GuideTouch: An Obstacle Avoidance Device with Tactile Feedback for Visually Impaired

2026-01-20

AI Summary

This study addresses the critical limitation of existing mobility aids in detecting overhead obstacles, which poses significant safety risks for visually impaired individuals. To overcome this challenge, the authors propose a compact, low-cost, and fully wearable standalone system that innovatively integrates vertically aligned time-of-flight (ToF) sensors with a four-point vibrotactile encoding scheme on the shoulders and chest to convey real-time directional and distance information about obstacles. The system further incorporates a centrifugal self-cleaning optical cover and an anti-loss audiovisual alarm to enhance robustness in real-world environments. In user evaluations, 22 participants achieved a 92.9% accuracy rate in recognizing tactile patterns, while 14 visually impaired users demonstrated a 93.75% accuracy in identifying primary directional cues, substantially improving navigation safety and autonomy.

Technology Category

• Intelligent Robots: Multimodal Perception & Sensor Fusion
• Humans and AI: AI for Accessibility
• Computer Vision: Motion & Tracking

Application Category

• Systems and Infrastructure for Web, Mobile and WoT: Energy management for devices in mobile Web and WoT environments
• Security and Privacy: Large-scale security measurements
• Responsible Web: Human-perceived consequences of algorithmic deployment on the web

Abstract

Safe navigation for the visually impaired individuals remains a critical challenge, especially concerning head-level obstacles, which traditional mobility aids often fail to detect. We introduce GuideTouch, a compact, affordable, standalone wearable device designed for autonomous obstacle avoidance. The system integrates two vertically aligned Time-of-Flight (ToF) sensors, enabling three-dimensional environmental perception, and four vibrotactile actuators that provide directional haptic feedback. Proximity and direction information is communicated via an intuitive 4-point vibrotactile feedback system located across the user's shoulders and upper chest. For real-world robustness, the device includes a unique centrifugal self-cleaning optical cover mechanism and a sound alarm system for location if the device is dropped. We evaluated the haptic perception accuracy across 22 participants (17 male and 5 female, aged 21-48, mean 25.7, sd 6.1). Statistical analysis confirmed a significant difference between the perception accuracy of different patterns. The system demonstrated high recognition accuracy, achieving an average of 92.9% for single and double motor (primary directional) patterns. Furthermore, preliminary experiments with 14 visually impaired users validated this interface, showing a recognition accuracy of 93.75% for primary directional cues. The results demonstrate that GuideTouch enables intuitive spatial perception and could significantly improve the safety, confidence, and autonomy of users with visual impairments during independent navigation.

Problem

• obstacle avoidance
• visually impaired
• tactile feedback
• safe navigation
• head-level obstacles

Innovation

• tactile feedback
• ToF sensors
• obstacle avoidance
• wearable device
• visually impaired navigation