CHAPTER ONE
INTRODUCTION
The purpose of this project is to produce a narrative description of the
design and construction of a microcontroller based dot matrix advert display.
Firstly computer aided design is the modeling of physical system on Computers allowing
both interactive and automatic analysis of design variant and the expression of
design in a form suitable for manufacturing. This follows by explaining the
microcontroller based dot matrix advert display as a device which is fast
gaining wide acceptance and application in the present days due to its ability
to provide a very high precision timing. The dot matrix advert display can be
describe as an electro-mechanical system
for processing information in which the information is represented by physical
quantities, which are so constrained to take only discrete values that can be
referred to as binary signals.
In this design we have implored the
use of both hardware and software to bring about the entire project. The
hardware components are solely coordinated by the AT89S51 micro controller chip
while the C- programming language is used to program the chip.
1.1 OBJECTIVE
OF THE PROJECT DESIGN
Depending on ones intention,
microcontroller based dot matrix advert display system have many aims and
objectives.
For instance, this one in particular
aims at displaying a moveable coded letters that says ‘UNIVERSITY CAFETERIA”
Also
microcontroller based dot matrix advert display system can be used to control
the traffic misunderstanding among motorists especially in junctions. This is
achieved by displaying stop, get ready, or move. Some traffic control
electronic system displays symbols or color that represents the stated commands
above
Moreover, microcontroller based dot
matrix advert display system is used in electronic scoreboard during football
matches to display when a goal is scored, also to display the name of that
player who scored the goal. Above all, this system has contributed a lot in
boosting advertisement.
1.2
PREAMBLE
Micro controller programmable Dot
matrix information display system, is a system electronically designed and
constructed, that is used to display different information to the view of the
masses. The information to be displayed could be diagrams, symbols, letters,
colors, numbers, codes, etc depending on what is needed at a particular place
and time. This without doubt, has made life easier for the people in different
ways; however micro-controller, which is the heart of this system, can be
described thus: A micro controller is a computer. All computers, whether we are
talking about a personal desktop computer you are using is a general – purpose
computer that can run any of thousands of programs. Micron-controllers are
special purpose computers. Micro controllers do one thing well. There are a
number of other common characteristics that define micro controllers. If a
computer matches a majority of these characteristics, then you can call it a
micro controller,
1)
Micro
controllers are embedded inside some other device (often a consumer product) so
that they can control the features or actions of the product. Another name for
a micro controller, therefore, is embedded controller
2)
Micro
controllers are dedicated to one task and run one specific program. The program
is stored in ROM (read – only memory) and generally does not change. Micro
controllers are often low power devices. A desktop computer is almost always
plugged into a wall socket and mighty consumes 50 watts of electricity. A
battery-operated micro controller might consume 50 milliwatts.
3)
A
micro controller has a dedicated input device and often (but not always) has a
small LED or LCD display for output. A micro controller also takes input from
the device it is controlling and controls the device. Meanwhile the use of a
micro-controller to implement an electronic display system design made up of
LEDs connected in common cathode matrix form is referred to as micro-controller
based programmable dot matrix information display system. This project design
is a welcome compliment that displays ‘UNIVERSITY CAFETERIA’
1.3 JUSTIFICATION
OF THE PROJECT
Due
to the various problems encountered in the manual/analog design and
construction of signposts for advertisement, there is every need for an
automated electronic display system that will solve this problem. This will
ensure that viewers get the adequate information that is displayed in good and
attractive colors. The though the manual/analog way of displaying information
to the view of the people is still targeted viewer are attracted. The height in
which advertisement in Nigeria
1.4 SCOPE OF THE PROJECT
This project can serve in any aspect
of life this project (microcontroller based dot matrix advert display) is based
on a computer aided design. .
In the implementation of this project, the
scopes that I shall concentrate more on are:
the architecture of the microcontroller port interface, multiplexing the
data port control sequence and algorithm of the traffic light. The features of the
AT89S51 were exploited to achieve the
desired sequence of operation of this project.
1.5 CONSTRAINTS
One
of the obvious constraints I had in the course of this project was the scarcity
of sometimes outright unavailability of some of the required components in the
markets. Since scarcity is followed by a hike in price, when such components
were even found, they were out rightly expensive. Another major constraint I
had was time constraints. I had a relatively short time to source out materials
from net, libraries, etc, fully understand the underlying principles and come
up with a design that would work. As a result, I had to forgo pleasure and even
leisure in order to achieve this.
