Soft, pliable materials have always posed a barrier for interactive haptics: they’re easy to deform, making it hard to embed sensations such as clicks or resistance without stiffening the object. The University of Bath’s new system, HydroHaptics, turns this on its head by embedding a liquid-filled chamber and compact motor beneath a deformable surface. The result: the object still feels soft to touch, yet can actively produce haptic responses like vibration, resistance, or feedback clicks, tells Tech Xplore.
The system senses user input, such as tap, twist, and pinch, through that same deformable surface. It translates those actions into responses, which are then relayed back physically to the user. Because the actuation happens through a sealed fluid interface, the outer surface never loses its flexibility.
In demonstration prototypes, the team used HydroHaptics in everyday objects: a cushion (to control smart home devices), a soft computer mouse (for digital sculpting), a pliable joystick (for realistic gaming feedback), and even an enhanced backpack (providing tactile notifications or navigation cues via shoulder taps). The cushion, for example, could vibrate or “click” when pressed to change media controls; the backpack could communicate direction by gently squeezing your shoulder.
One of the breakthroughs is achieving high-fidelity feedback through a soft interface—past attempts either compromised softness or produced weak, localized sensations. HydroHaptics maintains scale, richness, and tactile responsiveness without turning the object rigid.
Still, challenges remain. The haptic engine is still somewhat bulky, and designers must balance actuator power with minimal size for real commercial applications. The researchers suggest that with further miniaturization, HydroHaptics could find its way into wearable devices, clothing, soft robotics, gaming devices, and medical simulators.
HydroHaptics hints at a future where our world isn’t just soft or rigid but intelligent and responsive. Your pillow might prompt you, your jacket might whisper a call, and your controller may feel alive.