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Wireless Low Bridge Avoidance System

DESCRIPTION

The Wireless Low Bridge Avoidance System, developed by Tom Gromko, Max Holthaus, and their team, aims to safeguard roadway infrastructure and enhance driver confidence. This two-component system consists of a bridge-based transmitter and a vehicle-mounted receiver featuring an alert system powered by solar energy and XBee technology. Key objectives include minimizing damage from vehicle impacts, providing a reliable and affordable solution, and mitigating risks from known problem bridges. Future advancements aim to improve portability, power efficiency, and range for optimal performance.

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Wireless Low Bridge Avoidance System

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Presentation Transcript

  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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