If you’re playing the PC version, you might be wondering what does the observer do in minecraft pc. In Minecraft, the Observer block acts as a redstone component that detects changes in the block directly in front of its “face.”
It’s a fundamental tool for automation. When it sees a change, it sends out a brief redstone pulse from its back. This simple action is the key to countless clever machines.
What Does The Observer Do In Minecraft Pc
At its core, the Observer is a block update detector. It monitors the block state directly in front of its watching face. A “block update” is any change to that block’s properties.
This includes a wide range of events. The Observer is not picky; it reacts to almost any alteration.
Primary Functions And Detection Capabilities
The Observer’s job is to output a redstone signal. It does this when a specific set of events happens. Understanding what it can see is crucial to using it effectively.
It detects changes in the block’s state. This is more than just a block being placed or broken.
What Triggers An Observer
- Block Placement: Putting any block in front of it.
- Block Destruction: Breaking the block in front of it.
- State Changes: Like a door opening or closing, a chest opening, a fence gate toggling, or a piston extending.
- Crop Growth: Each growth stage of wheat, carrots, potatoes, etc.
- Fluid Flow: Water or lava spreading or retracting.
- Fire: A block catching fire or burning out.
- Redstone Changes: A redstone wire turning on or off, or a repeater changing its delay.
What Does Not Trigger An Observer
- Block Movement: If a piston pushes the block in front of the Observer, but the block itself doesn’t change state, it may not trigger. However, the piston moving *does* trigger it.
- Player or Entity Movement: Simply walking in front of it does nothing.
- Light Level Changes: Day/night cycles or torch placement nearby won’t trigger it.
- Changes to Block Entities: While a chest opening triggers it, adding items to the chest does not.
The Observer’s Output Signal
When triggered, the Observer emits a strong redstone signal of strength 15 from its rear output face. This signal lasts for 2 redstone ticks, which is equivalent to 1 game tick (or 0.1 seconds). This short pulse is perfect for triggering other components without needing a pulse shortener.
The output is directional. You must place the Observer with its output face pointing toward the device you want to power. The back has a distinct redstone-like pattern.
Crafting And Obtaining The Observer
You cannot find Observers naturally in the world. You have to craft them. The recipe is straightforward but requires materials from the Nether.
Crafting Recipe Ingredients
To craft one Observer, you will need the following items placed on a crafting table in this exact arrangement:
- Six Cobblestone blocks: Fill the top and bottom rows of the 3×3 grid.
- Two Redstone Dust: Place these in the left and right squares of the center row.
- One Nether Quartz: Place this in the very center square of the grid.
The Nether Quartz is the key ingredient that makes the recipe mid-game. You’ll need to venture to the Nether, mine Quartz ore, and smelt it into Nether Quartz.
Alternative Methods Of Acquisition
While crafting is the primary method, there are a couple other ways to get Observers. In Creative Mode, you can simply take them from the Redstone tab of your inventory. Also, some expert-level Toolsmith villagers might sell Observers for emeralds.
Practical Uses And Farm Designs
The real power of the Observer is revealed when you build farms and machines. It automates tasks that would be tedious to do manually.
Automated Crop Farms
This is one of the most common uses. By detecting crop growth, the Observer can trigger a piston to break the mature crop, collecting it for you.
Building A Simple Pumpkin Or Melon Farm
- Place a dirt block where you want the stem to grow. Plant the pumpkin or melon seeds on it.
- Place an Observer so its face is watching the empty space where the fruit will grow.
- Place a sticky piston adjacent to that space, facing it.
- Connect the output of the Observer to the piston using redstone dust or a repeater.
- When the fruit grows into the observed space, the Observer triggers, the piston extends and breaks the fruit, collecting it. The piston then retracts, ready for the next one.
Automated Tree Farms
Observers can detect when a tree grows from a sapling into a full log. This can be used to instantly break the tree, often using TNT or pistons in complex designs. The Observer watches the sapling block, and when it becomes a log, it triggers the harvesting mechanism.
Item Sorters And Storage Systems
In combination with a hopper and a comparator, Observers can help manage items. For example, you can set up a system where an Observer detects when a composter’s level changes, signaling that it’s ready to produce bone meal, and then triggers a mechanism to collect it.
