How do logic circuits work in Sandustry?

Logic circuits use Sensors (item, fluid, proximity) to detect game state, then route signals through Logic Gates (AND, OR, NOT) to trigger actions like opening conveyor doors or activating shutoff valves.

What sensors are available in Sandustry?

Three core sensor types: Item Sensors detect specific materials on conveyors, Fluid Sensors detect liquid presence in a block, and Proximity Sensors detect creatures or players within a radius.

How do I build an anti-clog shutoff?

Wire an Item Sensor downstream of your Shaker to a NOT gate connected to the input conveyor. When the sensor detects material buildup (clog), the NOT gate inverts the signal and stops the input belt until the clog clears.

Can I automate factory routing with logic?

Yes. Use fluid sensors to detect water levels, route through OR gates to open overflow drains automatically. Item sensors + AND gates can sort materials onto different belts without manual filter walls.

What is the logic gate limit per circuit?

There is no hard limit, but signal delay accumulates with each gate (~1 tick per gate). For time-critical reactions, keep circuits under 8 gates or use repeaters to refresh signal strength.

Home/Automation Logic

Sandustry Logic Guide: Sensors, Logic Gates & Automation Circuits

CIRCUITS & LOGIC GATES

As your Sandustry factory scales into late-game Void and Fluxite production, dumb gravity chutes and constant belts inevitably suffer from bottlenecks and overflow jams. Logic and Signals allow you to build smart factories with sensors, automated doors, AND gates, and emergency relief shutoffs.

⚡ QUICK LOGIC COMPONENT CHEAT SHEET0 Power Drain · Instant Logic

ITEM & FLUID SENSORSState Detector (0/1)Fires signal when particles/liquid touch sensor

AND / OR / NOT GATESSignal ProcessingNOT gate inverts signal for instant anti-clog shutoff

AUTOMATED DOORSActuators & BrakesDrops or raises physical barriers on conveyor lines

1. SENSORS

Item & Fluid Detectors

Placed along belts or inside fluid tanks. Emits an ON signal (1) when particles or liquids pass through or accumulate above threshold.

2. LOGIC GATES

AND, OR & NOT Inverters

Process incoming sensor signals. An AND Gate only fires when both ingredients are present, preventing unbalanced recipe waste.

3. ACTUATORS

Automated Doors & Belt Brakes

Receive output signals to physically block material flow, throttle conveyor speed, or dump overflow into secondary burn pits.

⚡ 3 Must-Build Factory Logic Blueprints

BLUEPRINT 01 · ANTI-CLOG THROTTLEEssential for Shakers

The Automatic Shaker Anti-Clog Shutoff

Mount an Item Sensor right at the Shaker upper-deck slag exit. Connect it to a NOT Gate wired into the primary sand intake belt. If slag starts backing up, the intake conveyor immediately pauses, completely eliminating the Slag Jam!

BLUEPRINT 02 · FLOOD PROTECTIONEssential for Water Basins

Emergency Fluid Overflow Dump Gate

Place a Fluid Sensor at basin height +4. Wire it directly to an Automated Drain Door leading to an underground drainage cavern. When water surges, the door drops open to prevent diagonal flooding of your machinery.

BLUEPRINT 03 · RATIO BALANCER1:1 Recipe Synchronization

Amethelis + Redsand AND Gate Collision Sequencer

When synthesizing Voidbloom, place sensors on both the Amethelis and Redsand feeder chutes. Connect both into an AND Gate attached to release doors so materials drop in perfect synchrony, ensuring 100% collision efficiency with zero leftover clutter.

💡 Pro Signal Wiring Tips

✓Low Power Cost: Logic signal wires are cheap to run, making them an efficient optimization layer for every factory.
✓Color-Coded Channels: Use Red, Blue, and Green signal wire variants to cross signals across tight spaces without interference.