Redstone Components

How it works

Time units	The game runs 20 game ticks per second. A redstone tick is 2 game ticks (0.1 seconds).
Signal strength	A signal has a strength from 0 (off) to 15. Most power sources give 15. Daylight Detectors, Targets, Sculk Sensors, Trapped Chests, weighted pressure plates and Comparators can give less.
Redstone Dust	Dust takes the strength of its strongest input and loses 1 for every block of dust after that. Dust next to a 15 source is 15, so a line carries the signal 15 blocks; the 16th block of dust gets 0. Dust changes at once, with no delay.
Dust up and down	Dust connects to dust one block higher or lower on a neighboring column. A solid block directly above the dust cuts its connections to dust one block higher.
Strong power	A solid block is strongly powered by a Repeater or Comparator pointing into it, a Redstone Torch under it, an Observer facing away from it, or a Lever, Button, Tripwire Hook or Lightning Rod attached to it. A pressure plate, Detector Rail, Trapped Chest, Lectern or Sculk Sensor on top of it also strongly powers it. A strongly powered block powers everything next to it, including Redstone Dust.
Weak power	A solid block powered only by Redstone Dust (dust on top of it or pointing into it) powers components next to it, such as lamps, pistons and Repeaters, but does not power Redstone Dust.
Redstone Torch burnout	If one Redstone Torch turns off 8 times within 60 game ticks (3 seconds), it burns out and stays off. It checks again after 160 game ticks (8 seconds) and lights only if its block is unpowered and it has turned off fewer than 8 times in the last 3 seconds.
Repeater lock	A Repeater is locked while a powered Repeater or Comparator points into its side. A locked Repeater keeps its current output and ignores its back input.
Comparator, compare mode	Output is the back signal. If a side signal is stronger than the back signal, the output is 0.
Comparator, subtract mode	Output is the back signal minus the strongest side signal, never below 0. Using the Comparator switches modes.
Comparator inputs	The back reads a signal, or the contents of a block that has a reading (see Comparator Outputs). It can read through one solid block to the block behind it, or an Item Frame on that block. Side inputs are Redstone Dust, a Redstone Block, or a Repeater, Comparator or other source pointing into the side.
Light Weighted Pressure Plate	Strength equals the number of entities on it, up to 15.
Heavy Weighted Pressure Plate	Strength is the number of entities divided by 10, rounded up, up to 15. 1 to 10 entities give 1; 141 or more give 15.
Piston push limit	A piston moves at most 12 blocks, counting blocks dragged along by Slime Blocks and Honey Blocks. With more, it does not extend.
Piston speed	The moving blocks travel for 2 game ticks (0.1 seconds) and become normal blocks on the next tick.
Blocks pistons cannot move	Obsidian, Crying Obsidian, Bedrock, Reinforced Deepslate, Respawn Anchor, Lodestone, Anvils, Grindstone, End Portal Frame, an extended piston, any block that stores items or other data (such as Chests, Furnaces, Hoppers, Jukeboxes and Beacons), and unbreakable blocks.
Push but not pull	Glazed Terracotta can be pushed but a Sticky Piston cannot pull it, and it is not dragged by Slime Blocks or Honey Blocks. Fragile blocks such as plants break instead of moving.
Power from above	Pistons, Sticky Pistons, Dispensers and Droppers also react to power reaching the space directly above them. A door reacts to power at either of its two halves.
Rail reach	A Powered Rail or Activator Rail turns on when it is powered or when a powered rail of the same kind is up to 8 rails away along a connected line.
Sculk Sensor strength	Strength is 15 minus the distance to the vibration times 15/8, rounded down, at least 1. For a Calibrated Sculk Sensor the factor is 15/16. A vibration takes 1 game tick per block of distance to arrive.
Calibrated filter	A signal of 1 to 15 into a Calibrated Sculk Sensor's input side makes it react only to vibrations of that frequency. With no input it reacts to every frequency.
Vibration blockers	Wool blocks between the source and the sensor stop a vibration. An Amethyst Block next to an activated sensor repeats the vibration with the same frequency.

Components


Redstone Dust	Strongest input minus 1 per block of dust	None	Any power source or strongly powered block next to it
Redstone Torch	15 to every side except the block it is on; strong power to the block above	1 redstone tick (0.1 seconds)	Turns off while the block it is on is powered
Repeater	15 forward; strong power to the block in front	1 to 4 redstone ticks (0.1 to 0.4 seconds), changed by using it	Power at its back; locked by a powered Repeater or Comparator at its side
Comparator	Back signal, or back minus side in subtract mode	1 redstone tick (0.1 seconds)	Power or a block reading at its back; signals at its sides

Observer	15 out of its back for 1 redstone tick (2 game ticks); strong power to the block behind	1 redstone tick (0.1 seconds)	Any change to the block its face looks at
Lever	15 while on; strong power to the block it is on	None	Using it
Stone Button, Polished Blackstone Button	15 for 20 game ticks (1 second); strong power to the block it is on	None	Pressing it
Wooden buttons (every wood type, Bamboo, Crimson, Warped)	15 for 30 game ticks (1.5 seconds); strong power to the block it is on	None	Pressing it, or an arrow stuck in it (stays on while the arrow is there)

