UltraButton: A Minimalist Touchless Multimodal Haptic Button.

Area of Science:

• Human-Computer Interaction
• Haptics
• Ultrasonic Transducer Technology

Background:

• Current mid-air haptic devices are often bulky and expensive, limiting their integration into practical interfaces.
• There is a need for cost-effective and compact solutions for multimodal touchless interaction.

Purpose of the Study:

• To introduce UltraButton, a novel, low-cost ($200) minimalist touchless button with multimodal feedback.
• To demonstrate the feasibility of achieving compelling mid-air haptic and audio feedback using an array of ultrasound transducers.
• To evaluate the performance and user interaction of the proposed touchless button interface.

Main Methods:

• Utilized a novel arrangement of 83 ultrasound transducers and a new modulation algorithm for mid-air haptic and audio generation.
• Validated haptic output against a commercial device using force balance measurements and user perception ratings.
• Integrated RGB LEDs and a proximity sensor to create a multimodal interface and tested user gestures and system parameter dependencies.

Main Results:

• UltraButton achieved comparable haptic output to a commercial mid-air haptic device, with no significant differences in perceived strength.
• The system successfully generated parametric audio and compelling mid-air haptic feedback at a significantly lower cost.
• User gesture experiments provided insights into system parameter optimization for interaction.

Conclusions:

• UltraButton presents a viable, cost-effective solution for multimodal touchless interfaces, overcoming limitations of existing technologies.
• The developed technology enables new interaction paradigms and application scenarios for affordable touchless controls.
• Further research can explore expanded applications and advanced interaction designs based on this platform.