Sensor-Based Prototype of a Smart Assistant for Visually Impaired People—Preliminary Results

Abstract

People with visual impairment are the second largest affected category with limited access to assistive products. A complete, portable, and affordable smart assistant for helping visually impaired people to navigate indoors, outdoors, and interact with the environment is presented in this paper. The prototype of the smart assistant consists of a smart cane and a central unit; communication between user and the assistant is carried out through voice messages, making the system suitable for any user, regardless of their IT skills. The assistant is equipped with GPS, electronic compass, Wi-Fi, ultrasonic sensors, an optical sensor, and an RFID reader, to help the user navigate safely. Navigation functionalities work offline, which is especially important in areas where Internet coverage is weak or missing altogether. Physical condition monitoring, medication, shopping, and weather information, facilitate the interaction between the user and the environment, supporting daily activities. The proposed system uses different components for navigation, provides independent navigation systems for indoors and outdoors, both day and night, regardless of weather conditions. Preliminary tests provide encouraging results, indicating that the prototype has the potential to help visually impaired people to achieve a high level of independence in daily activities.

Development and Application of a High-Precision Portable Digital Compass System for Improving Combined Navigation Performance

“…The digital compass system is three-dimensional, meaning it has three axes. Therefore, in order to convert the three-axis geomagnetic signal from analog to digital, there must be a minimum of three Analog-to-Digital Converter (abbreviation: ADC) channels [ 16 , 17 ]. To fulfill this requirement, the AD7689ACPZ model ADC is selected as the core of this part.…”