Abstract:
The effect of science and technology had led to the development of computers and its application to various production fields. EAR is a new type of attendance software. It is aimed at eliminating the old method of keeping records of staff attendance on daily bases, through electronic means.
TABLE OF CONTENTS:
CHAPTER ONE
INTRODUCTION
1.1 LITERATURE REVIEW (INTRODUCTION)
1.2 COMPONENTS REVIEW
1.2.1 INTEGRATED CIRCUIT (ICs).
1.2.1.1 : MICRO CONTROLLER (8952)
1.2.2 REGULATOR 7805
1.2.1.4 BUFFER 74244
1.2.1.5 THE 555 TIMER
1.2.2 ACTIVE COMPONENTS
1.2.2.1 TRANSISTOR
1.2.2.2 RECTIFIER DIODES
1.2.2.3 (LED) LIGHT EMITTING DIODES
1.2.2.4 CRYSTAL OSCILLATORS
1.2.3 PASSIVE DEVICES
1.2.3.1 RESISTORS
1.2.3.2 TRANSFORMER (STEP-DOWN)
1.2.3.3 SWITCHES (THE MICRO-SWITCH (SOFT TOUCH/PUSH) BUTTON SWITCHES).
CHAPTER TWO
DESIGN AND IMPLEMENTATION
2.1 DESIGN OF THE 5 VOLT DC REGULATOR POWER SUPPLY MODULE
2.1.1 POWER SUPPLY MODULE
2.1.2 THE STEP-DOWN TRANSFORMER
2.1.3 RECTIFICATOIN PROCESS
2.1.4 GENERAL POWER CIRCUIT OPERATION
2.1.5 CALCULATION ON POWER MODULE
2.1.6 CALCULATION ON TRANSFORMER
2.1.7 CALCULATION ON RECTIFICATION
2.1.8 ANALYSIS AND CALCULATION ON FILTERING
2.2 DESIGN OF THE DISPLAY MODULE
2.3 MICRO-CONTROLLER MODULE
2.3.1 1/0 PORT PINS AND THEIR CONFIGURATIONS
2.3.2 GENERAL OF THE PULSES (IN SECONDS)
2.4 CONSTRUCTION
2.5 TESTING
2.6 COST LISTING
CHAPTER THREE
DISCUSSIONS AND CONCLUSIONS
3.1 DISCUSSIONS
3.1.1 TROUBLE SHOOTING THE DESIGN
3.1.2 RESULT
3.1.2 PROBLEMS ENCOUNTERED
3.2 CONCLUSIONS
APPENDIX
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