Observer

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The Observer was a block exclusive to the Minecraft: Pocket Edition, and was added as part of the 0.15.0 update, but it is now available in the Minecraft Java Edition as of snapshot 16w39a and the 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 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

Blocks
Natural	Air • Stone • Granite • Andesite • Diorite • Bedrock • Clay( Terracotta) • Cobblestone ( Moss) • Cobweb • Dirt • Gravel • Coarse Dirt • Bone • Ice • Monster Spawner • Sand ( Red) • Sandstone ( Red) • Obsidian • Snow • Sponge • Wet Sponge • Stone Brick ( Cracked • Moss • Chiseled) • Prismarine ( Dark • Brick) • Sea Lantern
Manufactured	Bookshelf • Brick • Wool ( Carpet) • Concrete( Powder) • Conduit • Dried Kelp Block • Fence • Glass ( Pane) • Stained Glass ( Pane) • Glazed Terracotta • Hay Bale • Iron Bars • Jack-O-Lantern • Ladder • Painting • Scaffolding • Slabs • Smooth Stone • Cut Sandstone • Smooth Quartz • Smooth Red Sandstone • Slime • Snow • Stairs • Walls • Wooden Planks
Ore	Coal Ore • Diamond Ore • Emerald Ore • Gold Ore • Iron Ore • Lapis Lazuli Ore • Redstone Ore Nether Quartz Ore
Mineral Blocks	Block of Diamond • Block of Emerald • Block of Gold • Block of Iron • Lapis Lazuli Block • Block of Quartz • Block of Redstone • Block of Coal
Utility	Bed • Brewing Stand • Cake • Cauldron • Chest • Shulker Box • Crafting Table • Enchantment Table • Furnace • Jukebox • TNT • Anvil • Blast Furnace • Barrel • Bell • Campfire • Cartography Table • Compost • Fletching Table • Grindstone • Lantern • Lectern • Loom • Smithing Table • Smoker • Stonecutter • Dispenser • Redstone Lamp • Door • Fence Gate • Lever • Note • Piston ( Sticky) • Pressure Plate • Rail ( Powered • Detector • Activator) • Redstone ( Wire • Torch • Repeater • Comparator) • Trapdoor • Trapped Chest • Hopper • Dropper • Daylight Detector • Tripwire Hook • Observer
Plants	Cactus • Dead Bush • Chorus Plant • Flowers • Grass ( Grass • Fern) • Leaves • Lily Pad • Melon • Mushrooms ( Huge)  • Mycelium • Podzol • Pumpkin • Saplings • Sugar Cane • Vines • Wheat • Log • Corals • Kelp • Sweet Berry Bush
Liquids	Lava • Water
Non-Solid	Fire • Sign • Torch • Banner
The Nether	Glowstone • Netherrack • Nether Brick ( Fence)  • Nether Quartz • Nether Wart • Soul Sand • Magma Block
The End	Dragon Egg • End Stone • Purpur • Endstone Brick • End Rod • Dragon Head • Ender Crystal
Creative only	Barrier • Structure Block • Jigsaw
Pocket Edition only	Stonecutter (old) • Nether Reactor
Technical	Piston Arm • Block 36 • Burning Furnace • Glowing Redstone Ore • Off-state Redstone Torch • Active Redstone Repeater • Flowing Water • Flowing Lava • Farmland • Pumpkin Stem • Melon Stem • Block 97 • Portal • End Portal Frame • End Portal
Unused	Locked Chest
Removed	Gear • Dirt Slab • Cyan Flower • Camera(PE)
Unimplemented	Crying Obsidian