Post on 30-Dec-2015
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Smart Traffic SignsSmart Traffic Signs
I. Designing a Smart Traffic
Sign
II. Demonstrating a Working
Prototype
III. Enhancing the Concept
Think!
Designing a Smart Traffic SignDesigning a Smart Traffic Sign
1. Inclement weather
2. Poor or infrequent placement
3. Stolen for dorm room decoration
General problem – Road signs
do not always convey
information effectively
Designing a Smart Traffic SignDesigning a Smart Traffic Sign
Solution: a “Smart” Traffic Sign
1. Transmits information over a
wireless link
2. Replaces or augments traditional
road signs
3. Delivers information directly
inside a motor vehicle
Designing a Smart Traffic Sign Designing a Smart Traffic Sign
Goal: Deliver a prototype of a Smart Traffic Sign that
Uses a 433.9.2 MHz radio frequency
link
Operates on power supplies available
in cars(receiver) and near interstate
signs (transmitter)
Outputs information to driver on an
illuminated LCD screen
Designing a Smart Traffic SignDesigning a Smart Traffic Sign
System-level architecture
Flash EEPROM Stamp PIC
PIC on the modules
Flash EEPROM
LCD display Stamp PIC
PIC on the modules
Transmitter sends data serially to the receiver
Transmitter:
Receiver:
Designing a Smart Traffic SignDesigning a Smart Traffic Sign
Software components for Modules:
Transmitter: - Encodes information
- Contains Protocol
Receiver: - Decodes Information
- Contains protocol conversion program
- Includes LCD driver
Designing a Smart Traffic SignDesigning a Smart Traffic Sign
Power Supplies:
1. Receiver: Plugs into +12V DC
supply of car’s cigarette lighter
2. Transmitter: Uses 120 V AC supply
of urban bridge structure signs
Designing a Smart Traffic SignDesigning a Smart Traffic Sign
Summary of Specifications:
Frequency of operation 433.92 MHz
Receiver Power Supply 12V DC
Transmitter Power Supply 120 V AC
Display Backlit LCD
Antenna Type Loop
Demonstrating a Working PrototypeDemonstrating a Working Prototype
Packaging the Modules:
Receiver: Small, user-friendly package
that attaches with Velcro
to car’s dashboard
Transmitter: Weatherproof package
enclosing power supply
and module
The First Car!The First Car!
The 1995 Dodge Neon was the first car to have the Smart Traffic Sign installed in it
Demonstrating a Working PrototypeDemonstrating a Working Prototype
Testing the modules in heavy snow
Approximate distance of operation: 300 ft.
Demonstrating a Working PrototypeDemonstrating a Working Prototype
Testing the modules in clear weather
Approximate distance of operation: 310 ft
Demonstrating a Working PrototypeDemonstrating a Working Prototype
Conclusions for test:
1. Weather conditions do not significantly impair
performance
2. Current minimum range is enough to transmit
3072 characters at 9600 baud, more than enough
for the demonstration
Demonstrating a PrototypeDemonstrating a Prototype
Summary of Prototype:
1. Transmitter and receiver housed in appropriate
packages
2. Field tests verified the meeting of project goals
3. Demonstration validated the real-world
operation of the prototype
Enhancing the Concept Enhancing the Concept
A second generation prototype will:
1. Provide more range: increased
receiver sensitivity allows better
range from same transmitter power
2. Decrease size of units: new, smaller
modules could make units more
attractive
Enhancing the ConceptEnhancing the Concept
A second generation prototype will:
1. Use more sophisticated modulation:
improve resistance to noise
2. Provide antenna flexibility: Many types
of antenna could provide directional
transmission
Enhancing a ConceptEnhancing a Concept
Further Improvements:
1. Lane Specificity - provide lane-specific
information, perhaps using a buried
antenna
2. User interface - Determine best method
of getting information to driver
Enhancing the ConceptEnhancing the Concept
Summary of Recommendations:
1. Build a second-generation prototype for
increased performance
2. Develop a method of providing lane
specific information
3. Research most effective user interfaces
AcknowledgementsAcknowledgements
Professor Frank Merat, Project Technical Advisor
Professor Bob Gura, Project management Advisor
Professor Sreenath, Course Instructor
Dr. R.L. Mullen, Civil Engineering Advisor
Brian Leech
Ted Square