Calibrated Sculk Sensor
Craftable 1.20 sculk sensor variant that only detects vibrations on the specific frequency set by a comparator input, enabling precise redstone filtering without noise.
Description
This selective detection makes it a powerful tool for complex redstone circuits. A calibrated sensor watching a door will only fire for door-open events, ignoring footsteps from passing players. Combined with observers, comparators, and clock circuits, it enables event-driven automation: item sorters that fire on specific drop events, security systems that only react to mob arrivals, or music-note triggers that fire on specific block interactions. Calibrated sensors are rarer to obtain than plain sculk sensors but significantly more useful in intricate builds.
Java Edition 1.20
How to Use Calibrated Sculk Sensor
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1
Craft the Calibrated Sculk Sensor
Open a 3x3 crafting grid. Place one Sculk Sensor in the center, then put one Amethyst Shard to the left, one to the right, and one above it. The Calibrated Sculk Sensor cannot be found naturally — crafting is the only way to obtain it.
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2
Place and Identify the Input Side
Place the Calibrated Sculk Sensor on any surface. Look for the solid, non-striped face — that is the input side where you apply the frequency-setting redstone signal. The striped faces are the output side that emits the signal when a vibration matches.
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3
Set the Detection Frequency
Connect a redstone signal of strength 1 to 15 to the input side using a lever, comparator, or any redstone source. Each strength value filters a specific vibration type: 1 = footsteps, 2 = swimming, 3 = wing flap, 4 = projectile launch, 5 = projectile hit, 6 = splash, 7 = item use, 13 = block activation (door, button), 15 = explosion.
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4
Wire the Output to Your Circuit
The output emits a redstone signal when a matching vibration occurs within 16 blocks. Signal strength corresponds to proximity — 15 at the sensor location, decreasing with distance. Connect the output to a comparator, piston, door, or any redstone component.
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5
Dampen Unwanted Vibrations with Wool
Place wool blocks between the sensor and any vibration sources you want to block. Wool absorbs vibrations and prevents the sensor from detecting events in that direction. This lets you create directional filters so only specific pathways trigger the circuit.
Unlike the plain Sculk Sensor, the Calibrated Sculk Sensor is crafted, not mined. Silk Touch is not required. Amethyst Shards are obtained by mining Amethyst Cluster blocks inside Amethyst Geodes found underground between Y=-58 and Y=30.
How to craft this block
Frequently asked questions
What is the Calibrated Sculk Sensor used for?
The Calibrated Sculk Sensor filters vibrations by type, allowing redstone circuits to react to only one specific event — such as opening a door, a projectile landing, or an explosion — while ignoring all other noise. It is the primary tool for event-driven redstone automation in Minecraft Java Edition 1.20+.
What is the difference between a Sculk Sensor and a Calibrated Sculk Sensor?
A regular Sculk Sensor reacts to every vibration within 16 blocks, outputting a signal for any game event. The Calibrated Sculk Sensor adds a redstone input side that sets a frequency (1–15), so it only triggers when the chosen event type occurs. This eliminates false positives from footsteps or ambient noise.
How do you set the detection frequency?
Apply a redstone signal of strength 1 to 15 to the input side (the non-striped face) of the Calibrated Sculk Sensor using a lever, comparator, or any redstone source. Strength 1 = footsteps, 13 = block activation (doors, buttons, levers), 15 = explosion. Changing the input instantly changes the detected event type.
What vibration events correspond to each frequency?
Frequencies map to: 1 = step, 2 = swim, 3 = wing flap, 4 = projectile shoot, 5 = projectile hit, 6 = splash, 7 = item use, 8 = unequip, 9 = equip, 10 = entity dismount, 11 = entity mount, 12 = entity interact, 13 = block change (door, button, lever), 14 = note block, 15 = detonate (explosion, lightning).
How far does the Calibrated Sculk Sensor detect vibrations?
The Calibrated Sculk Sensor detects vibrations within a 16-block radius in all directions. Output signal strength ranges from 1 to 15 depending on distance to the source — closer events produce stronger signals. Wool blocks placed adjacent to the sensor or between the sensor and a source absorb vibrations and block detection from that direction.
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