DESIGN AND CONSTRUCTION OF AUTOMATIC HAND DRYER WITH TEMPERATURE DISPLAY

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ABSTRACT

This project work deals on the design and implementation of an automatic hand-dryer with display capable of drying up a wet hand inserted under its vent and goes off automatically as soon as the ands are removed.  The system also incorporates a decimal counting unit that displays the temperature of the blown out air in 0C.  This system is configured using an optp-coupler realized with cadmium-sulphide photocell (c.d.s) at the input.  The output of the sensor is conditioned by quad-2-input schmit trigger NAND gate (74132) which serves as the control logic used to trigger a one-shot delay that biases a transistor switch. The transistor commutes a TRIAC (solid state relay) that switches on/off the blower connected to it.  When a wet hand is inserted under the vent and blocks the line-of-sight of the sensor, the blower starts to blow automatically as long as the hands are still blocking the c.d.s, else it will stop.  The seven-segment display displays the temperature of the blown out air in 0C and resets simultaneously with the switching off of the dryer.  


TABLE OF CONTENT

Title Page
Abstract

CHAPTER ONE
1.1       Introduction
1.2       General Description Of The Project
1.2       Objective Of The Project
1.3       Significance Of The Study
1.4       Scope Of The Project
1.5       Project Report Organization

CHAPTER TWO
2.1       Literature Review                                                      
2.1.1    Historical development of the project
2.1.2    Theories relevant to the design
2.1.3    Areas of applications of the system
2.1.4    The decimal counting unit (DCU)
2.1.5    The blower
2.1.6    The IC linear temperature sensor
2.1.7    The optical light sensor using LDR
2.1.8    The control logic circuit (74LS132)
2.1.9    The Ne555 timer
2.1.10  The LM339 Quad comparator with hysteresis
2.2       Other Circuit Components
Transistor, Electromagnetic relay, power transformer, junction diodes, resistors capacitors and IC linear voltage regulator

CHAPTER THREE
3.0       System Design And Analysis
3.1       Description Of The System Building Blocks
3 .2      Block Diagram Development Into Working Circuit
3.3       System Design Specifications
3.4       Power Supply Unit
3.5       Principle Of Operation Of The System
3.6       System Design Calculations

CHAPTER FOUR
4.0       Implementation, Testing And Result
4.1       Implementation
4.2       Testing
4.3       Result
4.4       Packaging
4.5       Bill of Engineering Quality

CHAPTER FIVE
5.0       SUMMARY, CONCLUSION AND RECOMMENDATION
5.1       SUMMARY OF ACHIEVEMENT
5.2       CONCLUSION
            REFERENCES

CHAPTER ONE
INTRODUCTION
Engineering is concerned with goal-oriented projects.  Projects that can eliminate problems like time lapse, strem and energy spent, cost and environmental dangers/hazards.  This project work on the design and implementation of an automatic hand-dryer with temperature display is built to eliminate the dangers and problems associated with the manual process of hand-dryer and to display the temperature of the air used in drying the object.  This project is realized with passive and active components.  And it is pure hardwired in that it does not use micro-program control.

1.1   GENERAL DESCRIPTION OF THE PROJECT
        This project design and implementation of automatic hand-dryer with temperature display is achieved in several blocks all combined to form one functional unit.  The first block in the opto-coupler realized with laser diode and LDR whose output is conditioned by 74LS132 that generates control logic.  This control logic is used to bias a transistor switch that energizes the electromagnetic relay which switches the dryer. The control logic is also used to trigger/power the temperature display circuit.  This section is realized with IC linear temperature sensor (LM35) whose output is fed to a quad-comparator with Hysteresis.  This comparator output reset a frequency generator which is counted by a 2-digit decimal counting unit that displays the temperature of the blowers air in degree calcius.  The system dries the hand and displays the temperature using seven segment display.

1.2   OBJECTIVE OF THE PROJECT
        The major objective of this project is to design and implement automatic hand-dryer with temperature display.  The project is also aimed at familiarizing the graduates of Computer Engineering in electronic system designs involving digital systems and random logic.  The project is aimed at acquainting the young graduate on the ethics of Engineering, technical and scientific writing which forms the nucleus of Engineering professional practice.  It is also aimed at testing/accessing the young Engineers ability to realize engineering project within a specified time.

1.3   SIGNIFICANCE OF THE STUDY

        This project design and implementation of automatic hand-dryer with temperature display signifies a lot in automation and control.  It means a lot in CEE, EEE and Physics and Electronic.  This project is a marketable product for homes and restaurants.  A project of this type if properly modified, can function as a temperature control system for server room, kiln and ovens.


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This is an Undergraduate Thesis and the complete research material plus questionnaire and references can be obtained at an affordable price of N3,000 within Nigeria or its equivalent in other currencies.


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