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Observer

This article is about the block that detects block updates. For the redstone mechanism, see block update detector.

An observer is a block that emits a quick redstone pulse from its back when the block or fluid directly in front of its "face" experiences a change.

Obtaining

Breaking

An observer requires a pickaxe to be mined. When mined without a pickaxe, it drops nothing.

Block Observer
Hardness 3
Tool
Breaking time[A]
Default 15
Wooden 2.25
Stone 1.15
Iron 0.75
Diamond 0.6
Netherite 0.5
Golden 0.4
  1. ↑ Times are for unenchanted tools as wielded by players with no status effects, measured in seconds. For more information, see Breaking § Speed.

Crafting

Ingredients Crafting recipe
Cobblestone +
Redstone Dust +
Nether Quartz

Usage

An observer is placed similarly to a piston. It observes the block that it is placed against. The texture of the detecting side is that of an observing face. As observers can detect the state of other observers, placing two adjacent observers, each watching the other, can make a fast and compact redstone clock. They send out a pulse.

Behavior

In Java Edition, an observer detects changes in its target's block states, or the breaking or placing of a block (i.e. changes in its block state, but not its block entity data). This means that changes like the age of crops can be detected because they are part of the block states.

In Bedrock Edition, an observer acts as a block update detector and detects anything that causes a block update.

The causes and propagation of block updates are different between Java Edition and Bedrock Edition. As a result, each can detect some kinds of changes that the other cannot. See the table below for a comparison.

When it detects something, the observer emits a redstone pulse of strong power at level 15 for 2 game ticks (1 redstone tick). The pulse can power redstone dust, a redstone comparator, a redstone repeater, or any mechanism component located at its opposite end.

In Java Edition, the pulse is emitted with a delay of 1 redstone tick. In Bedrock Edition, it is supposed to be delayed by 1 tick as well but is actually delayed 2 redstone ticks due to MCPE-15793, a bug causing redstone delays to be incorrect when components are activated by world changes (which, in the case of the observer in Bedrock Edition, is the only way it can be activated), as opposed to pure redstone components ticking. Its timing can also be incorrect due to MCPE-73342.

It also counts as a block update when the observer itself is moved by a piston. When this happens, an observer emits a pulse after being pushed or pulled, but not beforehand. This enables them to be used in flying machines.

Observers behave as both opaque and transparent blocks: they block light and allow mob spawning on top, but do not block opening chests below, do not cut off redstone wire, and cannot conduct redstone power.

Because observers in Java Edition detect changes in the block state, and not block updates, they can detect a wider range of phenomena than a block update detector (BUD) circuit in Bedrock Edition can detect (as some block state changes don't cause block updates). Observers in Bedrock Edition do detect block updates but not block state changes, and so they detect the exact same things that any other BUD would detect in that edition.

