Automation & transport
Pistons and Observers
Move blocks and detect state changes for automation. This guide summarizes the stable core rules and identifies where edition or version checks are required.
Pistons and Observers- System
- Pistons and Observers
- Category
- Automation & transport
- Coverage
- Core rules and edition notes
Core rules
- Pistons have a block-push limit and immovable-block rules.
- Sticky pistons can pull eligible blocks.
- Observers emit a short pulse when the observed state changes.
Edition and version notes
The core concept exists in the current game, but exact timings, update order, available recipes, commands and edge cases can differ between Java and Bedrock or change between releases. Use the versioned data pages for identifiers and the Java-vs-Bedrock guides for known edition differences.