The aim of
this project work is to design and construct an electronic digital display
system, based on light-emitting diodes connected in an array that forms the
information to be displayed i.e. “GREAT
NIGERIAN STUDENTS”. This project is useful for creating
attention – getting messages, presentations, advertisements and location
identifiers. The system consists of power supply unit, oscillator unit, counter
unit, driver unit and output unit. The power supply unit uses alternating
current (AC) from the mains which will be stepped down to 12V using a step-down
transformer, rectified with bridge rectifier, filtered with the actual
capacitor and regulated to 9 volt using an IC regulator. The oscillator unit
contains a 555 timer IC set as astable multivibrator used to produce clock
pulses for the counter unit which contains 4017 decade counter IC. The 4017
counter enables the information to be displayed sequentially as desired. The
driver unit uses transistor to amplify the signal strength of the counter’s
output. The output unit enables the information to be displayed using light
emitting diodes (LEDs).
Table of Contents
CHAPTER ONE: INTRODUCTION
Statement of the
Scope of the
CHAPTER TWO: LITERATURE
CHAPTER THREE: MATERIALS
Electronic Digital Display System
CHAPTER FIVE: DISCUSSION,
CONCLUSION AND RECOMMENDATION
Cost of Construction
List of plate
Plate 1: The photograph of the constructed
electronic digital display system
List of tables
Table 1: Experiments carried out and
List of figures
2.1: Symbol of a transformer
2.2: Circuit symbol of bridge
2.3: Symbol of a polarized and
2.4: Symbol of a diode
2.5: Symbol of a LED
2.6: Circuit diagram of rectifier
diode and LED connected in
2.7: Pinout connection of 7809IC
2.8: Symbols of fixed and variable
2.9: Symbols of transistor
Pinout diagram of 555 timer
Pin connection of 4017 decade counter
Fig.2.12: Diagram of a veroboard
3.1: Block diagram of electronic
digital display system
3.2: Circuit diagram of full wave
Circuit diagram of a 9 volt
regulated power supply
Circuit diagram of a stable
Complete circuit diagram of
electronic digital display
1.1 Background of the study
Electronic digital display system as used in this
reports refers to a sign that uses electronic hardware and software to display
its copy, messages or images. Also, a sign utilizing a fixed light source to
provide a message in text, images
pictures, and / or symbols that may appear to move or may appear as on/off
messages. This is contrast to traditional non-electronic signs where the copy
displayed is physically applied to the sign surface by printing, painting or
otherwise attaching it onto the sign. The materials or substrate to which the
copy is applied is typically paper, wood, plastic or the wall of a building.
this modern time, solid materials have helped man to show that he really exists
by doing wonders in the world of electronics. One major development, made
possible by the enormous advances in solid state technology, is the “digital
revolution”. Circuits are designed to implement the basic digital logic
functions fundamental to all digital systems. Digital electronics therefore comprises
the design, manufacture and use of circuits for processing information in
digital form (Simpson, 1978).
information display is a way of providing information and it is also used as an
object for promotion. It can be seen in a form of cardboard or tarpaulin at
stores / shops, sign posts, placards, notice boards and electronic display boards.
But the advent of new technologies has made the information in the form of an
electronic display in the world of advertisements and promotions (Gupta, Shukla
and Nagwekar, 2013). The ability to display a short message can be useful
application to be available for any business. Electronic digital display system
is perfect for this application. It can be used for both indoor and outdoor
which makes it universal fit for any business or event. Electronic digital
display system is very efficient and cost effective way to spread messages to
thousands of people, without any personal contact or door to door sales. Light-Emitting
Diode (LED) is a solid state light source with several attractive properties
for display application. LED is a diode that gives off visible light when
forward biased (Mehta and Mehta, 2014). It is chosen as the main component for
displaying messages because, today LED is the most energy efficiency example and
other useful systems.
