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Antunes, Rui Manuel Carvalho dos Santos de Azevedo
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- An open-source UFBGA m-board for wearable devicesPublication . A. Antunes, R.; Palma, Luís BritoThis paper presents the development of an open-source, low-sized, BGA microcontroller breakout board, that can be used for the development of wearable and cyber-physical prototypes. The board is based on the low power, 8-bit, ATtiny20-CCU Microchip AVR microcontroller. The ATtiny20-CCU can be programmed without bootloader, using the Atmel Tiny Programming Interface (TPI), instead of In-System Programming (ISP). The C code used to program the microcontroller can be written and compiled using the Microchip Studio freeware platform. The ATtiny20-CCU Ultra Fine-pitch Ball Grid Array (UFBGA) packaging technology allows the shrinkage of the conceived Electroless NickelImmersion Gold (ENIG) Printed Circuit Board (PCB) to a size of only 15.5 13 mm. Its low cost also makes it a viable option for developing many educational electronic projects, especially for Instrumentation and Assistive Technology. The contribution of this paper is mainly the hardware prototype design, the PCB manufacturing, building and test of a very low-sized open source m-breakout PCB board, for wearable Instrumentation applications, towards the emergent Society/Industry 5.0.
- Quaternion-based AHRS with MEMS Motion Sensor for Biomedical ApplicationsPublication . A. Antunes, R.; Palma, Luís BritoThis work presents relevant theoretical and practical aspects towards the design of a quaternion-based real-time Attitude and Heading Reference System (AHRS). The motion sensor used in this work is the TDK InvenSense MPU-9250 9-degree (gyro + accelerometer + compass) Microelectromechan ical system. Results show that the AHRS developed device is “gimbal lock” immune, given that the 3D rotations are per formed in quaternions. The tiny electronic device allows real-time transmission of the 3D orientation and can be used as an AHRS solution for medical, sports science, rehabilitation and assistive technology. The contribution of this paper is a theoretical methodology and a practical implementation of an AHRS device for Biomedical applications.
- Fitts’ Evaluation of a Developed Human-in-the-Loop Assistive DevicePublication . Antunes, R. A.; Palma, Luís BritoIn this work, a new human-computer assistive technology gadget designed for people with impairments is evaluated. The developed human-in-the-loop interface device has an embedded assistance controller and can replace the traditional mouse, gamepad and keyboard, enabling humancomputer hands-free full access. This work is concerned with the assistive device performance characterization aspects. Based on the experiments carried out, the human-computer performance improvement with the embedded controller is analysed in detail. Results show that adding the human-in-the-loop assistance controller improves human-computer hands-free skills, which is an innovative contribution for the replacement of computer interfaces that depend on the human hands.