Hopper

The hopper is a block which moves items into and out of containers. When placed, its output end will attach to the clicked block. If an item falls into the top of it, it will store it in its own internal inventory of five item slots. However, if the hopper's output is attached to (or pointing at) a container with inventory slots (like a chest, another hopper, or a Minecart with Chest), it will transfer items from its inventory to the inventory of the attached block (or cart) at a rate of 2.5 items per second (8 game ticks, 4 redstone ticks or 0.4 seconds per item). The hopper will also transfer items from the inventory of a container placed directly above it into its own inventory at the same rate. Even if the Hopper is drawing items from an inventory above it, and depositing it into another attached inventory, it will still transfer from the source inventory to the destination inventory at 2.5 blocks per second.

Behavior
Hoppers cannot be moved by pistons. Applying a redstone signal will stop the hopper from taking in or pushing out items. Despite not appearing as a solid block, attached blocks such as rails, levers, and redstone dust can be placed on top of hoppers.

When a hopper is connected to an object to its side (for example a chest) and there is a hopper directly underneath it, items in the hopper will be divided evenly between the underlying hopper, and the side output. If there are an odd number of items, the odd one will go into the bottom hopper, as it takes priority. When the bottom hopper is full, all items will be sent to the output on the side, and vice versa.

(Note: to attach hopper to chest, you must be in the sneaking position)

If the first item in the hopper's inventory cannot be placed in the linked container (i.e. a non-fuel item in a hopper that feeds fuel to a Furnace, or a non-stackable item to a full Chest), the hopper will not feed the other items even if they could normally be moved.

Testing with Comparators
If a hopper is the input to a redstone comparator, the comparator will output a redstone signal whenever there are any items stored inside the hopper. A single stored item will output a power level of 1, and the power level will increase by 1 for every additional 22 or 23 stored items (see redstone comparator for precise values), to a maximum power level of 15 at 5 full stacks.

Whether a comparator will activate when a hopper is simply transferring items from its input to its output depends on its configuration. For example, if three hoppers are arranged vertically feeding into each other, so that they are both pulling items from the hopper above and pushing items into the hopper below, a comparator off the middle hopper will activate; but if the middle hopper is faced to the side and powered, so that items are moving through it only because the hoppers above and below are pushing and pulling items into and out of it, a comparator off the middle hopper will not activate.

Interactions
Hoppers can remove items from and place items into the following:
 * Chests (but not Ender Chests)
 * Large chests are treated as a single unit; one hopper placed on a large chest will fill up the whole chest.
 * Hoppers can only remove items from or place items into a chest if it can be opened.


 * Trapped Chests are treated like normal chests.
 * Dispensers
 * Items can be removed from as well as placed in dispensers.
 * if the dispenser is being powered with a comparator (pointing towards it) when the hopper tries to deposit an item, the item will be kicked out of the top of the hopper instead.


 * Furnaces
 * Items fed to the top of a furnace will fill the ore slot, items fed from any side will fill the fuel slot, and hoppers under the furnace will only take finished products.


 * Brewing Stands
 * Similar caveats as with furnaces: hoppers above the brewing stand will fill the ingredient slot, while hoppers to the side will fill the potion slots. Unlike Furnaces, a hopper placed under a brewing stand will empty the brewing stand immediately, whether the potions are complete or not.


 * Minecarts with Chest / Hopper
 * Hoppers will fill minecarts with chests or hoppers if they are pointing at them and are not separated by another block. Hoppers can also take items from minecarts above them; rails can be placed directly on top of hoppers by aiming at a nearby block or holding the sneak key (default ), to make unloading stations. A hopper will not unload a minecart which is on a Detector Rail above the hopper, because the detector rail will power the hopper.


 * Other Hoppers
 * A Hopper fed by another Hopper will take items from the latter even if the former is deactivated by a Redstone signal: to stop the flow of items through two Hoppers both of them must be deactivated.

Connecting

 * A hopper will connect to the block you point at, and only that block (does not automatically connect to others).
 * If you destroy the block the hopper was connected to, it stays pointing to the original location; useful for transferring into minecarts via their sides.
 * To get a hopper to connect to a block with an inventory, sneak and click the block.
 * You can deactivate a hopper with a redstone signal, but note that another (active) hopper can still take items from it.
 * If you place a hopper by clicking on the bottom face of the block, the hopper will not point up, but down instead, because you can't input upwards.

Issues
Bug: If you place a hopper by a chest and destroy the chest it outputs into, any items inserted will be input into the hopper and destroyed.

Trivia

 * A hopper is a type of chute used in industrial processes that incorporates a limited storage capacity.
 * Hoppers do not automatically connect to the nearest storage block. Instead, you must hold the sneak key while placing it on the storage block.
 * The hopper was used in the Dropper recipe until the 13w04a snapshot.
 * If you set fire on top of a hopper, the fire can't be seen, but this is only if there is no block adjacent to the fire.
 * Hoppers pulling items from a furnace will prevent getting experience from the smelting of the items