Department of Physical Sciences

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https://repository.run.edu.ng/handle/123456789/74

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    Radioclimatic Variable Characterization and Statistical Validation for Tropical Microwave Link Applications
    (Journal of Engineering Science and Technology Review, 2024-06-24) Modupe E. Sanyaolu, Oluwafunmilayo O. Ometan, Felix O. Popoola, Sheu I. Owoyem, Ayodele O. Soge and Alexander A. Willoughby
    The main factor impairing radio wave propagation is atmospheric refraction. To account for fade margin, a crucial component of a reliable radio link, accurate estimates of the refractivity gradient and geoclimatic factor are vital for radiowave signal transmission. In this study, three years of data from 2019 to 2021, collected from six distinct locations in Nigeria were utilized to analyse the radioclimatic variables to determine their influences on microwave linkages. The obtained values for surface refractivity show seasonal variation, with higher values during the wet season and lower values during harmattan. Makurdi, located in the north of the country, is mostly impacted by sub-refraction, whilst Lagos and Port-Harcourt, in the south, are impacted by super-refraction. The findings demonstrate that the shift of the intertropical discontinuity had an impact on how the seasons varied across the studied locations. The result would be an excellent tool for designing microwave wireless links in Nigeria.
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    Design and Construction of a Photovoltaic Monitoring System Based on Wireless Sensor Networks and Internet of Things Technology
    (Springer, 2024-05) Soge, Ayodele O.
    Poor monitoring of a photovoltaic (PV) system is responsible for undetected faults that reduce the energy produced by the system and in the long run decrease its lifespan. However, this challenge can be overcome by real-time monitoring of the electrical and environmental parameters of the PV system. Several wireless real-time monitoring systems are available, but none have a backup storage device and could only monitor a few parameters at a relatively high cost. Besides, these systems cannot monitor the battery storage and the inverter output, thus failing to meet the IEC-61724 standard. In this paper, we report a robust monitoring system developed for both local and remote real-time monitoring of a PV system. The electrical and environmental parameters of the PV system were monitored and saved using wireless sensor networks and Internet of Things (IoT) technology. This was achieved using two Atmega 328P microcontrollers, which formed the data acquisition units, and an ESP32 microcontroller for the master terminal unit. The data acquisition unit consists of two nodes: the PV node, and the battery node. All data are received by the master terminal unit and sent to the ThingSpeak online server using the IoT capability of the ESP32 microcontroller. The developed system was installed in a 12 V, 200 W standalone PV system and all desired parameters were successfully monitored, logged, and transmitted to the cloud in real time for easy accessibility by the users via the internet.
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    An IoT-Based Home Automation and Weather Monitoring System
    (International Journal of Research and Innovation in Applied Science (IJRIAS), 2022-03) Ilori Oluwaseyi Ayodeji
    This paper reports an IoT-based home automation and weather monitoring system developed for remote control of household appliances and weather monitoring. The proposed system comprises a Wi-Fi enabled ESP32 microcontroller as the network gateway, a relay module, and a DHT11 sensor for monitoring temperature and humidity. The status of the household devices and the weather data are continuously collected and stored in a MySQL database, which is set up on the IoT platform. A user interface was created using two different protocols - HyperText Transfer Protocol (HTTP) and Message Queuing Telemetry Transport (MQTT). The IoT-based home automation and weather monitoring system is designed to be low cost, user-friendly and can remotely control home appliances and monitor weather data over the internet.
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    Household Premises Surveillance System Using Ultrasonic Sensor
    (IOSR Journal of Electronics and Communication Engineering (IOSR-JECE), 2019) Ilori Oluwaseyi Ayodeji
    Motion detectors play a vital role in our daily lives, a very common example is an automatic door which opens when an individual approaches it and closes after the individual has passed through. They are also used in the control of lighting systems; the light is switched on when the sensor detects motion and switched off when no motion is detected. In this article an ultrasonic sensor was interfaced with a PIC microcontroller and a buzzer which makes a beeping sound when an intruder is detected. An ultrasonic sensor was chosen because the range of detection can be distinctively set with aid of the microcontroller and any object outside a specific rage will not be detected. An ultrasonic sensor (HC-SR04) was used and it has a maximum range of about 4 m. Keywords: Ultrasonic, Motion detector, microcontroller
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    Arduino-Based Maximum Power Point Trracking Charge controller using Perturb & Observe and Constant-Voltage Algorithm
    (International Journal of Energy for a Clean Environment, 2023) Ilori Oluwaseyi Ayodeji
    The output power delivered by a photovoltaic (PV) module to charge a battery is dependent on solar radiation incident upon it and the ambient temperature. To reduce PV energy loss, the PV panel is kept at peak efficiency by operating the PV system at the maximum power point (MPP) to deliver maximum power to the battery under charge. In this work, Perturb & Observe (P&O) algorithm was implemented in conjunction with constant voltage (CV), using the MATLAB/Simulink tool. Results obtained from these simulations show that the tracking efficiency of the P&O algorithm decreases with solar irradiation. However, the relatively good performance of the CV algorithm at low irradiation levels augments the P&O method. Both algorithms were implemented in a maximum power point tracking (MPPT) design using an ATMega328 microcontroller operating on a minimal Arduino-compatible integrated development environment (IDE) prototype circuit.