Vision Light: um instrumento para o auxílio na locomoção de deficientes visuais utilizando a infraestrutura de iluminação

Abstract

About 7,596 million people in Brazil have some type of visual impairment, of which 7.4% are present in the southern region of the country. The work aimed to create a system that helps the individual in locomotion, which is composed of transmitters and receivers based on visible light communication. Checking that the global positioning system (GPS) does not work properly indoors because it operates on radiofrequency, the chosen paradigm was developed especially as which are fixed and distributed along the building infrastructure. Each lamp has its own signature from a different frequency of the sinusoidal current signal, and consequently of light intensity, modulated in a light emitting diode (LED). A receiving device was also developed, which is mobile and must be attached to the body of the visually impaired person. From the sampling of a signal from a photosensor, the developed algorithm estimates the highest luminous power, and with this determine the lamp that is closest and, consequently, its location. A prototype was built and evaluated, demonstrating that it is possible to associate a smartphone application that serves as an interface between the system and a person with visual impairment, informing their location through a synthesized voice. Finally, an analysis of the main results obtained was carried out, which made it possible to conclude the project’s feasibility.