The library

Every redstone circuit, working

Sixty circuits from a single line of dust to a full adder and a two-by-two piston door. Each one runs in the simulator with the real Java Edition rules, has its truth table or timing measured, and can be dropped into your own build. Start with the learning guide if you are new.

Signal

How a signal travels, weakens, restores and climbs.

Dust lineSee how far one source can carry a usable signal.18 × 1 · 1 layer Repeater restoresSeparate restoring signal strength from delaying a signal.7 × 1 · 1 layer Isolated OR branchesKeep a branch from driving backward into its source.6 × 3 · 1 layer Dust staircaseCarry a signal between heights while checking support and clearance.9 × 1 · 5 layers Vertical torch towerCombine vertical routing with repeated inversion.5 × 1 · 6 layers Independent wire bridgeCross two routes without accidentally joining their signals.9 × 9 · 4 layers Power through a solid blockDistinguish a powered block from a block that passes the needed signal onward.5 × 4 · 1 layer

Logic

Gates and the arithmetic built from them, each with its truth table.

NOT gateInvert one decision.6 × 1 · 1 layer OR gateLet either control enable an output.5 × 3 · 1 layer NOR gateDetect that no input is active.8 × 3 · 1 layer AND gateRequire two conditions at the same time.6 × 3 · 2 layers NAND gateMake the both-active state the only off state.4 × 3 · 2 layers XOR gateDetect a disagreement between two inputs.13 × 17 · 4 layers XNOR gateDetect that two inputs agree.13 × 17 · 4 layers Implication gateDetect whether a logical rule is satisfied.13 × 17 · 4 layers 2-to-1 multiplexerChoose which input is allowed to become the output.17 × 20 · 7 layers 1-to-2 demultiplexerSend one input toward a selected output.13 × 17 · 4 layers 2-to-4 decoderTranslate a binary input pattern into a selected line.25 × 17 · 4 layers Half adderAdd two bits and keep both sum and carry.19 × 17 · 4 layers Full adderAdd two data bits and an incoming carry.57 × 20 · 7 layers Three-input majorityChoose high when at least two of three inputs are high.25 × 20 · 7 layers

Pulse

Turning switches and changes into events of a known length.

Button pulseDistinguish an event from a switch that stays on.4 × 1 · 1 layer Edge detector (observer)Notice changes instead of sustained levels.6 × 1 · 1 layer Pulse extenderKeep an output active longer than its input.8 × 2 · 1 layer Hopper timerStore a finite duration as a quantity of items.3 × 4 · 1 layer Rising-edge detectorProduce an event only when an input becomes active.6 × 3 · 1 layer Falling-edge detectorTrigger an action when an input finishes.6 × 3 · 1 layer Pulse limiter (8 game ticks)Make a short activation from a longer request.6 × 3 · 1 layer Retriggerable comparator extenderExtend a timed activity when another request arrives.8 × 3 · 1 layer

Clock

Circuits that never settle, with their measured periods.

Repeater clockMeasure one complete repeating cycle.5 × 3 · 1 layer Torch clock (3 torches)Explain why an odd ring of inverters cannot hold a consistent value.7 × 5 · 1 layer Comparator clockUse feedback to alternate a comparison result.5 × 3 · 1 layer Two-hopper piston clockCreate a repeating interval from alternating item transfer.8 × 4 · 2 layers Stoppable repeater clockGive an oscillator an explicit run control.5 × 5 · 1 layer

Memory

Latches, flip-flops, counters and registers that remember.

RS latchRemember which of two requests happened last.8 × 3 · 1 layer Locked repeater latchHold a sampled logic level with a lock input.5 × 3 · 1 layer Copper bulb toggleTurn repeated events into alternating remembered states.6 × 1 · 1 layer Four-bit holding registerStore a four-bit word with a shared control.7 × 17 · 1 layer Edge-triggered D flip-flopSample data on a selected clock event.11 × 6 · 1 layer Two-bit ripple counterUse state to count accepted events.11 × 1 · 1 layer Piston T flip-flopUse a mechanical arrangement to store one changing bit.5 × 1 · 1 layer Analog peak memoryRemember the largest signal level seen since clearing.9 × 5 · 1 layer

Detection

Reading containers and players as signals.

Container fullnessTurn inventory contents into a small numeric signal.5 × 1 · 1 layer Comparator thresholdPass a signal only when it meets a reference.10 × 4 · 1 layer Comparator subtractCompute a nonnegative difference between signal strengths.10 × 4 · 1 layer Pressure plateConnect a player action to a control signal.4 × 1 · 1 layer Container empty alarmTurn an empty inventory into an explicit condition.7 × 1 · 1 layer Container full alarmDetect a high inventory boundary.6 × 2 · 1 layer

Transport

Moving items with hoppers and droppers.

Hopper lineFollow items through a directed transport path.4 × 1 · 2 layers Hopper lockUse a control signal to stop an item path.2 × 1 · 2 layers Pulse-driven dropper transferMove one inventory item per accepted activation.4 × 1 · 1 layer Automatic dropper feederRepeat a transfer while inventory still needs service.8 × 5 · 2 layers Three-stage dropper liftCoordinate inventory transfers across height.9 × 5 · 4 layers

Storage

Sorting and overflow.

Item sorterCombine a content filter, a threshold, and controlled transfer.5 × 4 · 5 layers Fullness-controlled overflow storageGive excess items a defined destination.8 × 4 · 4 layers

Pistons

Doors and lifts, including quasi-connectivity.

Sticky piston pusherObserve the control, motion, and final block position separately.4 × 1 · 1 layer Piston door (quasi-connected)Use one control to coordinate a vertical mechanism.3 × 1 · 2 layers Slime group lifterMove an attached group instead of a single block.5 × 2 · 2 layers Slime and honey isolationPlace adjacent moving groups without gluing them together.3 × 4 · 2 layers Two-by-two piston doorwayCoordinate several moving blocks to form one opening.8 × 4 · 2 layers

Not in the library yet

Anything that needs minecarts, water, TNT explosions or sculk: the engine does not simulate moving entities, fluids or explosions, so those are not offered as working previews.