University of Africa Toru-Orua
Digital Repository
Welcome to the University of Africa Digital Repository, which collects, preserves, and disseminates the University's scholarly outputs.
Faculties in University of Africa Toru-Orua
Select a Faculty to browse its departments.
- This contains the intellectual works of the faculty members in Agriculture
- This contains the intellectual works of the faculty members in the Arts & Education
- This contains the intellectual works of the faculty members in the Faculty of Basic & Applied Sciences
- This contains the intellectual works of the faculty members in Social & Managment Sciences
- This contains the intellectual works of the University Public Lectures / Events
Recent Submissions
Development of an Automatic Body Mass Index Measurement Machine
(2019-05-12) Theophilus Ewetumo, Kayode D. Adedayo, Yusuf B. Lawal, Abiodun T. Edun and Joseph E. Orokhe
The potential occurrence of certain illnesses can be easily diagnosed through measurements of some health indicators. One of
such parameters is the Body Mass Index (BMI). BMI is simply the ratio of mass (kg) of a body to the square of its height (m2
). This research presents the design and construction of an automated BMI measurement machine for medical purposes. It consists of three major units: the
weighing unit (5 – 200 kg); height-measuring unit (0.02 – 2 m) and the processing unit. The weighing unit is made up of load button cell and
load cell amplifier while the height-measuring unit consists of ultrasonic sensor. The analog differential output voltage from load cell is
connected to Arduino microcontroller via a Programmable Gain Amplifier (PGA) integrated with Analogue-to-Digital Converter (ADC). The
two units are connected to an open source Arduino Uno which computes mass-to-body ratio and sends the output results (mass, height and
BMI) to the liquid crystal display (LCD). The weighing system was calibrated against a precision digital weighing system and it gave a
correlation of 0.99. The height measurement was also compared with manual height measurement using a tape rule which gave a
correlation of 0.97. The developed Instrument is cost effective and has high positive correlation with the standards (weighing scale and tape
rule), it is therefore recommended for the measurement of weight, height and BMI.
Development of Viscosity Measuring Device Using Vibrational Technique
(2018-07-23) T. Ewetumo, K. D. Adedayo, M. A. Sodunke and Y. B. Lawal
The project centers on the development of viscosity measuring device using vibrational techniques.
The instrument consists of a variable power supply, two solenoids each with plungers, needle with
a pendulum bob attached, switching circuit, current – voltage sensors, microcontroller, analog–to–
digital converter and Liquid Crystal Display (LCD) unit. The developed system consists of a variable
power supply used to create varying magnetic fields in the solenoids so that the plungers can
attract and release the pendulum bob. As the magnetic field strength varies, the pendulum
experiences force sufficient to overcome the internal friction within the liquid. The pendulum bob is
thus set into periodic to and fro motion. The pendulum bob movement was monitored by a
microcontroller through a reflective optical sensor. Viscosity was measured through the calibration
constant generated from a liquid of known viscosity, applied voltage, current generated from the
solenoids and the dragging time. Gear oil, engine oil, palm oil, olive oil were the fluids investigated with the developed system for performance evaluation. Statistical analysis revealed a percentage
error value of 2.87% and accuracy of 97.13% which shows a good agreement between the
standard and what is available in the literature. The instrument performed well and it is therefore
suitable for the measurement of liquids' viscosities.
Development of a Microcontroller Based Heat Index Meter
(JOST, 2023-04-07) Lawal, Y.B.
The research focuses on the development of a heat index meter using
microcontroller technology. A DHT22 thermo-hygrometer sensor was employed to measure
ambient temp and relative humidity simultaneously. The analogue values of these parameters
were fed into Arduino Uno Microcontroller which is the heart of the developed meter. The
microcontroller has been programmed to compute the heat index using an embedded equation.
The microcontroller is interfaced with a 16 by 2 Liquid Crystal Display (LCD) to display the
measured temperature, relative humidity as well as the computed heat index. The developed
instrument performed satisfactorily during testing and evaluation. It is therefore recommended
for measurement and monitoring of heat index.
Design and Construction of a Two Channel Microcontroller Based Remote Control for Switching Electrical Appliances
(ABUAD, 2020-04-14) Mobolaji Aduramo SODUNKE, Adeyemi Idris OLATEJU, Yusuf Babatunde LAWAL, Joseph Ogheneruemu ODIETE, Taiwo Titus ABATAN, Waliu Olayemi MUFUTAU
This paper presents the design and development of a microcontroller-based system that can switch off and on Electrical
appliances or wall sockets at user’s will remotely. This research is aimed at increasing the accessibility as well as response rate to
prevent appliances from damage due to transient, intermittent and fluctuations in power supply. This system uses a wireless telemetry
technique through an infra-Red (IR) transmitter and receiver to control the switching state of home and laboratory/industrial electrical
or electronic devices. The entire circuit is built around ATMEGA-328P microcontroller which was programmed to interpret digital
signal sent from the IR transmitter (remote control) to the IR receiver. As the microcontroller receives a real time signal from the IR
transmitter through the IR receiver module, a command is sent to the relay switching unit which activates or deactivates the channel(s)
based on the software code embedded in the microcontroller. The normally open (N/O) and normally closed (N/C) terminals of the relay
are connected to the live terminals of AC sockets for automation. The Liquid Crystal Display (LCD) displays the status of the sockets in
any of the two channels (points) as instructed by the microcontroller. The system is cost effective, durable and versatile as it can be
applied to any devices connected to electrical socket outlet.
DESIGN AND CONSTRUCTION OF A DARK-ACTIVATED EMERGENCY MAINS FAILURE TORCH
(GVU Science, 2023-08-02) Dada, J. B.1* and Lawal, Y. B.
This paper presents the design and construction of a dark-activated emergency mains failure (DAEMF) torch mounted
on a printed circuit board (PCB). The battery-powered torch called a DAEMF is intended to automatically light up a
home and its surroundings in the dark, but it will turn off if it detects the presence of a power source, even if the
lighting system is not on. The charging, switching, and lighting sections comprise the three main sections. During the
dark period, the switching circuit was switched ON by a voltage of 1.7 volts, and a current of 0.006 mA measured
across the light-dependent resistor (LDR) at the switching section. The charging section uses a linear Integrated Circuit
(IC) LM 317 as the main electronic component to charge the battery with about 0.65A load current. The high-voltage
transformer (HVT) at the lighting unit inverts and converts a 12 Volts direct current (DC) to approximately 100 Volts
alternating current (AC) to drive the 6 watts 12 volts fluorescent tube in the lighting section to illuminate the household
and its surrounding for 10.5 hours of continuous use