Limitations

Change in block state Detected in
Bedrock Edition Java Edition
A block or a fluid being placed or broken in any way; either directly by player, enderman, or ravager or through:
Yes Yes
Water being inserted to or removed from a block that can be waterlogged. Yes Yes
A water (or lava, if lavaSourceConversion is set to true‌[JE only]) source block being created by having 2 water source blocks unite to each other. Yes Yes
Fire being ignited or extinguished in any way; either directly by player or through:
Yes Yes
A fire is turn into a soul fire (but not vice versa). Yes Yes
Fluid or powder snow being placed in or removed from a cauldron or the level of the water/lava/powder snow cauldron changing in any way, for example using bucket (empty, water, lava, powder snow), bottle, water bottle, rain, snowfall, pointed dripstone, burning entity on water/powder snow cauldron. Yes Yes
Block being replace by /setblock, /fill, or /clone commands.[5][6] Yes Yes
Change block state of block using debug stick.‌[Java Edition only] N/A No
A nether portal being created. Yes No[7]
A nether portal being destroyed. No[8] Yes
An end portal being created. No No
An end portal being destroyed. No Yes
The creation of an iron golem, a snow golem, or a wither. Yes Yes
A (sticky) piston (head) extending or retracting. Yes Yes
A block being pushed or pulled by a (sticky) piston; either directly or stuck to slime block or honey block moved by the piston.[9] Yes Yes
A monster spawner block activating. No No
The mob spawn of a monster spawner being changed using a spawn egg. No No
A (trapped) chest turns into a double (trapped) chest and vice versa. N/A Yes
A chest, a trapped chest, or an ender chest opening or closing. No No
A shulker box opening or closing. No Yes
A barrel opening or closing. Yes Yes
The inventory of a block that a comparator can measure as a container changing. No No
The crack stage of an anvil changing after use. Yes Yes
A snow layer being added into snow by player or by snowfall.[10] Yes Yes
A beacon activating or deactivating. Yes No
A command block producing a success. No No
The unconditional/conditional stage of a command block changing. Yes Yes
The impulse/chain/repeat stage of a command block changing. Yes Yes
A piece of a cake or a cake with candles changing. Yes Yes
A hopper being activated or deactivated. (Turning the hopper on/off) Yes Yes
Dry farmland changing between its six dry-looking hydration stages. No Yes
Farmland changing between dry and humid or vice versa. Yes Yes
A dispenser or a dropper activating or deactivating. Yes Yes
A dispenser, dropper, piston or sticky piston changing quasi-connectivity state.[11]‌[Java Edition only] No Yes
A (deepslate) redstone ore block activating or deactivating. Yes Yes
Grass block or mycelium turning to dirt or nylium to netherrack after being spread using bone meal or grass block or mycelium decaying to dirt or nylium into netherrack. Yes Yes
Coarse dirt or rooted dirt converting into dirt through the use of a hoe. Yes Yes
Grass block, dirt, or dirt path converting into farmland through the use of a hoe. Yes Yes
Grass block, podzol, mycelium, dirt, coarse dirt, or rooted dirt converting into dirt path through the use of a shovel. Yes Yes
Farmland or dirt path converting into dirt. Yes Yes
Concrete powder converting into concrete, either through direct contact with water, or entering water as a falling block. Yes Yes
A sea pickle being added into a sea pickle. Yes Yes
A pink petal being added into a pink petal. Yes Yes
A turtle egg being added into a turtle egg. Yes Yes
A turtle egg being removed from a turtle egg by breaking or trampling. Yes Yes
The hatch block state of a turtle egg and a sniffer egg changing. Yes Yes
A stone, cobblestone, deepslate, or any stone brick variant block being turned into an infested block by silverfish. Yes Yes
A double slab being created by adding a slab into another slab. Yes Yes
Ice melting into water or water freezing into ice. Yes Yes
Water freezing into frosted ice through the use of Frost Walker or frosted ice melting into water. Yes Yes
Turn pumpkin into carved pumpkin using shears. Yes Yes
Turn logs/woods/stems/hyphae/block of bamboo into stripped logs/woods/stems/hyphae/block of stripped bamboo using axes. Yes Yes
The stage of a sapling or bamboo changing. Yes Yes
