SPECTUS - IOT-BASED SMART NAVIGATION ASSISTANT FOR THE VISUALLY IMPAIRED

Abstract

The Spectus navigation assistant is an assistive technology device designed to enhance the mobility and safety of visually impaired individuals. By integrating ultrasonic sensing and digital magnetometry, the system provides a comprehensive spatial awareness solution that addresses two primary navigation challenges: obstacle detection and directional orientation. The system utilizes an ESP8266 NodeMCU as the central processing unit, interfacing with an HCSR04 ultrasonic sensor to detect physical barriers within an 80cm range. Unlike traditional canes, this device offers multi-layered feedback through both haptic vibration and high-fidelity audio alerts via the JQ6500 sound module. The vibration intensity is dynamically mapped to the distance of an object, providing a tactile "sense" of proximity. Furthermore, the integration of a GY-271 digital compass allows the device to announce eight cardinal and ordinal directions (North, Northeast, East, Southeast, South, Southwest, West, and Northwest). This ensures that the user is not only aware of immediate hazards but also their overall heading in an environment. The software implementation includes custom calibration and stability algorithms to manage magnetic interference and tilt errors, ensuring reliable performance in real-world conditions. This project represents a cost-effective, scalable, and customizable approach to assistive robotics, leveraging 3D printing and open-source electronics to provide a vital tool for independence.