Hidden Doors And Security
Because Observers detect block updates, they can be used to create seamless hidden entrances. Placing an Observer to watch a specific flower pot or painting means that when a player interacts with that block (a subtle update), it can trigger a piston door to open, revealing a hidden room.
Pulse Generators And Clocks
Two Observers facing each other create a rapid redstone clock. Each Observer detects the other’s output block update, causing them to continuously pulse. This is a very compact clock, though it can be laggy if used in large numbers. You can slow it down by adding delay with repeaters or other blocks between them.
Advanced Redstone Mechanics
For players who want to push the limits, the Observer has unique behaviors that enable complex circuitry.
Quasi-Connectivity And BUD Powering
Before the Observer was added, players used complex “Block Update Detector” (BUD) circuits. The Observer essentially replaced the need for most of these. However, understanding that it is a dedicated BUD block helps you grasp its purpose. It simplifies old, bulky designs into a single block.
Directionality And Placement Tips
The Observer’s face is critical. It has a distinct “watching” face. When placing it, point this face toward the block you want to monitor. The output side has a red dot pattern. Always double-check its orientation before finishing your build; it’s a common mistake to place it backwards.
Using Observers With Moving Blocks
Observers can be moved by pistons. When an Observer is pushed or pulled, it does not emit a pulse from its own movement. However, if its watching face is updated by the movement (like being pushed into a new block), it may then trigger. This allows for very advanced sequential circuits and flying machines.
Flying Machine Engines
This is a pinnacle of Observer use. A basic flying machine uses two Observers and two Sticky Pistons.
- Place a block. Attach a Sticky Piston to one side facing the direction of travel.
- Place an Observer on the sticky piston’s arm, facing backwards toward the main block.
- On the opposite side of the main block, place another Sticky Piston facing the same direction.
- Place a second Observer on this piston’s arm, also facing backward.
- When powered, the Observers alternately trigger each other, causing the pistons to extend and retract, pulling the machine forward one block at a time. Slime blocks are often added to create a platform.
Troubleshooting Common Observer Problems
Even experienced players run into issues. Here are solutions to frequent problems.
Observer Not Emitting A Signal
- Wrong Direction: The most common issue. Ensure the output face (red dots) is pointing toward your redstone dust or device.
- No Actual Update: The event you think should trigger it might not be a block state update. Test with a simple block placement first.
- Blocked Output: Make sure the block space in front of the output face is clear for the redstone signal to travel.
Observer Triggering Too Often Or At Wrong Times
- Unintended Updates: Nearby machinery, like other pistons firing, can cause updates to the block the Observer is watching. Isolate your circuit or move the Observer.
- Rapid Clock: If two Observers are facing each other, you’ve accidentally created a clock. Break the loop.
Pulse Length Issues
The Observer’s 0.1-second pulse is very short. Some devices, like a piston extending to push a block, need a longer pulse. To fix this, place a redstone repeater right after the Observer’s output to extend the pulse duration. Set the repeater to 2, 3, or 4 ticks as needed.
Frequently Asked Questions
How Do You Make An Observer In Minecraft?
You craft it with 6 Cobblestone, 2 Redstone Dust, and 1 Nether Quartz on a crafting table. Place the cobblestone in the top and bottom rows, the redstone on the sides of the middle row, and the quartz in the center.
Can Observers Detect Players?
No, Observers cannot detect players or any other entities directly. They only detect changes to the block state of the single block directly in front of their face. A pressure plate or tripwire is needed for player detection.
What Is The Range Of An Observer Block?
An Observer has a range of exactly one block. It only monitors the block space that its “face” is directly touching. It cannot detect changes any further away than that.
How Do You Use An Observer For A Sugar Cane Farm?
Place an Observer so its face watches the second block of space above the soil where the sugar cane grows. When the sugar cane grows to three blocks tall, the new block in that second space triggers the Observer. Connect the Observer to a piston that will break the second block of sugar cane, causing the top block to break and drop as well.
Can Observers Be Turned Off?
Not directly. An Observer will always output a pulse when it detects an update. However, you can block its signal from reaching other components. Placing a block between its output and your circuit, or using a redstone torch to invert and cancel the signal in a side circuit, can effectively disable its function.