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Chapter 4
Overview of Proposed Solution
4.1 Introduction
This chapter discusses the overall design methodology and illustrates the
operation of the proposed system as a whole.
Although RFID systems have been used to track animals before [3], this
particular application is somewhat different as it is required to be fully
autonomous and low-cost. For this reason, the system is designed from
the ground-up, using generic, off-the-shelf components as far as possible.
The solution is highly modular. Each component is a stand-alone unit
which interfaces with the other modules through communication buses. This
ensures that the custom modules can be replaced by commercial units at a
later date (should the system integrator deem it necessary), without significant
system modification. Figure 4.1 illustrates the proposed interconnections
between the three sections of this project:
1. A module which is able to detect and identify an animal at each gate;
2. A module which controls two of these readers, co-ordinating their readings
and interpreting the results;
3. A module w hich buffers this information before sending it to the user.
Naturally, a power supply and an interconnection are also required. Figure
4.2 shows the logical connections between the modules and indicates the
16
- Low Cost 1
- Penguin RFID Reader 1
- Abstract 2
- Acknowledgements 3
- Declaration 4
- Contents 5
- List of Figures 9
- List of Tables 11
- Glossary 12
- Chapter 1 15
- Introduction 15
- 1.3 Project Timeframe 16
- 1.5 Project Challenges 18
- 1.6 Report Structure 20
- Chapter 2 21
- Analysis of Existing Solution 21
- 2.2 Power Supply 23
- 2.4 Data Delivery 25
- Chapter 3 26
- Device Specification 26
- Chapter 4 29
- Overview of Proposed Solution 29
- 4.3 Uplink Module 31
- 4.4 Interconnections 32
- 4.5 Power Supply 32
- Chapter 5 33
- RFID Reader Design 33
- 5.1.3 Operating Frequency 37
- 5.3.1 64 Data Bits 42
- 5.3.2 CRC Verification 42
- 5.4 Hardware 43
- 5.4. HARDWARE 49
- 5.4.5 Processor 53
- 5.4.6 Interface 56
- 5.4.7 PCB Layout 56
- 5.5 Software 57
- 5.5.2 Capture Stage 58
- 5.5. SOFTWARE 60
- 5.5.3 Decode Stage 61
- 5.6 Design Evaluation 63
- 5.6.4 Power Consumption 67
- Avnett Kopp, September 2006 69
- ZAR9.50 to 1 Euro 69
- Chapter 6 70
- RFID Co-ordinator 70
- 6.2 Software 71
- 6.2.1 Timers 72
- 6.2.2 RFID Reader Request FSM 72
- 6.3 Evaluation 75
- Chapter 7 76
- Uplink Design 76
- 7.3 Hardware Design 80
- 7.3.2 Processor 83
- 7.3.3 User Interface 84
- 7.3.4 Power Supply 85
- 7.4 Software De sign 88
- Except for the I 89
- Details in Section 7.4.5 89
- 7.4.2 Real Time Clock 90
- 7.4.3 User interface 90
- 7.4.4 Peripheral Poll FSM 91
- 7.4.6 Timer FSM 93
- 7.4.7 GSM FSM 94
- 7.4.8 Report Generation FSM 97
- 7.5 Reliability 98
- 7.5.1 Software 99
- 7.5.2 Hardware 100
- Chapter 8 102
- Power Supply 102
- 8.3 Regulator Selection 103
- 8.4.1 Hardware 107
- 40% of 7.5Ah 110
- 8.4.2 Software 111
- 8.5 Measurements 113
- 8.6 Conclusion 114
- Chapter 9 115
- Enclosure Selection and 115
- Mounting Methods 115
- 9.2 Recommendations 116
- Chapter 10 118
- South African Regulations 118
- 10.1 GSM Module 119
- 10.2 RFID Readers 119
- Chapter 11 120
- Conclusion and System 120
- Evaluation 120
- Appendix A 122
- Appendix: RFID Receiver 122
- DUAL-CHANNEL RECEIVER 123
- Appendix B 127
- Appendix: RFID Co-ordinator 127
- B.2. PCB LAYOUT 128
- Appendix C 130
- Appendix: Uplink Module 130
- C.2 List of Uplink Commands 131
- C.3 PCB Design 131
- C.3. PCB DESIGN 133
- Appendix D 137
- Appendix: Power Supply 137
- Appendix E 139
- Appendix: Software 139
- References 140
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