PC/Console/Mobile/tModLoader/tModLoader 1.3-Legacy-Only Content: This information applies only to the PC, Console, Mobile, tModLoader, and tModLoader Legacy versions of Terraria.

Sensors

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Statistics

Type	FurnitureMechanism
Placeable	✔️ (1 wide × 1 high)
Use time	15 (Very fast)
Rarity	01*
Research	5 required

• Internal Item ID: 3613–3615, 3726–3729
• Internal Tile ID: 423

Sensors are Hardmode mechanisms that emit a signal under specific circumstances. There are 7 different types of sensors, split into 2 sub-categories: Logic Sensors and Liquid Sensors.

Types

Sensor		Tooltip
	Logic Sensor (Day) Internal Item ID: 3613	Activates once day starts
	Logic Sensor (Night) Internal Item ID: 3614	Activates once night starts
	Logic Sensor (Player Above) Internal Item ID: 3615	Activates whenever players are over it, deactivates otherwise
	Liquid Sensor (Water) Internal Item ID: 3726	Activates whenever occupied by water, deactivates otherwise
	Liquid Sensor (Lava) Internal Item ID: 3727	Activates whenever occupied by lava, deactivates otherwise
	Liquid Sensor (Honey) Internal Item ID: 3728	Activates whenever occupied by honey, deactivates otherwise
	Liquid Sensor (Any) Internal Item ID: 3729	Activates whenever occupied by liquid, deactivates otherwise

Crafting

Recipes

Result	Ingredients	Crafting station
Liquid Sensor (Any)	Cog5 Magic Water Dropper Magic Lava Dropper Magic Honey Dropper Wire	Mythril Anvil or Orichalcum Anvil
Liquid Sensor (Honey)	Cog5 Magic Honey Dropper Wire
Liquid Sensor (Lava)	Cog5 Magic Lava Dropper Wire
Liquid Sensor (Water)	Cog5 Magic Water Dropper Wire
Logic Sensor (Day)	Soul of Light5 Any Iron Bar Wire
Logic Sensor (Night)	Soul of Night5 Any Iron Bar Wire
Logic Sensor (Player Above)	Soul of Sight Any Iron Bar Wire

Notes

• The Player Above sensor detects players in a 5×10-tile area above the sensor, which is outlined while placing it. In multiplayer, it will not send another signal if a player enters the detection zone while another player is already in it.
  • Due to this, it is a viable and multiplayer-friendly alternative to Pressure Plate powered automatic doors.
  • It will not trigger if placed while the player is inside the detection area. Instead, it will trigger upon leaving the detection zone.
  • Dead players or Hardcore Ghosts will trigger the detector.
• Rain can not trigger Water Sensors.

History

 PC version

• Desktop 1.4.2: Dead players and Hardcore ghosts will no longer trigger Player Above sensors.

• Desktop 1.3.1: Introduced.

 Console version

• Console 1.0.1372.5: Introduced.

 Nintendo Switch version

• Switch 1.0.895.9: Introduced.

 Mobile version

• Mobile 1.4.0.5.0: Introduced.