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Design And Implementation Of An Electronic Sign Pattern Display
CHAPTER ONE -- [Total Page(s) 3]
Page 1 of 3
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CHAPTER ONE
1.0 INTRODUCTION
DESCRIPTION/FUNCTIONS OF THE COMPONENTS USED IN THE PROJECT
1. POWERS SUPPLY/TRANSFORMER
The
power supply is culmed produce power required by the component to
function. It coverts line voltage which is AC to DC and to a level that
can be used by the various components. This is achieved by the use of a
step down transformer to step down rectify, filtrate and regulate the
line voltage.
CIRCUIT SYMBOL
THE SHIFT REGISTER
The shift
register is a serial-in, parallel out register, it is responsible for
the display “WELCOME TO ELECT/ELECT DEPT.†WELCOME†comes up frist,
after some time interval which will be determined by the 1MSO resistor
or a variable resistor “TO†come up, followed by “ELECT/ELECT†and
finally “DEPTâ€.
The process is repeated, The counter is a decade
counter with a decorded outputs. It controls the boarder display pattern
in the form of light laser pattern.
The rate at which the lights
display is determined by the frequency of the 55C1MOS timer chip which
acts as a clock generator that generates square wave to the counter.
Hence,
the timing of the whole circuit is controlled by the four 555CMOS I.C.
in the circuit. Each timer controls the sequence of each lamp at the
terminal with the help of the relay drive.
CIRCUIT SYMBOL
RELAY
A
simple relay is made from a coil of wire wound around a soft iron core
with the ends of this coil at erminals, when it is energized the soft
iron core become a magnet and attracts the armature.
The working
principle of simple normally open relay found a wide application in this
circuit for the switching “ON†and “OFF†of the lamps.
CHAPTER ONE -- [Total Page(s) 3]
Page 1 of 3
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ABSRACT - [ Total Page(s): 1 ]This design implementation of this electronic sequential sign post display employs the use of some specialized components. This section of the project introduces the reader to the different section of the project and the components that makes them up.Emphasis are laid on describing the behaviour and operational system of the components as related to the project modeling, analysis, design and implementation of an ELECTRONIC SIGN POST, which is made up of a power supply, a shift register, a counte ... Continue reading---
