A necklace sonar with adjustable scope range for assisting the visually impaired

Area of Science:

• Assistive Technology
• Biomedical Engineering
• Human-Computer Interaction

Background:

• Visually impaired individuals face significant mobility and independence challenges.
• Existing assistive devices may have limitations in providing real-time environmental feedback.
• Need for innovative solutions to enhance spatial awareness and navigation.

Purpose of the Study:

• To develop and evaluate a novel sonar-based device with tactile feedback for the visually impaired.
• To assess the device's efficacy in improving navigation and reducing collisions.
• To provide a customizable and non-intrusive assistive tool.

Main Methods:

• A compact, wearable sonar device was designed using commercially available components.
• The device incorporates a transceiver/receiver, microcontroller, and tactile vibrator for feedback.
• Adjustable detection range and non-auditory tactile feedback were key design features.
• Navigational tasks were conducted in both artificial indoor and live outdoor environments with ten participants.

Main Results:

• The sonar-based device demonstrated significant reduction in head, shoulder, chest, and arm collisions.
• Participants experienced improved mobility and spatial awareness during navigation tasks.
• The tactile feedback system was effective without interfering with auditory senses.
• The device's compact size and light weight (120 grms) contributed to user comfort.

Conclusions:

• The developed sonar-based device with tactile feedback substantially enhances the mobility and safety of visually impaired individuals.
• The technology offers a promising solution for improving independence and quality of life.
• Further research could explore integration with other sensory substitution techniques.