Navboard: protótipo de um computador embarcado para pessoas cegas ou com baixa visão

Abstract

This work proposes the development of an embedded computer prototype aimed at expanding accessibility for individuals with visual impairments. The system runs software developed in the Python language, featuring a customized and rigorously structured graphical interface to ensure compatibility and fluid interaction with screen reader software. Hardware interaction is facilitated by the inclusion of physical pushbuttons connected to the Raspberry Pi’s GPIO ports: one button dedicated to the program’s immediate startup and another specifically designed for closing tabs and windows, simplifying system control without exclusive reliance on complex keyboard commands. The program offers a range of optimized shortcuts for essential configurations, such as Wi-Fi and Bluetooth connectivity, file explorer access, date and time verification, and web browsing, operating entirely locally to ensure privacy and performance. The results of functional and accessibility validations demonstrated that the prototype fully meets the established requirements, featuring immediate activation of hardware components and compliance with WCAG 2.1 guidelines. Controlled usability tests revealed that the system provides intuitive and autonomous navigation, significantly reducing cognitive overload compared to conventional systems. It is concluded that the integration between the embedded hardware and the assistive interface is technically feasible, consolidating it as an effective digital inclusion tool for people with low vision or total blindness.