1 capstone design project silent alarm system students: su huang & fenghua chen advisor:...
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Capstone Design Project
Silent Alarm System
Students: Su Huang & Fenghua Chen
Advisor: Professor James Hedrick
March 03, 2007
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Current Safety Alert System
Emergency phone booths
Surveillance cameras Wired together
(underground) Connect to Campus
Safety
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Disadvantages of Current System
Slow notification of incident Surveillance cameras have blind spots Fixed in numbers and locations
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What is a Silent Alarm System?
A personal safety alert system Mobile device Wireless transmission Easy, silent activation Instant alert to Campus Safety Better location tracking
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Keychain (student)
Central Station(Campus Safety)
Signal
Signal Signal
Schematic Diagram
Sub.
Substation
Key Chain (Student,
faculty, etc)
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The Big Picture
www.google.com
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The Project
Idea by Nelson Rosario Originally based on Parallax Education Board Migration to C8051 MCU platform Develop a communication platform for software
engineers Develop basic communication protocol Built a standalone prototype on a PCB board
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Design Specifications
Transmit Frequency: 433.92 MHz Transmit Range: 500ft Transmitter Output Power: -4 ~ 8 (dBm) Receiver Output Power: -4 ~ 4 (dBm) Baud Rate: 9600 bps Receiver Sensitivity: -106 ~ -118 (dBm) Meet all FCC and Public Safety regulations
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Hardware Components Microcontroller (C8051) Parallax RF Transceiver Parallax Education Board Keychain
Key Chain 433MHz Transceiver by All Spectrum Electronics
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Block Diagram
Transmitter Station Receiver Station
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Communication Protocol
Transmitter• Check for button
press
• Synchronization Start character
• Message
• End character
• Back to checking
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Communication Protocol (cont)
Receiver• Wait for start
character
• Getting message
• Wait for stop character
• Send alarm
• Back to wait
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Communication Protocol (cont)
Start signal: character “!” Message: can take up to as much as 25
ASCII characters Test message: string “IRE” End signal: character “@”
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Results
Spectrum Analyzer Antenna noise Receiver Sensitivity:
-106 ~ -118 dBm
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Results
Oscilloscope Message Data (no
transmission) Noise only
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State Diagram (Receiver#2)
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LR Receiver and LS Decoder
Linx Technologies®
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Progress Report
A prototype is built Signal/noise measurements using
Spectrum Analyzer Improving protocol to be more flexible
and noise resistant Building filter circuit
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Results
Oscilloscope Message Received !,I,R,E,@
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Results
Xmtrwide With Noise
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Disadvantages
Wireless signal strength problem False Alarms
• Solutions are: fine, lock, save ID on keychain
Device Failure Inaccurate position detection
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Future Thoughts
Open Shortest Path First More accurate position detection (i.e.
GPS) Vibration (feedback to user) Individual ID for each transmitter
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Acknowledgements
Advisor: Professor Hedrick Nelson Rosario
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Questions?