How to use observer in minecraft
Michael Henderson
Updated on March 27, 2026

In Minecraft, the observer watches the block in front of it and sends a redstone pulse when it detects a change. You can use an observer to build traps, farms, flying machines, bridges and so much more! Let’s explore how to use an observer. If playback doesn’t begin shortly, try …
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Tutorial explaining how the observer works and what blocks it can detect. Plus what redstone components it can be used with.SUBSCRIBE to RajCraft:
Minecraft Observer Basics | How to Use Observers! If playback doesn’t begin shortly, try restarting your device. Videos you watch may be …
An observer is placed similarly to a piston. It observes the block that it is placed against. The texture of the detecting side is that of an observing face. As observers can detect the state of other observers, placing two adjacent observers, each watching the other, can make a fast and compact redstone clock.
In order for you to understand how to use an observer, you need to first understand how it works. There are two main parts to the observer: the face and the red signal button on the back.
Usage. An observer is placed similarly to a piston. It observes the block that it is placed against. The texture of the detecting side is that of an observing face. As observers can detect the state of other observers, placing two adjacent observers, each watching the other, can make a fast and compact redstone clock.
Observers are blocks that detect a change in the block state of the space in front of them. This makes them useful for farms and other redstone contraptions. However, when using them with pistons, observers are prone to creating pulse circuits if not placed carefully. However, stabilizers can be used to ‘cut’ the circuit after one pulse, using the locking mechanic of redstone repeaters.
If you absolutely need the piston to only power once, you have to use a more complicated circuit. Each cycle the observer pulses 3 times. Once when a block is placed in front of it, once when the piston extends, and once when the piston retracts. You have to use a pulse divider to divide pulses by 3. This means the circuit will output 1 pulse …
So if you wanted to place an observer looking up, you would have to be below it. A good tip when placing observers is where you aim when you place them, sometimes pointing to a corner or edge of another block will get the observer to place the way you want it …
I want it to face the same way as in the video, which I took a screenshot of and put in the screenshot I took of my game. So if you want the sensor to face the pistons (making the face go the other way), you might have to take down a few pistons. ilmango didn’t have to do that. It’s fine. People have been saying that it doesn’t matter.
Related Questions
How do I place an observer in Minecraft?
First, you need to place an observer. If you don’t have an observer in your inventory, you can quickly make one with a crafting recipe for an observer. The game control to place the observer depends on the version of Minecraft: For Java Edition (PC/Mac), right click on the block. For Pocket Edition (PE), you tap on the block.
What is an observer in Minecraft Bedrock Edition?
In Bedrock Edition, an observer acts as a block update detector and detects anything that causes a block update. The causes and propagation of block updates are different between Java Edition and Bedrock Edition. As a result, each can detect some kinds of changes that the other cannot.
What are observers used for?
Observers act as a block update detector. Observers emit pulses that lasted 1 game tick (0.5 redstone ticks) and have a signal strength of 1. Observers can power blocks (like a redstone repeater ).
What is an observer block?
An observer is a block that emits a redstone signal when the block or fluid it faces experiences a change.