"Apply to an object. Senses when the player interacts with it using touch." - LittleBigPlanet PS Vita
The Touch Sensor is a sensor gadget introduced in LittleBigPlanet PS Vita that allows players to directly interact with objects by means of the touchscreen or touchpad. To use it open popit and select the tools bag, use L or R to get to the Gadgets page and select it from the sensors section. Pressing square while hovering the popit cursor over the touch sensor opens up the tweeker menu that lets you change the touch types, range, trigger output and visuals. The Touch Sensor can be added to Microchips
You can learn how to use the touch sensor by viewing the tutorial available in the game.