<p> </p><p>Figure 1.8: Project Organizations Block Diagram- – – – 8<br>Figure 2.3: Ventilator Automatic Gas Detector [8] – – – 13<br>Figure 3.2 Block Diagram Design of the System– – – 23<br>Figure 3.3.1 Mq-6 Gas Sensor [9] – – – – – 25<br>Figure 3.5: Transistor Buffer– – – – – – 27<br>Figure 3.7: Dc Regulator [10]– – – – – – 28<br>Figure 3.8: Buzzer [11]- – – – – – – – 30<br>Figure 3.9: Light Emitting Diode [12]- – – – – 31<br>Figure 3.10: Four Types of Diodes [13]- – – – – 32<br>Figure 3.11: Electrolytic Capacitor [14]- – – – – 33<br>Figure 3.12: Fix Resistor [15]- – – – – – 35<br>Figure 3.13: A Toggle Switch [16]- – – – – – 36<br>Figure 3.14: Four Types of Transistor [17] – – – – 36<br>Figure 4.1: systematic Circuit diagram of the project – – – 40<br>Figure 4.1:1 Circuit diagram of the project- – – – – 41<br>Figure 4.2: PVC wire [18]- – – – – – – 42<br>Figure 5.4:1 The picture of the project- – – – – 48</p><p>TABLE OF CONTENTS</p><p>Title page — – – – – – – – – – i<br>Certification – – – – – – – – – – ii<br>Approval page – – – – – – – – – – iii<br>Dedication – – – – – – – – – – – iv<br>Acknowledgement – – – – – – – – – v<br>Abstract – – – – – – – – – – – vi<br>List of figure – – – – – – – – – – vii<br>Table of contents – – – – – – – – – – viii</p><p>

Chapter ONE

</p><p>Introduction<br>1.1 Background of Study- – – – – – – – 1<br>1.2Problem Statement– – – – – – – – 3<br>1.3 Aim and Objectives – – – – – – – – 5<br>1.4 Significant of the project – – – – – – – 6<br>1.5 Scope of Study – – – – – – – – – 6<br>1.5 Justification of the Project – – – – – – – 6<br>1.7 limitations – – – – – – – – – 7<br>1.8 project report organization – – – – – – – 8</p><p>

Chapter TWO

</p><p>Literature Review<br>2.1 History of Gas Detection system – – – – – – 10<br>2.2 History on Gas Detector Development- – – – – 11<br>2.3 How Gas Detectors Work- – – – – – – 12<br>2.4 Methods of Gas Detection- – – – – – – 13</p><p>

Chapter THREE

</p><p>3.1 Design Methodology – – – – – – – – 21<br>3.2 System Design Method – – – – – – – 23<br>3.3 System Analysis – – – – – – – – 24<br>3.4 Circuit working – – – – – – – – 26<br>3.5 microcontroller unit – – – – – – – – – 26<br>3.6 power supply unit — – – – – – – – 27<br>3.7 DC regulator – – – – – – – – – – 28<br>3.8 Other components used in the project – – – – – – 29<br>3.9 LED – – – – – – – – – – – 31<br>3.10 Diode – – – – – – – – – – – 31<br>3.11 Capacitor- – – – – – – – – – 32<br>3.12 Resistors – – – – – – – – – – 33<br>3.13 Switch- – – – – – – – – – – 35<br>3.4 Transistor – – – – – – – – – – 36</p><p>

Chapter FOUR

</p><p>System Implementation<br>4.1 Construction procedures – – – – – – – 38<br>4.2 Interconnection of components – – – – – – 41<br>4.3 Software implementation – – – – – – – – 42<br>4.4 Program hex file- – – – – – – – – 43<br>4.5 Project costing – – – – – – – – – 44</p><p>

Chapter FIVE

</p><p>System Testing and Packaging<br>5.1 System Test – – – – – – – – – 46<br>5.2 Test Plan and Test Data – – – – – – – 46<br>5.3 Components Test – – – – – – – – 47</p><p>5.4 Packaging – – – – – –</p> <br><p></p>