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The touch sensor for Lego Mindstorms EV3 robots detects when it is pressed or released.
‘It’s the simpler sensor from the Lego Mindstorms EV3 range and therefore the best sensor to begin with and get used to read sensors and use their values.
But it is also very useful for lots of projects: the touch sensor for Lego Mindstorms EV3 robots can be used as a button to start an action from the robot, can detect when a mobile robot touches an obstacle to avoid it or can tell if the robot has something in its gripper.