The age of mangrove propagules, bamboo, wheat, carrots, potatoes, beetroots, melon stem, pumpkin stem, nether wart, cocoa, sweet berry bush, chorus flower, cactus, sugar cane, kelp, weeping vines, twisting vines, cave vines, fire, frosted ice, torchflower crop, or pitcher crop changing. Yes Yes
A torchflower crop turning into a torchflower. Yes Yes
Fluid flowing into the empty space to or draining from a block.[12] Yes Yes
Fluid, light block, or composter level changing. Yes Yes
(Flowing) water turning into stone through contact with lava. Yes Yes
Flowing lava turning into cobblestone through contact with water. Yes Yes
Lava turning into obsidian through contact with water. Yes Yes
(Flowing) lava turning into basalt through contact with soul soil and blue ice. Yes Yes
Water turning into bubble column or vice versa. Yes Yes
Upward bubble column turning into whirlpool bubble column or vice versa. Yes Yes
An eye of ender being inserted into an end portal frame. Yes Yes
Player or villager sleeping/waking up in a bed. Yes Yes
A grass block, a mycelium, or a podzol block becoming snowy or not snowy. Yes Yes
Text in a sign or a hanging sign being edited. Yes No
A dye or glow being applied to a sign or a hanging sign or removed from it. Yes No
Waxing a sign or a hanging sign using a honeycomb. Yes No
The mode of a structure block or a comparator changing. Yes Yes
A grass block, grass‌[BE only] or fern‌[BE only] being grazed by a sheep. Yes Yes
A carrot crop being eaten by a rabbit. N/A[13] Yes
A button being pressed or returning to inactive state. Yes Yes
A pressure plate or the detector rail activating or returning to inactive state. Yes Yes
The power of a weighted pressure plate, redstone wire, daylight detector, or target changing. Yes Yes
A lever being flicked. Yes Yes
A redstone lamp or a redstone torch lighting up or turning off. Yes Yes
The mode of daylight detector being changed. Yes Yes
A TNT igniting. Yes Yes
Coral/coral block/coral fan converting into dead coral/coral block/coral fan. Yes[14] Yes
A sponge turning into a wet sponge. Yes Yes
A wet sponge drying into a sponge in the Nether.[15] Yes N/A
A door being opened or closed by a player, a villager, a piglin, a piglin brute, a vindicator‌[JE only], a wandering trader‌[BE only], or redstone. Yes Yes
A trapdoor being opened or closed by a player or redstone. Yes Yes
A fence gate being opened or closed by a player or redstone. Yes Yes
The in_wall block state of a fence gate changing. Yes Yes
A furnace, a blast furnace, or a smoker lighting up or turning off. Yes Yes
The distance of leaves or a scaffolding changing. Yes Yes
The bottom block state of a scaffolding changing. Yes Yes
A potion being moved in or out of a brewing stand. Yes Yes
Book and quill or written book being moved in or out of a lectern. Yes Yes
The note of a note block being changed. No Yes
A note block being left-clicked in Survival mode. No No
The instrument block state of a note block changing. No Yes
A music disc being inserted to or removed from a jukebox by player, hopper, or minecart with hopper. No Yes
A redstone repeater locking or unlocking. Yes Yes
The delay of a redstone repeater being changed. Yes Yes
A redstone repeater, a redstone comparator, an observer, a note block, a lectern, a lightning rod, an activator rail, a powered rail, a sculk sensor[n 1], a calibrated sculk sensor[n 1], a tripwire, or a tripwire hook activating or deactivating. Yes Yes
A tripwire or a tripwire hook attaching or detaching. Yes Yes
The disarmed‌[JE only] or disarmed_bit‌[BE only] block state of a tripwire changing.[16] N/A N/A
Sculk shrieker starting shrieking. No[17] Yes
Sculk shrieker stopping shrieking. Yes Yes
Sculk catalyst blooming or unblooming. Yes Yes
A dragon head or a piglin head activating or deactivating. Yes No
A conduit activating or deactivating. N/A N/A
An item frame being placed or an item being added to, rotated in or removed from an item frame. Yes No
Something being teleported by an end gateway. Yes No
An item being inserted to or removed from a flower pot. Yes Yes
The shape or rotation of walls, fences, iron bars, glass panes, stairs, tripwire, redstone, vines, mushroom blocks, mushroom stem, fire, all type of rails, glow lichen, sculk vein, pointed dripstone, or chorus plant changing. Yes Yes
