https://repositorio.ufu.br/handle/123456789/5145 2026-08-04T18:06:53Z https://repositorio.ufu.br/handle/123456789/49282 Title: Implementação de uma plataforma didática de automação industrial utilizando Raspberry Pi com integração multiprotocolo e monitoramento Abstract: This project aims to implement and validate a didactic industrial automation architecture based on the Raspberry Pi, with emphasis on multiprotocol integration applied to teaching courses such as Industrial Networks I, Industrial Informatics II, and Embedded Systems II. The solution is built around a Raspberry Pi 3 used as the central processing unit, responsible for driving an induction motor through a power interface and acquiring data from industrial sensors, including temperature via 1-Wire, temperature and humidity via I²C, and rotational speed obtained from an incremental encoder. The proposal focuses on a practical demonstration of the Raspberry Pi’s ability to operate simultaneously as a data acquisition node and as a server under different protocols, enabling communication between automation layers and supervisory applications through Modbus TCP, OPC UA, MQTT, and HTTP. Data and commands are made available for monitoring, control, and visualization in environments such as Node-RED and ScadaBR, including the development of dashboards and graphical interfaces to track process variables and actuator status. The expected outcome is a low-cost, secure, and flexible platform capable of supporting laboratory activities by integrating, within a single system, data acquisition, control, and multiprotocol communication. In this way, the work contributes to the practical training of students in automation and connectivity technologies associated with Industry 4.0, providing a replicable environment for demonstrations, testing, and validation of modern industrial architectures. 2026-03-17T00:00:00Z https://repositorio.ufu.br/handle/123456789/49254 Title: antena de microfita de dupla polarização de alto ganho e banda larga baseada em perturbação modal e ressonadores de 𝜆/4 Abstract: This work presents the design, analysis, and experimental validation of a dual-polarized square microstrip patch antenna with enhanced bandwidth and realized gain. The proposed antenna operates under modified TM10 and TM01 modes, which are independently excited through two orthogonal feed ports. The gain enhancement is achieved by incorporating four metallic vias symmetrically positioned between the radiator and the ground plane; this configuration perturbs the electromagnetic field distribution within the substrate, making the antenna electrically larger relative to the resonant wavelength. Simultaneously, bandwidth enhancement is attained through a feeding system composed of pairs of quarter-wavelength (𝜆𝑔/4) microstrip line resonators. These resonators introduce an additional resonance associated with the feed network, functioning as an integrated filter that, when properly coupled to the modified fundamental mode of the patch, results in a significant expansion of the impedance bandwidth. Unlike conventional approaches, this work integrates both techniques into a single dual-polarization architecture while maintaining the structure’s compactness and low profile. The design process was optimized using the Finite Element Method (FEM), followed by the fabrication and characterization of a prototype on a Rogers CuClad 250GX substrate. Experimental results demonstrated excellent agreement with computational predictions. The final device achieves a fractional bandwidth of approximately 7.5% (6.93–7.47 GHz) for |𝑆𝑛𝑛| ≤ −10 dB. At the 7.25 GHz operating frequency, the antenna exhibits a peak realized gain of 10.3 dBi, port-to-port isolation greater than 25.0 dB, and cross-polarization discrimination of 22.2 dB. Additionally, time-domain analyses confirm that the dispersive parameters and group delay of the structure do not impose significant limitations on digital communication system performance. 2026-07-29T00:00:00Z https://repositorio.ufu.br/handle/123456789/49231 Title: Desenvolvimento de protótipo para diminuição do risco de morte súbita infantil Abstract: This work presents the development of a functional prototype of a wearable system for neonatal physiological monitoring in a home environment, focusing on the demonstration of real-time data acquisition and transmission. The proposed solution is based on photoplethysmography (PPG) to estimate peripheral oxygen saturation (SpO₂) and heart rate (BPM). The hardware is composed of the ESP32 microcontroller and the MAX30102 optical sensor, incorporating basic safety mechanisms such as battery thermal monitoring and a hardware lock that prevents operation during the charging process. The firmware implements signal acquisition and processing routines, including strategies to reduce interference, such as detection of lack of contact and possible motion artifacts. The collected data are transmitted via Bluetooth Low Energy (BLE) to the mobile application "OxiNeonatal", which enables real-time visualization, data storage, and alert management. The tests performed were preliminary in nature, limited to functional validation of the system under controlled conditions, without clinical trials or regulatory certification. The results demonstrate the technical feasibility of the proposed architecture and the integration between hardware, firmware, and software, indicating potential for future applications, subject to further validation, regulatory compliance, and device improvement. 2026-03-17T00:00:00Z https://repositorio.ufu.br/handle/123456789/49199 Title: Modelagem de enlaces de comunicação com nanossatélites Abstract: This work presents an analysis of the communication link performance between low Earth orbit (LEO) nanosatellites and a ground station located at the Santa Mônica campus of the Federal University of Uberlândia. Given the increasing use of CubeSats for a wide range of applications, understanding how link losses behave is essential to ensure the reliability of the communication system. The study investigates the main factors that influence link performance, including the satellite antenna gain, atmospheric conditions, data rate, and elevation angle. The methodology relied on classical link budget modeling and MATLAB-based simulations, which made it possible to observe how each parameter affects the signal-to-noise ratio and the overall link margin. The results indicate that the combination of intense rainfall, low elevation angles, and high data rates forms the most critical scenario for communication, potentially making the link unfeasible when the margin is insufficient. The findings highlight that selecting appropriate CubeSat parameters, together with understanding the local environmental conditions, is crucial for the efficient design of nanosatellite communication systems. 2026-02-12T00:00:00Z