http://hdl.handle.net/20.500.12283/348 2026-04-03T23:23:30Z http://hdl.handle.net/20.500.12283/4666 Modified variable frequency drive that controls two motors at independent speeds and directions in industries Muwanga, Jimmy Lawrence In this project report, the design and implementation of a modified compact frequency drive that controls two motors at independent properties scheme based on sinusoidal pulse width modulation (PWM) technique for a single-phase induction motor. Our main aim is to design, implement and program a circuit drive that controls two motors each with independent commands from the Programmable Logic Circuit (PLC) to alter the speed, direction and starting time for each motor unlike the previous designs which control a single motor with some characteristics. This report is intended to provide a basic understanding about VFD terms, VFD operations, Power Factor improvement, This project was designed using Altium Designer Software and simulated using Proteus software. This variable frequency drive technique to be implemented is mainly focused in industrial applications, lifts so as to provide accurate operation of motors with improved power factor to minimize power usage and maintenance costs. Dissertation 2025-01-01T00:00:00Z http://hdl.handle.net/20.500.12283/4665 A smart rainwater harvesting, control and treatment system for safe water drinking. Eneru, Augustine This project presents the design and implementation of a Smart Rainwater Harvesting, Control, and Treatment System aimed at providing a reliable, safe, and sustainable source of drinking water (smith &Johnsson, 2023). The system is specifically developed to address the water quality and accessibility challenges commonly faced in Ugandan communities, especially in institutions such as schools and health centers. The system integrates a rainwater collection unit, a filtration stage for removing physical debris, and an intelligent boiling treatment mechanism that eliminates microbiological contaminants. A microcontroller (Arduino Uno) acts as the central processing unit, receiving inputs from various sensors including flow switches, temperature sensors, and water level sensors (Garcia & Patel, 2020). It automates water flow through solenoid valves, activates the heater to boil water, and regulates treated water transfer into a clean storage tank. Real-time system status is displayed using an LCD and LED indicators for easy user interaction and monitoring. This approach ensures that collected rainwater is not only harvested efficiently but also made safe for drinking through boiling—a method recognized globally for effective microbial disinfection (World Health Organisation,2019). The system minimizes manual operation, reduces health risks from untreated water, and operates in an energy-conscious and cost-effective manner (Kumar,2023). The proposed system offers the following key benefits: 1. Improved water safety through reliable boiling treatment. 2. Automated water control for enhanced operational efficiency. 3. Minimal chemical usage, reducing environmental impact. 4. Scalability and adaptability for rural homes, schools, health centres, and refugee settlements. 5. Low maintenance and simple operation suitable for low-resource settings (Nguyen et al., 2022). Dissertation 2025-01-01T00:00:00Z http://hdl.handle.net/20.500.12283/4663 Piezoelectricity generations Muhwana, Timothy In this study, a suggestion for producing renewable energy using piezoelectric cells and the PZT is made. transform mechanical energy into electrical energy by causing the material to bend in order to recharge and power portable electronics. This study makes a suggestion for harnessing the mechanical energy that is generated during walking, which is then converted into deformation and the mechanical energy needed to power piezoelectric cells. This mechanical energy is consumed everyday by the entire world's population. The energy generated by a piezoelectric single cell is relatively small. Requires the use of multiple cells in a limited contact area in order to boost the system's output of power. The signal pulse created by the cells is repeatedly converted and stored in capacitors during the piezoelectric rectification and filtering stages that are used to treat the signal. Ends up presenting a shoe-mounted prototype to conduct tests and measurements of the system to determine its ability to generate power from the piezoelectric effect, given that the energy produced by the system is currently not being used for anything, resulting in energy waste. Dissertation 2024-01-01T00:00:00Z http://hdl.handle.net/20.500.12283/4662 Design of a two factor authentication electric power isolation system Nyanja, Charles Vincent Electrical power isolation is an essential safety practice in industrial and commercial settings to prevent unauthorized access and protect maintenance personnel. This project introduces the design of an Electric Power Isolation System with Two-Factor Authentication. An Arduino Nano microcontroller is used to process user inputs from a keypad, which in turn controls an MG99R servo motor to operate the isolator switch. A GSM module is integrated to send SMS alerts for both successful and failed authentication attempts, providing real-time notifications to authorized users. To improve system reliability and user awareness, audio-visual indicators were included—such as a buzzer for incorrect password entries and an LED to indicate system status. The design was initially validated through simulation in Proteus software before being implemented in hardware. The system is particularly suitable for use in industrial switchgear, power distribution units, and maintenance operations where secure control of electrical isolation is vital for safety and efficiency. The resulting system delivered an automated, secure, and effective solution for managing electrical isolation, minimizing the dangers of unauthorized use and unintended power reactivation. Potential future upgrades would include the integration of biometric authentication, IoT connectivity, and remote access capabilities to further enhance security and usability. Dissertation 2025-01-01T00:00:00Z