The top block state of the walls changing. Yes Yes
A melon/pumpkin creates from a melon stem/pumpkin stem. Yes Yes
The stem of a melon or pumpkin attaching or detaching. Yes[18] Yes
Kelp/weeping vines/twisting vines/cave vines turning into a kelp/weeping vines/twisting vines/cave vines plant or vice versa. No Yes
The berries block state of the cave vines (plant) changing. No Yes
A campfire being lit or extinguished. Yes Yes
Food being cooked or popping out of a campfire. Yes No
A hay bale being placed or removed below a campfire. No Yes
Glowstone being added into a respawn anchor. No Yes
A respawn anchor being used. No Yes
A lodestone being used. No No
Oxidation level of unwaxed copper or cut copper block, slab, or stairs changing. Yes Yes
A copper or cut copper block, slab, or stairs being waxed or unwaxed. Yes Yes
Grass/fern/seagrass turning into tall grass/large fern/tall seagrass after bone meal is used on it. Yes Yes
Cactus, sugar cane, bamboo, bamboo shoot, vines, weeping vines, twisting vines, kelp, cave vines, pointed dripstone, or chorus flower growing. No Yes
Chorus flower growing or leaving a chorus plant behind and causing a block update to that. Yes Yes
An amethyst cluster growing. Yes Yes
A bamboo shoot turning into bamboo. Yes Yes
The leaves block state of bamboo changing. Yes Yes
Mushroom spreading. No Yes
1-block-tall flowers spreading after bone meal is used on one.‌[Bedrock Edition only] No N/A
Glow lichen spreading after bone meal is used on one. No Yes
Moss blocks spreading after bone meal is used on one. No Yes
A big dripleaf increasing or decreasing its tilt. Yes Yes
A big dripleaf turning into a big dripleaf stem. Yes Yes
A big dripleaf growing after bone meal is used on it. No Yes
A small dripleaf turning into a big dripleaf after bone meal is used on it. Yes Yes
Hanging roots being created underneath rooted dirt after bone meal is used on it. Yes Yes
A hanging mangrove propagule being created underneath mangrove leaves after bone meal is used on it. No Yes
The number of sea pickle(s) changing after bone meal is used on a coral block. Yes Yes
A sea pickle being created after bone meal is used on a coral block.{{only N/A[19] Yes
Using bone meal on pink petals that do not already have 4 petals. Yes Yes
Vegetation[20] growing on top of or inside grass block, water, moss block, or nylium after bone meal is used on one. N/A Yes
A sapling or a propagule turning into a tree. Yes Yes
A mushroom turning into a huge mushroom after bone meal is used on it. Yes Yes
An azalea turning into a azalea tree after bone meal is used on it. Yes Yes
A fungi turning into a huge fungi after bone meal is used on it. Yes Yes
A grass block turning into dirt when a sapling grows into a tree on that grass block. Yes Yes
A grass block/dirt turning into podzol[21] when a 2×2 spruce sapling grows into a tree on that grass block/dirt. Yes Yes
A grass block/dirt or any other blocks turning into rooted dirt by when an azalea or a flowering azalea grows on that grass block/dirt. Yes Yes
Mud turning into muddy mangrove roots when a mangrove tree grows. Yes Yes
A block that has sculk_replaceable tag turning into sculk by sculk catalyst. Yes Yes
A sculk vein/Sculk veins being created by sculk catalyst. Yes Yes
The shape of sculk vein(s) changing by sculk catalyst. Yes Yes
A sculk sensor or a sculk shrieker being created by sculk catalyst. Yes Yes
A bell ringing. Yes No
A bee leaving a bee nest or a beehive. Yes Unknown
A bee entering a bee nest or a beehive (thus increasing the honey level). No Yes
The honey being collected from a bee nest or a beehive using shears or a glass bottle. Yes Yes
A candle being added into a candle. Yes Yes
A candle being added into a cake. Yes Yes
A candle or candle cake being lit or extinguished. Yes Yes
Dirt/coarse dirt/rooted dirt turning into mud through the use of a water bottle. Yes Yes
Mud turning into clay through the use of pointed dripstone. Yes Yes
A book being add or remove from a chiseled bookshelf by player, hopper, minecart with hopper, or dropper. Yes Yes
A suspicious block becoming less dusted as the player uses a brush, or more dusted if the player stops using a brush. Yes Yes
A suspicious block turning into sand or gravel. Yes Yes
All other block/block state changes. Yes Yes

