Minecraft:Observer - Revision history

SyncBot: Sync: updated from Minecraft

2026-05-18T11:16:24Z

Sync: updated from Minecraft

← Older revision		Revision as of 11:16, 18 May 2026
Line 35:		Line 35:

	== Usage ==		== Usage ==
	An observer is placed similarly to a [[Minecraft: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 [[Minecraft:redstone pulse]]~~.		An observer is placed similarly to a [[Minecraft: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.

	=== Behavior ===		=== Behavior ===
	{{IN\|java}}, an observer detects [[Minecraft:Block update#Post placement update\|shape updates]] coming from the block it's facing. This can involve changes in block states (like crops growing, for example), or the breaking or placing of a block. This makes observers differ from block update ~~detectors~~ in terms of what they can detect.~~{{only\|JE\|short=1}}~~		{{IN\|java}}, an observer detects [[Minecraft:Block update#Post placement update\|shape updates]] coming from the block it's facing. This can involve changes in block states (like crops growing, for example), or the breaking or placing of a block. This makes observers differ from [[Minecraft:block update detector]]s in terms of what they can detect.

	{{IN\|bedrock}}, an observer acts as a block update detector and detects anything that causes a block update.		{{IN\|bedrock}}, an observer acts as a block update detector and detects anything that causes a block update.
Line 46:		Line 46:
	When it detects something, the observer emits a [[Minecraft:redstone pulse]] of [[Minecraft:Redstone circuit#Power\|strong power]] at signal strength 15 for 2 [[Minecraft:game tick]]s. The pulse can power [[Minecraft:redstone dust]], a [[Minecraft:redstone comparator]], a [[Minecraft:redstone repeater]], or any [[Minecraft:Redstone components#Mechanism components\|mechanism component]] located at its opposite end.		When it detects something, the observer emits a [[Minecraft:redstone pulse]] of [[Minecraft:Redstone circuit#Power\|strong power]] at signal strength 15 for 2 [[Minecraft:game tick]]s. The pulse can power [[Minecraft:redstone dust]], a [[Minecraft:redstone comparator]], a [[Minecraft:redstone repeater]], or any [[Minecraft:Redstone components#Mechanism components\|mechanism component]] located at its opposite end.

	In ''Java Edition'', the pulse is emitted with a delay of 2 game ticks. In ''Bedrock Edition'', it is delayed by 2 game ticks as well, but it's sometimes delayed by 4 or 6 game ticks due to {{bug\|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 {{bug\|MCPE-73342}}.		In ''Java Edition'', the pulse is emitted with a delay of 2 game ticks. In ''Bedrock Edition'', it should be delayed by 2 game ticks as well, but it's sometimes delayed by 4 or 6 game ticks due to {{bug\|MCPE-15793}}.

	Observers also emit a pulse after getting moved by [[Minecraft:pistons]]: this enables them to be used in [[Minecraft:flying machines]]. {{IN\|JE}}, however, moving an observer that is currently emitting a redstone signal ~~will cause~~ it to turn off instead.		Observers also emit a pulse after getting moved by [[Minecraft:pistons]]: this enables them to be used in [[Minecraft:flying machines]]. {{IN\|JE}}, moving an observer while it's not active causes it output a pulse after its usual delay; however, moving an observer that is currently emitting a redstone signal causes it to turn off instead. {{IN\|BE}}, an observer that was moved by a piston always outputs immediately.

	~~Because observers in ''Java Edition'' react to shape updates~~, ~~they can detect some changes~~ that a ~~[[Minecraft:block update detector]] (BUD) would be unresponsive to, as opposed to ''Bedrock Edition'' where observers detect the exact same updates that any other BUD would detect~~.

	[[File:Observer conduction behaviour.png\|alt=An observer preventing the redstone signal from being transmitted.\|thumb\|200px\|Observers preventing the redstone signal from being transmitted in ''Java Edition'']]		[[File:Observer conduction behaviour.png\|alt=An observer preventing the redstone signal from being transmitted.\|thumb\|200px\|Observers preventing the redstone signal from being transmitted in ''Java Edition'']]
	Observers ~~are visually opaque and non-[[Minecraft:conductive]]: they~~ block light and allow mob spawning on top, do not cut off redstone wire, and cannot conduct redstone power. {{IN\|java}}, they also allow opening chests below and prevent redstone wire placed on it from transmitting a signal downward.		Observers block light and allow mob spawning on top, do not cut off redstone wire, and cannot conduct redstone power. {{IN\|java}}, they also allow opening chests below and prevent redstone wire placed on it from transmitting a signal downward.

