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Figure 2.8-2. Image provided with permission from by sparkfun.com

With 3.16 x 3.95”, it will be substantial for mounting our microcontroller in addition

to input and output elements. Our second choice would be the WM-46 from

Pactecenclosures.com it is also a quality enclosure at a low cost. Figure 2.8-2

and 2.8-3 shows the general appearance and followed by detailed drawing.

Figure 2.8-3 Image provided with permission granted by Pactech Enclosures

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 147 148

Senior Design Group 8 1
May 3, 2010 1
TABLE OF CONTENTS 2
1. Introduction 4
1.2 Motivation 5
1.3 Goals and Objectives 6
1.5 System Overview 12
2. Research and Requirements 13
2.2 System Logic 15
2.2.3 Microcontroller 20
2.3 Voltage Regulator 23
2.3.1 Requirements 24
2.4.1 USB 31
2.4.2 Serial (RS232) 32
2.4.3 Non-Standard Connector 33
2.4.4 RJ-45 (Out of Spec) 34
2.4.5 USB (Out of Spec) 35
2.4.6 Wireless 36
2.5 LEDs 37
2.6 Software 40
2.7 Interlock Device 44
2.8 Enclosure 45
Control Box Enclosure 46
Hand-held Unit Enclosure 49
2.9 Display 51
2.9.2 Dot-Matrix Display 52
2.9.3 Liquid Crystal Display 53
2.10 Alcohol Sensor 54
Fuel Cell Sensors 57
2.11 Battery 59
2.11.1 Alkaline Battery 60
2.11.4 Lithium Ion Battery 63
2.11.5 Lead Acid Battery 64
2.11.6 Zinc Nickel Battery 66
2.11.7 Battery Comparison 66
2.12 Charging Circuit 67
Colin Mitchell of 70
2.13 Airflow Measurement 74
2.13.2 Pitot Tube 75
3. Hardware Design 77
3.2.2 Wireless 83
3.2.3 Programming 83
3.2.4 Analog Sensing 85
3.3 Power Supply 86
3.4 Display 91
3.6.1 Breadboard 93
3.6.2 Perforated Board 93
3.6.3 Printed Circuit Board 93
3.8 Enclosure 97
Figure 3.8-1 Voog Concept I 98
Figure 3.8-2 Voog Concept II 99
4. Software Design 103
4.2 Communications 106
4.3 Portable Unit Software 109
4.3.1 Display Functions 110
4.4 Control Unit Software 111
5. Testing and Validation 114
5.1.3 Enclosure 115
5.1.4 Display 115
5.1.2 Gas Detection Sensor 115
5.2 Hardware Test Procedure 116
5.2.3 Verifying Enclosure 119
5.2.4 Verifying Display 119
5.3.1 Hand Held Software 122
5.3.2 Control Box Software 122
5.4 Software Test Procedure 123
5.5 System Test Procedure 124
6. Administrative Materials 129
6.2 Project Planning 130
6.2.2 Spring 2010 Semester 131
6.3 Cost Estimates 132
6.4 Bill of Materials 133
6.5 Design Team 136
Appendix A 137
A.2 Permissions 138
A.2.3 Talkingelectronics.com 139
A.2.4 Greenbatteries.com 140
A.2.5 Batteryspace.com 140
A.2.6 Sparkfun.com 141
A.2.7 reuk.co.uk 142
Thanks 143
A.2.12 SI Micro 144
A.2.13 Newhaven Display 145
A.2.14 Matrix Orbital 146
A.2.15 Phidgets 147
A.2.15 Binder USA 147
A.2.16 ST Micro 148

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