Note blocks

The observer can be placed under note blocks to produce bass drum sounds.

Sounds

Java Edition:

SoundSubtitlesSourceDescriptionResource locationTranslation keyVolumePitchAttenuation
distance
Block brokenBlocksOnce the block has brokenblock.stone.breaksubtitles.block.generic.break1.00.816
Block placedBlocksWhen the block is placedblock.stone.placesubtitles.block.generic.place1.00.816
Block breakingBlocksWhile the block is in the process of being brokenblock.stone.hitsubtitles.block.generic.hit0.250.516
None[sound 1]Entity-DependentFalling on the block with fall damageblock.stone.fallNone[sound 1]0.50.7516
FootstepsEntity-DependentWalking on the blockblock.stone.stepsubtitles.block.generic.footsteps0.151.016
  1. ↑ a b MC-177082

Bedrock Edition:

SoundSourceDescriptionResource locationVolumePitch
BlocksOnce the block has brokendig.stone1.01.1-1.2
BlocksWhen the block is placeduse.stone1.01.2-1.25
BlocksWhile the block is in the process of being brokenhit.stone0.30.75
PlayersFalling on the block with fall damagefall.stone0.41.0
PlayersWalking on the blockstep.stone0.351.0
PlayersJumping from the blockjump.stone0.121.0
PlayersFalling on the block without fall damageland.stone0.221.0

Data values

ID

Java Edition:

NameIdentifierFormTranslation key
ObserverobserverBlock & Itemblock.minecraft.observer

Bedrock Edition:

NameIdentifierNumeric ID FormItem ID[i 1]Translation key
Observerobserver251Block & Giveable Item[i 2]Identical[i 3]tile.observer.name
  1. ↑ ID of block's direct item form, which is used in savegame files and addons.
  2. ↑ Available with /give command.
  3. ↑ The block's direct item form has the same id as the block.

Block states

See also: Block states

Java Edition:

Name Default value Allowed values Description
facingsouthdown
east
north
south
up
west		The direction the observer is observing. The same direction the player faces when placing the block.
poweredfalsefalse
true		True while the observer is observing a change and emitting a pulse.

Bedrock Edition:

NameMetadata Bits Default value Allowed valuesValues for
Metadata Bits		 Description
facing_direction
(Hidden)		0x1
0x2
0x4		00
1
2
3
4
5		0
1
2
3
4
5		The direction the observer is observing.
  • 0: Observer facing down
  • 1: Observer facing up
  • 2: Observer facing north
  • 3: Observer facing south
  • 4: Observer facing west
  • 5: Observer facing east
minecraft:facing_directionNot Supporteddowndown
east
north
south
up
west		UnsupportedThe direction the observer is observing.
powered_bit0x8falsefalse
true		0
1		True while the observer is observing a change and emitting a pulse.

