Observer

From Minecraft Wiki
Observer
First Appearance JE 1.11 (Snapshot 16w39a)
PE: 0.15.0
Type of Block Redstone
Stackable Yes 64
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The Observer was a block exclusive to Minecraft: Pocket Edition, and was added as part of the 0.15.0 update, but it is currently available in Minecraft: Java Edition as of snapshot 16w39a and Minecraft: Bedrock Edition as of the beta 1.2.0.2 update. It is a redstone-compatible block.

Appearance

The observer has a small red dot on the back. The sides are similar to a dispenser, but with a gray "belt" on them. The front is decorated with a stone face.

Mechanics

The observer has two sides: a detector side and an output side. The output side will create a one-Redstone-tick (two in-game ticks, or 0.1 seconds) if the block at the detector side is updated or changed. For a more elaborate demonstration, click here.

Uses

The observer can detect different stages of flowing water (the depth and position), the stages of growing grass or crops, and other observer blocks. Observers can be used to create cool lighting displays, vertical redstone signal transporters and clocks. It does this by detecting the change in the target block's ID or data value. In other words, an observer emits a redstone signal when a nearby block has been updated.

Crafting

Observer
Cobblestone Cobblestone Cobblestone
Redstone Redstone Nether Quartz
Cobblestone Cobblestone Cobblestone