🔧 Redstone Logic Lab
Test logic gates, and browse pulse and clock circuits with rough schematics to build in Bedrock.
Gate truth table tester
Building gates in Bedrock
- NOT: single redstone torch inverts the signal.
- AND: run both inputs into one torch — output is on only when both are on.
- OR: bridge two inputs into one line leaving a gap.
- XOR: use two NOT-fed inputs into an AND (needs a couple of blocks).
- NAND / NOR: add a NOT torch after the AND / OR output.
Legend
Schematics follow the wiki convention: gold = solid block, lime = input, pink = output, gray = repeater/comparator/piston, green = slime.
⚡ Pulse circuits
Pulse generators produce timed one-off signals.
Pulse Limiter
Emits a brief 1-tick pulse no matter how long the input stays on.
A block with a redstone torch on top. When the input powers the block, the torch switches off for one tick, producing a short pulse — useful for triggering a single action from a held-down button or lever.
Pulse Extender
Stretches a short pulse into a longer one using repeater delay.
Chain repeaters in a line so the signal travels with added delay. A brief input pulse becomes a longer output pulse — handy for keeping a door or gate open longer.
Rising-Edge Detector
Fires a short pulse only when the input turns ON.
Two torches in a NOT-NOT arrangement produce a brief pulse on the rising edge of the input. An observer facing the input line does the same job in one block.
⏱ Clock circuits
Clocks produce a repeating on/off signal.
Redstone Torch Clock (5-clock)
A repeating clock from three torches; period ≈ 5 redstone ticks.
Three blocks each carrying a torch, connected in a loop. One torch is always off, so the signal cycles on and off continuously.
Repeater Clock
Adjustable clock from two repeaters and dust.
Two repeaters feeding a redstone loop. Changing the repeater delays changes the clock period; tap one repeater to toggle it.
Comparator Clock
Compact clock using a comparator in subtract mode.
A comparator with its output looped back into its side input pulses on and off continuously. Very compact, period set by signal strength.
Hopper Clock
Long-period clock using two hoppers passing an item back and forth.
Two hoppers face each other; a comparator reads one hopper. An item cycles between them, toggling the output slowly — ideal for long timers.
📚 Build guides
Reference notes for sorting, item movement, dispensers, and flying machines.
🗂️ Item Sorting
Automatically sort mixed items into separate chests using a hopper filter.
How the filter works
A filter hopper holds 41 of the item you want to sort in its first slot, plus 1 dummy item (e.g. renamed paper) in each of the other four slots — 45 total. When a matching item drops in, the count rises to 46, the comparator signal steps up, and a redstone torch unlocks the drain hopper below to eject one item into the output chest.
Build order
- Place the filter hopper under your input line (a hopper chain or water stream).
- Fill it with 41 matching items + 4 dummy items.
- Read the filter hopper with a comparator, and wire the output to a torch that locks/unlocks the drain hopper below.
- Non-matching items skip the filter and flow to the next sorter — chain several for a multi-item sorter.
📦 Item Movement
Move items around with hoppers, droppers, water streams, and minecarts.
Hoppers
- Pull items from the container above and push them into whatever they face.
- Point a hopper by placing it against the block you want it to feed.
- Reliable and sortable, but slow — about 2.5 items per second.
Droppers
- Eject items into the world or into another container when powered.
- Stack them vertically to make an item elevator (dropper tower).
Water & ice
- Water streams are fast and free for horizontal transport.
- Put packed ice or blue ice under the water to make items slide much faster.
Minecarts
A hopper minecart running under your farm collects and moves bulk items over long distances.
🎯 Controlling Dispensers & Droppers
Trigger dispensers and droppers with redstone, buttons, and observers.
Dispenser vs dropper
- A dispenser uses the item — it shoots arrows, places water/lava, ignites TNT, equips armor, etc.
- A dropper simply ejects the item as a dropped item.
Powering them
- Any redstone signal (lever, button, pressure plate, or dust) makes them fire once.
- Feed them a repeating clock to fire continuously (e.g. an arrow turret).
Observer automation
An observer watching a crop or block fires the dispenser on every update — useful for auto-bonemealing or auto-sugarcane.
✈️ Flying Machines
Slime/honey + piston engines that push themselves across the world.
How they work
A piston pushes a slime block, dragging the blocks stuck to it; an observer and a second piston then pull the rest, and the cycle repeats to move the whole machine. Slime and honey blocks stick to adjacent blocks, but not to each other — so you can separate moving and stationary parts.
One-directional machine
- An observer facing forward, two sticky pistons, and a slime-block body.
- Power it once and it crawls in a single direction.
Two-directional machine
Mirror the engine on the other end and power only one side to reverse direction.
🛣️ Item Movement Options
A quick comparison of ways to move items.
Redstone (hoppers)
Precise, sortable, and filterable, but slower and iron-hungry. Best for sorting and exact routing.
Water streams
Fast, free, and easy to align, but items can overshoot corners. Best for bulk horizontal transport.
Ice (packed / blue ice)
Items slide far and fast on ice — pair with water or droppers for speed. Blue ice is fastest.
Droppers
The only easy way to move items upward. Stack them into towers.
Minecarts
Best for very long distances or bulk transfer; hopper minecarts can also pick up through blocks.