Wooden pressure plates	15; strong power to the block below	None	Any entity, including dropped items and arrows
Stone Pressure Plate, Polished Blackstone Pressure Plate	15; strong power to the block below	None	Players, mobs and Armor Stands only
Light Weighted Pressure Plate	1 per entity, up to 15	None	Any entity
Heavy Weighted Pressure Plate	1 per 10 entities (rounded up), up to 15	None	Any entity

Tripwire Hook	15 while the tripwire is touched; strong power to the block it is on	None	Any entity in the tripwire between two facing hooks, 1 to 40 tripwire apart
Daylight Detector	0 to 15 from sky light, less when the sun is low; inverted: 15 minus sky light	Updates every 20 game ticks (1 second)	Daylight; using it switches to inverted. Does not update in the Nether or the End
Target	1 to 15, higher the nearer the hit is to the center of the face	On for 20 game ticks (1 second) after an arrow, 8 game ticks (0.4 seconds) after other projectiles	A projectile hitting it
Lightning Rod	15 for 8 game ticks (0.4 seconds); strong power to the block it is on	None	Lightning striking it

Sculk Sensor	1 to 15 by distance, range 8 blocks; on for 30 game ticks (1.5 seconds), then 10 game ticks (0.5 seconds) of rest	1 game tick per block the vibration travels	Vibrations
Calibrated Sculk Sensor	1 to 15 by distance, range 16 blocks; on for 10 game ticks (0.5 seconds), then 10 game ticks of rest	1 game tick per block the vibration travels	Vibrations, optionally of one frequency only
Trapped Chest	Number of players and mobs that have it open, up to 15; strong power to the block below	None	Opening it
Lectern	15 for 2 game ticks (0.1 seconds); strong power to the block below	None	Turning a page of the book on it

Jukebox	15 while a disc is playing	None	A playing Music Disc
Detector Rail	15 while a minecart is on it; strong power to the block below	Rechecks every 20 game ticks (1 second)	A minecart on it
Redstone Block	15 to every side, always	None	Always on
Copper Bulb	No signal; its light switches on or off	None	Each time it starts being powered

Crafter	Crafts one item	4 game ticks (0.2 seconds)	Each time it starts being powered
Piston, Sticky Piston	Pushes up to 12 blocks; a Sticky Piston pulls one back	Move takes 2 game ticks (0.1 seconds)	Power at any side except its face, or above it
Dispenser, Dropper	Fires or drops one item	4 game ticks (0.2 seconds)	Each time it starts being powered, including from above
Hopper	Moves 1 item every 8 game ticks (0.4 seconds)	None	Stops moving items while powered

Note Block	Plays its note	None	Each time it starts being powered
Redstone Lamp	Light	On at once; off 4 game ticks (0.2 seconds) after power stops	Power
TNT	Explodes	80 game ticks (4 seconds); 10 to 29 game ticks if lit by another explosion	Power
Bell	Rings	None	Each time it starts being powered

Doors, Trapdoors, Fence Gates	Open while powered, close when power stops	None	Power; Iron Door and Iron Trapdoor open only this way
Powered Rail, Activator Rail	Turns on and passes power up to 8 rails along	None	Power

Buttons and pressure plates


Stone Button, Polished Blackstone Button	20 game ticks (1 second)	Players
Oak, Spruce, Birch, Jungle, Acacia, Cherry, Dark Oak, Pale Oak, Mangrove, Poplar, Bamboo, Crimson and Warped Buttons	30 game ticks (1.5 seconds)	Players and arrows
Stone Pressure Plate, Polished Blackstone Pressure Plate	Until a check finds nothing on it; checks every 20 game ticks (1 second)	Players, mobs and Armor Stands
Oak, Spruce, Birch, Jungle, Acacia, Cherry, Dark Oak, Pale Oak, Mangrove, Poplar, Bamboo, Crimson and Warped Pressure Plates	Until a check finds nothing on it; checks every 20 game ticks (1 second)	Any entity

Light Weighted Pressure Plate	Until a check finds nothing on it; checks every 10 game ticks (0.5 seconds)	Any entity, strength 1 per entity
Heavy Weighted Pressure Plate	Until a check finds nothing on it; checks every 10 game ticks (0.5 seconds)	Any entity, strength 1 per 10 entities

Vibration frequencies


1	Stepping, swimming, flapping wings
2	A projectile landing, landing on the ground, splashing, bouncing
3	Finishing using an item, shooting a projectile, playing an instrument
4	A mob action, gliding with Elytra, taking off equipment

5	Getting off a ride, putting on equipment
6	Interacting with a mob, shearing, getting on a ride
7	A mob or player taking damage
8	Drinking, eating

9	Closing a container or block, a block turning off, detaching
10	Opening a container or block, a block turning on, attaching, lighting TNT, a Note Block playing
11	A block changing state
12	Breaking a block, picking up a fluid

13	Placing a block, placing a fluid
14	Placing an entity, lightning striking, teleporting
15	A mob or player dying, an explosion