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Wireless Low Bridge Avoidance System

Tom Gromko Max Holthaus Group #35. Wireless Low Bridge Avoidance System. Why?. Objectives . Limit Damage to Roadway I nfrastructure Driver Confidence Safe, Reliable, and Cheap P roduct Decrease Threat of “Notorious” Bridges. The Product. Overview. Two component system

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Wireless Low Bridge Avoidance System

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  1. Tom Gromko Max Holthaus Group #35 Wireless Low Bridge Avoidance System

  2. Why?

  3. Objectives • Limit Damage to Roadway Infrastructure • Driver Confidence • Safe, Reliable, and Cheap Product • Decrease Threat of “Notorious” Bridges

  4. The Product

  5. Overview • Two component system • Bridge Based Transmitter (Custom - Programmed for Each Bridge) • Vehicle Mounted Receiver With Alert System • Based on XBee Technology • Bridge Transmitter is Solar Powered

  6. Avoidance System Overview

  7. Bridge Unit

  8. Bridge Unit Hardware • 6V Lead-Acid Battery • Charging Circuit • XBee Pro Transmitter • Continuously Broadcast Parameters • 5W Solar Panel

  9. Bridge Unit Schematic

  10. Bridge Unit Power Accounting

  11. Charging Circuit Performance

  12. Current vs. Time

  13. Bridge Unit Charging Data • Full Sun • Partially charged battery (6.55V). *6hrs sunlight= 2.28Ah/day ~=2.5Ah

  14. On-Board Unit

  15. On-Board Hardware • Used for Data Processing and Signaling • 12V Cigarette Lighter Adapter • 2.4 GHz XBee Pro Provides Wireless Link • Micro SD Card Reader for Modularity • ATMEGA328P-PU Performs Processing

  16. On-Board Schematic

  17. On-Board Software

  18. Bridge Clearance Algorithm • Parabolic Curve Calculation with 5 Parameters • Model Obtained From UIUC Civil Engineering • Determines Height at Worst Point on Curve

  19. Alarm System Overview • LCD Gives Visual Warnings to Driver • Amplifier Drives 8-Ohm Speaker • Speaker Emits Audible Cues to Driver

  20. Amplifier Schematic • Amplifier Gain Close To 200 • 1 - 10 KHz Operating Range

  21. Amplifier Gain Simulation

  22. Amplifier Gain Results

  23. Sensing Unit • Functional to 2 Meters • On-Board Unit Selects Best Reading • Resistant to the Elements

  24. Sensing Unit Results

  25. Known Problems • Range not Satisfactory • Use 900Mhz Instead of 2.4GHz • Solar Panel Power Insufficient • Need MPPT Or Larger Panel • Speaker Noise • Need Filtering • Possible Software Fix • Dead LCD Pixels

  26. Deviations From Original Design • Accurate Model for Bridge Dip • Parabola Instead of Trigonometry • Removed SD Card From Bridge (Saves Power)

  27. Future Hardware Development • More Portable • Smaller Housings • PCBs with Surface Mount Parts • SD Card Reader for Bridge PCB • Improved Battery Performance • Switch to Lithium Ion Battery • Improved Amplifier • A Band-Pass Filter Would Eliminate Some Noise • Improved Range • 900MHz Xbee Pro Devices Have Better Range

  28. Future Software Development • Program Output Pin of ATMEGA328 to Low for Amplifier Output • Eliminate Noise in the Speaker • Leaner Code, Cut Out Bulk • Improved Transmission of Floating Points

  29. Thank You

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