CONTINUOUS
Signal Sensor
ON when all 16 cells in its 4×4 area contain material.
15 / 16 → OFF
16 / 16 → ON
Logic / automation assistant
Sandustry Logic Builder
What are you trying to automate?
Build the signal chain you need. Start with the factory behavior—not a wall of gate names.
Example / alternate routes
Pulse Sensor
PULSE
Toggle
MEMORY
↙
Door A
ACTUATOR
↘
NOT
LOGIC
Door B
ACTUATOR
Build a Sandustry logic circuit
Choose the trigger, behavior, memory and confirmed output. The circuit validates itself as you change it.
01
Detect
What should trigger the automation?
02
Process
How should the inputs behave?
03
Remember / Delay
Does the signal need memory or delay?
04
Control
What should the signal control?
Your circuit
Recommended logic
Signal Sensor
CONTINUOUS
Door
ACTUATOR
Ordered signal chain
Available devices
Ordered chain
Signal SensorCONTINUOUS
DoorACTUATOR
Which Sensor should you use?
The area size is the same. The trigger and signal duration are not.
CONTINUOUS
Presence Sensor
ON when at least one material is present in its 4×4 area.
0 present → OFF
1+ present → ON
SHORT PULSE
Pulse Sensor
Sends one short pulse when its 4×4 area changes into the full state.
not full → full → PULSE
full → full → no pulse
| Sensor | Area | Turns ON | Signal |
|---|---|---|---|
| Signal Sensor | 4×4 | All 16 cells contain material | Continuous |
| Presence Sensor | 4×4 | At least one material is present | Continuous |
| Pulse Sensor | 4×4 | Area becomes full | Short pulse |
Need a one-time event? Use Pulse Sensor. Need a state that stays ON? Use Signal or Presence Sensor.
How Sandustry Logic Gates work
Choose a gate, switch its live inputs, and see the current output. XOR and XNOR keep parity behavior beyond two inputs.
BASIC
AND / OR / NOT
AND needs every linked input ON. OR needs at least one. NOT inverts exactly one input.
INVERTED
NAND / NOR
NAND is ON unless every linked input is ON. NOR is ON only when none are ON.
PARITY
XOR / XNOR
XOR is ON for an odd number of ON inputs. XNOR needs at least one linked input and is ON for an even number.
AND live inputs
✓ ValidOUTPUT
OFF
ON when every linked input is ON. Current output: OFF.
AND truth table
| A | B | OUT |
|---|---|---|
| 0 | 0 | 0 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
XOR / XNOR multi-input behavior
XOR is ON for an odd number of ON inputs. XNOR requires at least one linked input and is ON for an even number.
ON OFF OFF → XOR ON
ON ON OFF → XOR OFF
ON ON ON → XOR ON
Toggle, Buffer & Repeater
Use memory for a lasting state, a Repeater for one update of delay, or Buffer for unchanged pass-through.
MEMORY
Toggle
Flips its stored ON/OFF state only when the input goes from OFF to ON.
OFF
↓
ON ← toggle
↓
ON ← no second toggle
↓ OFF ↓
ON ← toggle again
DELAY
Repeater
Stores the current combined input and copies it to output one frame or update later.
input now → output next tick
PASS THROUGH
Signal Buffer
Forwards the combined input unchanged with no added tick delay.
input → same output
Common Sandustry logic setups
These are example automation patterns—not official presets or built-in Blueprints. Load one and keep editing.
Example automation pattern
Full-area shutoff
Storage or bin full
Signal Sensor → Door
Example automation pattern
Presence control
Keep a target active while material exists
Presence Sensor → Door / signal target
Example automation pattern
One-tick delay
Delay a signal by one update
Input → Repeater → Output
Example automation pattern
Toggle memory
Remember state after a pulse
Pulse → Toggle → Output
Example automation pattern
Alternating splitter
Alternate two Door routes
Pulse Sensor → Toggle → Door A / NOT → Door B
Example automation pattern
Fluxite batch reset
Fill, dump, detect end of cycle, reset
Ready A + Ready B → AND → dump; end-of-cycle → reset → fill
Read the Fluxite production guide →How to unlock Sandustry logic
A compact path from the Door to sensors, controls and gates. Ticket costs come from the current 0.5.6b registry.
01
Door
1 Conservatory Ticket
Unlocks
Door
Plan Research →02
Signal Devices
5 Conservatory Tickets
Unlocks
Signal Sensor · Switch · Lamp · Buffer · Signal Linker
Plan Research →03
Signal Controls
5 Conservatory Tickets
Unlocks
Toggle · Button · Pulse Sensor · Presence Sensor
Plan Research →04
Logic Gates
5 Conservatory Tickets
Unlocks
AND · OR · NOT · NAND · NOR · XOR · XNOR · Repeater
Plan Research →Logic not working?
Pick the symptom. The diagnosis starts with current game behavior, not an assumption that the game is bugged.
Check
Check the sensor type
Signal Sensor needs all 16 cells filled. Presence Sensor needs at least one material. Pulse Sensor only fires when the area becomes full.
Likely issue
You may be waiting for a continuous signal from a Pulse Sensor.
How to link signal devices
- 01Select Signal Linker.
- 02Choose the sender.
- 03Choose the receiver.
- 04Repeat the same link to remove it.
Right-click disconnect behavior also exists where supported.
Can this structure be controlled?
✓ Confirmed
Door is a confirmed direct signal actuator.
Common Logic questions
Short answers for the wiring mistakes players hit most often.
Which Sandustry Sensor should I use?
Use Signal Sensor for a continuous full-area state, Presence Sensor for any material, and Pulse Sensor for a one-time event when the area becomes full.
Why does Pulse Sensor only work once?
It only emits when the 4×4 area changes from not full to full. The area must leave the full state before it can trigger again.
How many inputs can NOT use?
Exactly one. With zero or multiple inputs, NOT is invalid and outputs OFF in the current game logic.
How do XOR and XNOR work with more than two inputs?
They use parity. XOR is ON for an odd number of ON inputs. XNOR needs at least one linked input and is ON for an even number of ON inputs.