	=== Limitations ===		=== Limitations ===
Line 205:		Line 203:
	\| {{tc\|Yes}}		\| {{tc\|Yes}}
	\|-		\|-
	\| {{BlockSprite\|snow}} A [[Minecraft:snow]] layer being added into snow by [[Minecraft:player]] or by [[Minecraft:snowfall]].<ref>{{IN\|java}} the [[Minecraft:game rule]] <code>~~snowAccumulationHeight~~</code> must be larger than {{cd\|1}}.</ref>		\| {{BlockSprite\|snow}} A [[Minecraft:snow]] layer being added into snow by [[Minecraft:player]] or by [[Minecraft:snowfall]].<ref>{{IN\|java}} the [[Minecraft:game rule]] <code>max_snow_accumulation_height</code> must be larger than {{cd\|1}}.</ref>
	\| {{tc\|Yes}}		\| {{tc\|Yes}}
	\| {{tc\|Yes}}		\| {{tc\|Yes}}

SyncBot: Sync: updated from Minecraft

2026-05-16T11:19:23Z

Sync: updated from Minecraft

← Older revision		Revision as of 11:19, 16 May 2026
Line 963:		Line 963:
	== Navigation ==		== Navigation ==
	{{Navbox redstone\|components}}		{{Navbox redstone\|components}}
	{{Navbox blocks\|Utility}}		{{Navbox blocks\|Utility}}{{Mojang featured\|https://www.minecraft.net/en-us/article/block-week-observer}}
	[[Category:Mechanisms]]		[[Category:Mechanisms]]
	[[Category:Manufactured blocks]]		[[Category:Manufactured blocks]]

SyncBot: Sync: updated from Minecraft

2026-05-12T11:10:09Z

Sync: updated from Minecraft

← Older revision		Revision as of 11:10, 12 May 2026
Line 963:		Line 963:
	== Navigation ==		== Navigation ==
	{{Navbox redstone\|components}}		{{Navbox redstone\|components}}
	{{Navbox blocks\|Utility~~}}{{Mojang featured\|https://www.minecraft.net/en-us/article/block-week-observer~~}}		{{Navbox blocks\|Utility}}
	[[Category:Mechanisms]]		[[Category:Mechanisms]]
	[[Category:Manufactured blocks]]		[[Category:Manufactured blocks]]

SyncBot: Sync: updated from Minecraft

2026-05-07T11:12:15Z

Sync: updated from Minecraft

← Older revision		Revision as of 11:12, 7 May 2026
Line 909:		Line 909:
	\|{{HistoryLine\|\|1.16.0\|dev=beta 1.15.0.53\|Observers no longer emit a pulse when they are first placed.}}		\|{{HistoryLine\|\|1.16.0\|dev=beta 1.15.0.53\|Observers no longer emit a pulse when they are first placed.}}
	\|{{HistoryLine\|\|1.16.100\|dev=beta 1.16.100.55\|Observers no longer get stuck in an active state when moved by [[Minecraft:piston]]s.}}		\|{{HistoryLine\|\|1.16.100\|dev=beta 1.16.100.55\|Observers no longer get stuck in an active state when moved by [[Minecraft:piston]]s.}}
			\|{{HistoryLine\|bedrock upcoming}}
			\|{{HistoryLine\|\|26.30\|dev=Preview 26.30.27\|Sulfur cubes can now absorb observers, giving them the slow bouncy archetype.}}
	}}		}}

SyncBot: Sync: updated from Minecraft

2026-05-06T11:12:29Z

Sync: updated from Minecraft

← Older revision		Revision as of 11:12, 6 May 2026
Line 891:		Line 891:
	\|{{HistoryLine\|\|\|dev=pre3\|[[File:Observer (back) JE2.gif\|32px]] The back texture of activated observers has been changed.}}		\|{{HistoryLine\|\|\|dev=pre3\|[[File:Observer (back) JE2.gif\|32px]] The back texture of activated observers has been changed.}}
	\|{{HistoryLine\|\|1.17\|dev=21w13a\|Observers now correctly detect when a [[Minecraft:grass block]] changes to [[Minecraft:dirt]] if a tree grows on top.}}		\|{{HistoryLine\|\|1.17\|dev=21w13a\|Observers now correctly detect when a [[Minecraft:grass block]] changes to [[Minecraft:dirt]] if a tree grows on top.}}
			\|{{HistoryLine\|java upcoming}}
			\|{{HistoryLine\|\|26.2\|dev=snap6\|[[Minecraft:Sulfur cube]]s can now absorb observers, giving them the slow bouncy archetype.}}
	}}		}}

SyncBot: Sync: updated from Minecraft

2026-04-29T11:07:29Z

Sync: updated from Minecraft

Show changes

SyncBot: Fix template calls: add MC/ prefix

2026-04-09T20:42:44Z

Fix template calls: add MC/ prefix

Show changes

SyncBot: Remove broken links to missing pages

2026-04-09T15:58:17Z

Remove broken links to missing pages

Show changes

imported>Realshow19: /* Navigation */

2026-02-27T19:20:09Z

Navigation

Show changes

← Older revision		Revision as of 11:16, 18 May 2026
Line 35:		Line 35:

	== Usage ==		== Usage ==
	An observer is placed similarly to a [[Minecraft: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 [[Minecraft:redstone pulse]]~~.		An observer is placed similarly to a [[Minecraft: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.

