CASAband wristband uses shape memory alloys for silent haptic feedback
A 63g textile wristband delivers precise directional cues with over 90% accuracy...
Haptic interfaces for the wrist and forearm offer hands-free interaction but face a tradeoff between functionality, wearability, and untethered operation. CASAband (Compliant Amplified Shape memory Alloy band) addresses this by integrating four CASA actuators into a layered textile band. The device weighs only 63 grams, produces no noise, and achieves a blocked force of up to 1.7N with 3.2mm free displacement across a bandwidth of 1.34–6.59 Hz depending on voltage input.
In perceptual studies, users identified the location of a single haptic cue around their wrist and discriminated among several patterned cues with over 90% average accuracy. Two real-world demonstrations validated its utility: a pick-and-place task relying only on haptic communication from a moderator, and an outdoor pedestrian navigation task using only directional wrist cues. CASAband is among the first haptic interfaces to balance form and function, opening new opportunities for silent, untethered haptic feedback in guidance and navigation.
- 63g untethered textile wristband with four shape memory alloy actuators generating 1.7N force and 3.2mm displacement
- Operating bandwidth from 1.34 to 6.59 Hz with zero noise emission
- Users achieved over 90% average accuracy in identifying single locations and patterned haptic cues
Why It Matters
Enables silent, untethered haptic navigation and guidance without obstructing hands or natural motion.