History

Java Edition
November 24, 2012When announcing the upcoming 1.5 Redstone Update, Jeb mentions that changes to redstone logic may break existing BUD functionality, and therefore that block update detection may need to be implemented into the game in a more permanent, intentional form, rather than as a behavioral quirk.
1.1116w39a Added observers.
Note: the "arrow" texture on the top/bottom of observers is pointing the wrong direction (toward the input, rather than the output).
Observers act as a block update detector.
Observers emit pulses that lasted 1 game tick (0.5 redstone ticks) and have a signal strength of 1.
Observers can power blocks (like a redstone repeater).
Observers have no delay between detecting a block update and emitting a pulse, meaning that observers are essentially instant.
Observers are placed with the observing, or input, side facing the player.
16w41aObservers now emit 4 game tick (2 redstone ticks) pulses.[22]
The signal strength of observers has now been changed to 15.[23][24]
Observers *appear* to no longer strongly power blocks, and now emit only activation power, like a block of redstone (and this may be the intended behavior for this snapshot). However, in reality, they still strongly power blocks, but the blocks adjacent to those blocks aren't given block updates, causing buggy behavior.[25]
Observers are now placed with the output facing the player.[26][27]
A bug where observers would redirect redstone dust from all 4 directions has now been fixed.[28] (They are supposed to redirect dust only from their output side.)
16w42aThe developers have attempted to make observers no longer detect block updates happening to air blocks, in order to make observer behavior more predictable.[29] In the process, they have broken redstone mechanics a bit, so that the block update bug from the previous snapshot now affects redstone repeaters and redstone comparators, too.[30]
16w43a The model of observers has now been changed. The rotation of the "arrow" texture has now been fixed so it points in the correct direction.
General redstone mechanics for observers now work as they did before 16w42a, with the exception of the change named below.
Observers now output strong power like in 16w39a, except that they, as well as redstone repeaters and redstone comparators, no longer provide block updates to transparent blocks or air.
16w44aThe observer block update changes relating to redstone from 16w42a and 16w43a have now been fully reverted.
The behavior of observers has now been overhauled/redefined. Observers have now been changed from a block update detector to a block state change detector.
Observers have now been changed to detect when the block it was observing changed, its basic block state changed, or the block was placed/destroyed. (Note that it does not detect changes in the extended block state, e.g. changes that are not saved when the world is unloaded, such as the shape of a fence, or whether or not a repeater is locked.) This change has now made observer behavior much more predictable, as unexpected/invisible block updates would no longer trigger observers.[31]
Observers have now been changed to emit a 2 game tick (1 redstone tick) pulse when activated.[32]
Observers no longer output power instantly.[33]
pre1 The front and top texture of observers have now been changed.
The redstone output side of observers now blinks red when it outputs power.
1.1317w47aPrior to The Flattening, this block's numeral ID was 218.
Due to The Flattening, observers can now detect all block state changes, e.g. the changes in the shape of fences and redstone dust.
pre4Observers no longer produce a pulse when placed by hand.
1.1418w43a The textures of observers has now been changed.
1.1620w10aObservers can now support ladders and tripwire hooks.[34]
20w14aObservers now correctly detect when the status of the fence changes.
Pre-release 3 The back texture of activated observers has been changed.
1.1721w13aObservers now correctly detect when a grass block changes to dirt if a tree grows on top.
Pocket Edition Alpha
v0.15.0May 2, 2016Jeb tweeted that Daniel Wustenhoff is a working on a BUD block.[35]
Tommaso Checchi tweeted his "rejected graphics" for the observer block.[36]
build 1 Added observer blocks.
v0.15.3Observers are now placed like a piston and not a log.
Bedrock Edition
1.2.0beta 1.2.0.2 The front and top texture of observers have now been changed.
Observer blocks can now detect many more block changes.
The strength of the redstone pulse outputted by observer blocks has now been increased.
Observers no longer pulse twice when observing a retracting piston.
Opening and closing the command block screen no longer activates an observer block.
1.10.0beta 1.10.0.3 The textures of observers has now been changed.
1.16.0beta 1.15.0.53Observers no longer emit a pulse when they are first placed.
1.16.100beta 1.16.100.55Observers no longer get stuck in an active state when moved by pistons.
1.20.10beta 1.20.10.23Now uses the minecraft:facing_direction block state instead of facing_direction.
Legacy Console Edition
TU54CU44 1.52 Patch 241.0.4 Added observers.
1.90 The textures of observers has now been changed.
New Nintendo 3DS Edition
0.1.0 Added observers.

Issues

Issues relating to "Observer" are maintained on the bug tracker. Report issues there.

Trivia

  • The current observer texture was created because Jeb kept confusing the front with the back. He said it was inspired by the "rejected texture" created by Tommaso Checchi.[36][37]

Gallery

  • Development image of an observer from Jeb.
    Development image of an observer from Jeb.
  • The first image released of the new observer texture for Java Edition.
    The first image released of the new observer texture for Java Edition.