	=== Behavior ===		=== Behavior ===
	{{IN\|java}}, an observer detects [[Minecraft:Block update#Post placement update\|shape updates]] coming from the block it's facing. This can involve changes in block states (like crops growing, for example), or the breaking or placing of a block. This makes observers differ from block update ~~detectors~~ in terms of what they can detect.~~{{only\|JE\|short=1}}~~		{{IN\|java}}, an observer detects [[Minecraft:Block update#Post placement update\|shape updates]] coming from the block it's facing. This can involve changes in block states (like crops growing, for example), or the breaking or placing of a block. This makes observers differ from [[Minecraft:block update detector]]s in terms of what they can detect.

	{{IN\|bedrock}}, an observer acts as a block update detector and detects anything that causes a block update.		{{IN\|bedrock}}, an observer acts as a block update detector and detects anything that causes a block update.
Line 46:		Line 46:
	When it detects something, the observer emits a [[Minecraft:redstone pulse]] of [[Minecraft:Redstone circuit#Power\|strong power]] at signal strength 15 for 2 [[Minecraft:game tick]]s. The pulse can power [[Minecraft:redstone dust]], a [[Minecraft:redstone comparator]], a [[Minecraft:redstone repeater]], or any [[Minecraft:Redstone components#Mechanism components\|mechanism component]] located at its opposite end.		When it detects something, the observer emits a [[Minecraft:redstone pulse]] of [[Minecraft:Redstone circuit#Power\|strong power]] at signal strength 15 for 2 [[Minecraft:game tick]]s. The pulse can power [[Minecraft:redstone dust]], a [[Minecraft:redstone comparator]], a [[Minecraft:redstone repeater]], or any [[Minecraft:Redstone components#Mechanism components\|mechanism component]] located at its opposite end.

	In ''Java Edition'', the pulse is emitted with a delay of 2 game ticks. In ''Bedrock Edition'', it is delayed by 2 game ticks as well, but it's sometimes delayed by 4 or 6 game ticks due to {{bug\|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 {{bug\|MCPE-73342}}.		In ''Java Edition'', the pulse is emitted with a delay of 2 game ticks. In ''Bedrock Edition'', it should be delayed by 2 game ticks as well, but it's sometimes delayed by 4 or 6 game ticks due to {{bug\|MCPE-15793}}.

	Observers also emit a pulse after getting moved by [[Minecraft:pistons]]: this enables them to be used in [[Minecraft:flying machines]]. {{IN\|JE}}, however, moving an observer that is currently emitting a redstone signal ~~will cause~~ it to turn off instead.		Observers also emit a pulse after getting moved by [[Minecraft:pistons]]: this enables them to be used in [[Minecraft:flying machines]]. {{IN\|JE}}, moving an observer while it's not active causes it output a pulse after its usual delay; however, moving an observer that is currently emitting a redstone signal causes it to turn off instead. {{IN\|BE}}, an observer that was moved by a piston always outputs immediately.

	~~Because observers in ''Java Edition'' react to shape updates~~, ~~they can detect some changes~~ that a ~~[[Minecraft:block update detector]] (BUD) would be unresponsive to, as opposed to ''Bedrock Edition'' where observers detect the exact same updates that any other BUD would detect~~.

	[[File:Observer conduction behaviour.png\|alt=An observer preventing the redstone signal from being transmitted.\|thumb\|200px\|Observers preventing the redstone signal from being transmitted in ''Java Edition'']]		[[File:Observer conduction behaviour.png\|alt=An observer preventing the redstone signal from being transmitted.\|thumb\|200px\|Observers preventing the redstone signal from being transmitted in ''Java Edition'']]
	Observers ~~are visually opaque and non-[[Minecraft:conductive]]: they~~ block light and allow mob spawning on top, do not cut off redstone wire, and cannot conduct redstone power. {{IN\|java}}, they also allow opening chests below and prevent redstone wire placed on it from transmitting a signal downward.		Observers block light and allow mob spawning on top, do not cut off redstone wire, and cannot conduct redstone power. {{IN\|java}}, they also allow opening chests below and prevent redstone wire placed on it from transmitting a signal downward.

	=== Limitations ===		=== Limitations ===
Line 205:		Line 203:
	\| {{tc\|Yes}}		\| {{tc\|Yes}}
	\|-		\|-
	\| {{BlockSprite\|snow}} A [[Minecraft:snow]] layer being added into snow by [[Minecraft:player]] or by [[Minecraft:snowfall]].<ref>{{IN\|java}} the [[Minecraft:game rule]] <code>~~snowAccumulationHeight~~</code> must be larger than {{cd\|1}}.</ref>		\| {{BlockSprite\|snow}} A [[Minecraft:snow]] layer being added into snow by [[Minecraft:player]] or by [[Minecraft:snowfall]].<ref>{{IN\|java}} the [[Minecraft:game rule]] <code>max_snow_accumulation_height</code> must be larger than {{cd\|1}}.</ref>
	\| {{tc\|Yes}}		\| {{tc\|Yes}}
	\| {{tc\|Yes}}		\| {{tc\|Yes}}