Redstone circuits are made from a small set of parts. Once you know what each does, most circuits read as combinations you can recognize at a glance. Here is the whole toolkit, grouped by job.
Power sources
These create a signal out of nothing — strength 15 whenever they're active.
- Lever — flips on and stays on until you flip it back. The simplest manual input.
- Button — sends a short pulse, then resets itself.
- Pressure plate — stays on while something is standing on it.
Wiring and shaping
- Redstone dust — carries the signal along the ground, losing
1strength per block. - Redstone torch — inverts its input: on when unpowered, off when powered. The building block of all logic.
- Repeater — passes signal one way only, refreshes it back to
15, and adds an adjustable1–4tick delay. It can also be locked to freeze its output.
Reading and reacting
- Comparator — measures signal strength. In compare mode it passes the rear signal through unless a side input is stronger; in subtract mode it outputs the rear minus the side. It can also read how full a container is.
- Observer — watches the block in front of it and emits a
1-tick pulse whenever that block changes.
Outputs
- Redstone lamp — lights while it's powered.
- Piston — pushes the block in front of it. A sticky piston also pulls the block back when it retracts.