto.
  
  Ditto.
• 👁 Multiple Sculk sensors with other sculk type of blocks on Minecraft Live.
  
  Multiple Sculk sensors with other sculk type of blocks on Minecraft Live.
• 👁 Ditto. Screenshot by kingbdogz.
  
  Ditto. Screenshot by kingbdogz.
• 👁 Close look.
  
  Close look.
• 👁 Wool occlusion.
  
  Wool occlusion.
• 👁 Sculk sensors as wireless redstone.
  
  Sculk sensors as wireless redstone.
• 👁 Sculk sensors are not affected by rain.
  
  Sculk sensors are not affected by rain.
• 👁 Sculk in a forest.
  
  Sculk in a forest.
• 👁 Old textures.
  
  Old textures.
• 👁 New textures.
  
  New textures.
• 👁 Performance optimizing.
  
  Performance optimizing.
• 👁 Ditto.
  
  Ditto.
• 👁 Snowballs creating vibrations.
  
  Snowballs creating vibrations.
• 👁 Sculk sensors in a cave.
  
  Sculk sensors in a cave.
• 👁 A contraption using a waterlogged sculk sensor.
  
  A contraption using a waterlogged sculk sensor.
• 👁 Sculk type of blocks in redstone category.
  
  Sculk type of blocks in redstone category.

• How to Use Sculk Sensors – Minecraft.net on February 2, 2023