See also

References

  1. ↑ For example, a button cling on a block, when break the block that a button are clinging, that button will break and cause block update which can be detect by observer.
  2. ↑ For example, a mushroom are on light level of 13, according to Minecraft Wiki, at level 13 and above, mushroom will uproot unless on mycelium, podzol or nylium. When update the mushroom, that mushroom will break and cause block update which can be detect by observer.
  3. ↑ Another example, a wheat block are on light level of 0, according to Minecraft Wiki, at level 0 and below, wheat block will uproot. When update the wheat, that wheat will break and cause block update which can be detect by observer.
  4. ↑ For example, place 2 chorus plants on top of an end stone. When place a chorus plant on the side of the bottom one, that "bottom" chorus plant will break and cause block update which can be detect by observer.
  5. ↑ If a block get replaced by itself (with the same block states) by the /clone command, the observer will still be able to detect that. This does not happen for /setblock and /fill.[more information needed]
  6. ↑ If observer is placed using /setblock or /fill, that observer will be powered. This don't work for /clone.[more information needed]
  7. ↑ MC-107664
  8. ↑ MCPE-130935
  9. ↑ If an observer being pushed/pulled by a (sticky) piston, that observer will also powered.[more information needed]
  10. ↑ In Java Edition the game rule snowAccumulationHeight must be larger than 1.
  11. ↑ The change of quasi-connected state usually coincides with some other block state change for these mechanisms, such as activating to dispense an item, or the piston head extending/retracting. Therefore, this effect is only noticeable when a dropper or dispenser "deactivates" by losing its quasi-connected status when the redstone power source is turned off. To demonstrate, use a lever to power a redstone repeater that quasi-connects to a dropper. Monitor the dropper with an observer. Turn the lever on. The dropper will drop an item and the observer will trigger. Turn the lever off. The dropper will not do anything, but the observer will trigger again because it detects the dropper's change in quasi-connected state.
  12. ↑ When the fluid source block is removed, all of the fluid flowing from the source will also be removed and cause a block update.
  13. ↑ In Bedrock Edition, rabbits do not eat carrot crops; see MCPE-113321 and MCPE-131980.
  14. ↑ In Bedrock Edition, the death of a coral fan cannot happen under normal circumstances — it happens the very next tick after the coral fan is placed, so the observer will already be reading the placement or water removal update, and coral fans placed using commands are waterlogged — but if lag is used to make the unwaterlogging and death events happen separately, the observer will detect both. For coral, the death also happens too fast for the observer to detect it separate from the placement or water removal, but a non-waterlogged coral can be placed using commands. Coral blocks take multiple seconds to die, and removing water next to the coral block does not activate the observer anyway, so they can be detected under normal circumstances.
  15. ↑ This event cannot normally happen, but if commands are used to place a wet sponge in the nether, the sponge will dry when it recieves a random tick.‌[Bedrock Edition only] In Java Edition, sponges in the Nether always stay wet.
  16. ↑ The disarmed‌[JE only] or disarmed_bit‌[BE only] block state cannot change without also detaching the tripwire, so this event cannot happen in isolation.
  17. ↑ In Bedrock Edition, observers detect when a sculk shrieker stops shrieking, but not when it starts shrieking.
  18. ↑ In Bedrock Edition, placing a pumpkin or melon next to a corresponding stem does not cause the stem to attach.
  19. ↑ In Bedrock Edition, using bone meal on a coral block does not create sea pickles, due to MCPE-171383.
  20. ↑ Grass, tall grass, 1-block-tall flower, seagrass, tall seagrass, coral, (wall) coral fan, moss carpet, azalea, flowering azalea, roots, fungus, nether sprouts, twisting vine, and pink petals.
  21. ↑ Both under the sapling and the area around the sapling.
  22. ↑ MC-107410
  23. ↑ MC-107783
  24. ↑ MCPE-17439
  25. ↑ MC-108696
  26. ↑ MC-107934
  27. ↑ MCPE-17321
  28. ↑ MC-107795
  29. ↑ MC-107730
  30. ↑ MC-108897
  31. ↑ MC-107760
  32. ↑ MC-108697
  33. ↑ MC-107623
  34. ↑ MC-146824
  35. ↑ "Hype train! @darngeek is working on a device that acts as a proper BUD block in MC:PE (PC eventually), currently called "Observer"" – @jeb_ (Jens Bergensten) on X, May 2, 2016
  36. ↑ a b "Here's my rejected graphics for the Observer, because @darngeek has no artistic sensibility" – @_tomcc (Tommaso Checchi) on X, May 2, 2016
  37. ↑ "I kept confusing myself which side was front and back, so here's something inspired by the works of @_tomcc http://i.imgur.com/IK2d8m2.png" – @jeb_ (Jens Bergensten) on X, November 7, 2016
  1. ↑ a b When deactivated, the sculk sensor's and the calibrated sculk sensor's "sculk_sensor_phase" block stage is converted from "active"->"cooldown"->"inactive". However, this happens so fast that observer can't detect it, so that isn't counted.

External Links

Redstone 

View at: Template:Redstone/content [edit]
Blocks
Biota
Wood/Hypha
Plant
Fungus
Algae
Fauna
Fauna/Related
Sculk
Building
Lighting
Ornamental
Mineral Block
Structural
BE & edu only
Utility
Interactable
Utilizable
Redstone/Mechanical
Education Edition only
BE & edu only
Removed
Java Edition only
Bedrock Edition only
MinecraftEdu only
Legacy Console Edition only