birth of signs and display can be said to be as old as the existence of man on
the planet earth. From the beginning of the world, different types of displays
have been in use, each mode to serve the purpose of invention efficiently. Signs
are any kind of visual graphics created to display information to a particular
audience (David, 2013). In 1389, King Richard II of England compelled landlords to
erect signs outside their premises (Manton, 2008). In ancient Rome, signboards were usually made from stone
or terracotta (Chris, 1995).
the advancement in technology, man started carving woods and trees. The use of
special dyes on wood as a means of identifying special locations. With the
discovery of Bronze and iron, man started using the materials to display sign,
thus the advent of metal sign boards were born, which are mostly used in
developing countries. On semiconductors and vacuum tubes technology, light displays
and sign boards were built to add more beauty in the old system and as a way to
increase visibility. LED technology is frequently used in signs now instead of
Neon signs, introduced in 1910 at the Paris Motor show (Bellu, 2006). The use
of electronic is now becoming very
important. It is extensively applied in almost our day to day activities.
digital display system is also used for outdoor advertisement. Before, outdoor
advertising was mainly characterized by the use of paper. Every bus stop and
billboard had a paper advertisement inside. The reason for this was simple
paper was easy to use and extremely cheap. It had some draw backs as well. Before an image is actually on the
street, it first has to be printed, pasted and placed. The journey from design
to placement is quite long. Another disadvantages is the considerable amount
waste generated by the use of paper. Finally, many people ignore a paper
advertisement and there attention is drawn to the vibrant environment around
them and not to a still image.
extent of development in information dissemination has made it possible that
the well known method of displaying information using sign posts, notice
boards, etc has to be modified by using electronic digital display system. In
today’s rapidly advancing technology market, most conventional digital display
system are not being implemented using individual logic gates and integrated
circuits (ICs) such have been used in the past instead, programmable devices
such as microprocessor and microcontroller chips which contain the circuitry
necessary to create logic functions are being used to implement digital
systems. The use of 555 timer as a stable multivibrator and decade counter
(CD4017) can be used to build less expensive electronic display system. The use
of these two major ICs will bring about less board space, less power
consumptions and overall, low cost in manufacturing.
project however; emphasizes mainly on the display of information using two
major integrated circuits (ICs) namely NE555 timer (ICI) and CD4017 (IC2) to
control the lighting of LEDs. This message display circuit is built around
readily available, low cost components. It is easy to fabricate. A total of 250
LEDs will be used to display the message “GREAT NIGERIAN STUDENTS”
1.2 Statement of the Problem
to limitation of the sign board or local sign board which could not display
clearly at night expect light shines on it, it is then necessary that
electronic display system is employed to counter the limits of the local sign
board. The information displayed on the local sign board is less attractive
compared to the information displayed using electronic digital display system.
researchers are prompted to tirelessly hold up to these challenges by
initiating some means of improving the above among which is the design and
construction of an electronic digital display system.
1.3 Objectives of the Study
main objective of this study is to design and construct an electronic digital
display system. Specifically this study will achieve the following:
display “Great Nigerian students”
ii To use the electronic digital display
system constructed as a sign post for federal polytechnic, Oko.
iii To have more knowledge on what electronic
digital display system is all about.
v To know the benefits of electronic
digital display system.
v To design and realize the moving message
of the Study
In all field of human endeavour, electronic digital
display system plays very vital role, such as means of advertisement, means of
communication, presentations, exhibitions, identification and direction. It is
also used in giving warning or safety instructions, such as warning signs,
traffic signs, exit signs or signs conveying rules and regulations. This
project write-up will be a guide to future designing in a related work.
of the Study
This project covers the use of peripheral solid
state electronic components alongside with two major integrated circuits (ICs)
namely NESSS timer and CD4017 decade counter to solve above stated problems. It
is limited to display GREAT NIGERIAN STUDENTS
1.6 Research Questions
This research will try to provide answers to the
following research questions:
1) What is
electronic digital display system?
2) How can
electronic digital display system be constructed?
are the users of electronic digital display system?
are the benefits of electronic digital display system?
5) What kind of content that can be shown on
electronic digital display system?
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