Each item in Minecraft has a unique ID assigned to it, known as an item ID, this can be used in commands to spawn the item into the game. The item ID for observer in Minecraft is shown below:
The Observer item can be spawned in Minecraft with the below command. Cheats must be enabled before this will work.
Block states are values assigned to a block that changes its state. For example, many blocks have a "direction" block state which can be used to change the direction a block faces.
Find a table of all blockstates for the Observer block below.
|Block State Name
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Observer blocks are used in redstone circuits. They fire a redstone signal when an adjoining block is updated.
|Max Stack Size
|Min / Max State IDs
|9260 - 9271