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Innovative Laser Tag System Design and Implementation

This project presents the design and implementation of a Laser Tag System, consisting of a laser gun, vest, and game server with wireless updates. Capable of supporting up to 16 players across 4 teams, the system features IR transmission, real-time game score updates, and user feedback through vibrations and sound. Powered by robust NiMH batteries, it enables gaming for up to 5 hours. The project utilized cutting-edge components like the dsPIC30F3011 processor and Xbee wireless technology to ensure efficient communication and gameplay. Development was guided through the frameworks of Electrical and Computer Engineering courses at the University of Michigan-Dearborn.

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Innovative Laser Tag System Design and Implementation

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  1. Laser Tag System Chris MikolajeskiGreg MatsuraNeil Krzyske ECE 4982 – Winter 2010 Department of Electrical and Computer Engineering University of Michigan - Dearborn Advisors: Professor Miller Professor Natarajan

  2. Project Description • Laser Tag System • Consists of a Laser Gun, Vest and Server. • Score is automatically kept on a game server that is wirelessly updated. • The vest/gun will be battery powered. • Two vests and guns will be designed, allowing for two players. The system will be expandable up to 4 teams of 16 players.

  3. Design Requirements • IR transmit and receive • Minimum range of 100ft • Wireless game updates • Distance over 100ft • Battery powered for up to 5 hours. • Minimum of 4 different teams • Vibration and sound feedback.

  4. Responsibilities • Chris • IR transmission • Game feedback • Greg • Wireless Server and Communication • Computer Interface • Neil • Vest/Server integration • IR Optics • Batteries

  5. Gun and Vest design • Transmit and receive an infrared signal between vests • Communicate with game server • Display one of 4 team colors • Display game status • Provide game feedback • Monitor battery voltage • Decided to use a dsPIC30F3011 processor • Programmed using MikroC for dsPic

  6. Infrared Wireless • Transmit unique player ID • 64 possible players • Differentiate between sensors for scoring • Uses manchester encoding with parity bit • Dedicated processor for • Receiving • Error checking • Transmit valid data to core processor • Vishay TSAL 6100 high power IR LED • TSOP 4830 IR receiver/demodulator

  7. Game Status and Feedback • 2x16 LCD • Game time remaining • Player Name • Tags • LEDs • Red, Green, Blue, and Yellow indicate team • White indicates tagged • Vibration motor • Physical response to being tagged • Sound • Audible responses for start game, end game, shots and tags

  8. Server Communication • Communicate via Xbee wireless link • Receive commands from game server • Game configuration • Start/ End game • Transmits in-game data • Tags -- location and opposing player • Eliminated • Battery status

  9. Full System Block Diagram Team Color LEDs I2C Port Expanders 2x16 LCD Hit LEDs PIC16F690 dsPIC30F3011 IR Sensors UART 1 UART 2 Xbee Wireless UART 1 PIC16F690 Sound Playback Vibration Motor IR Modulation IR LED

  10. Wireless and Vest Integration • Integrating 3.3V 5V signal leveling • SN7404 Inverting HEX buffers • Optics considerations • Batteries

  11. + 5 V From Xbee To PIC + 5 V + 3.3 V + 3.3 V From PIC To Xbee SN7404 + 5 V + 3.3 V Wireless and Vest Integration SN7404

  12. Infrared Optics • Two main ways to focus IR

  13. Passed IR Absorbed IR Original Half-Angle of LED Transmitted Angle IR LED Barrel Infrared Optics • Decided on Angle Limiting Barrel • Cheaper, interested more in Indoor use • More customizable • Smaller and more compact to design around • How it works

  14. θ 11.875 in. 12 in. 0.25 in. 24 in. X in. 1200 in. Infrared Optics • Design of barrel length • Design for 2ft spread at 100ft • Barrel Length = X in. , Barrel ID = 0.25 in. • Θ = tan-1(11.875/1200) = 0.567° • X = 0.125/(tan(0.567°)) = 12.63 in.

  15. Battery Considerations

  16. Final Battery • Decide on using NiMH • Better Energy Density • No Memory Effect • Environmentally friendly • Final Battery Pack Specs • System drawsXmA max currently • Need pack with minimum 5*X mAh rating for 5+ hrs of operation. • XmAh common battery pack type • 5-6cells per pack since need 5V or more to power • Weigh approximately 0.3 pounds

  17. Zigbee Wireless The Zigbee (802.15.4) protocol. • Low Power • UART Xbee Module • 3.3v power supply. • 250kbs RF data rate. • 50ma current requirement.

  18. Wireless Configuration • Latest firmware Version 10CE. • Coordinator – End Device network. • Configuration using X-CTU software. • Max range up to 300ft.

  19. Game Server Software Design • Visual Express Studio IDE. • Microsoft .Net 2.0 Framework to access COM Ports. • Serial access and UI were designed using C# language Visual C# Studio • Able to create User Interface • Easy access to COM ports

  20. Software Design Server Program • Multi-Threaded application. • Adjustable Baud rate, hand shaking serial port options. • Efficient score keeping. • Player options: Lives, Game Time, Shots Per Second, etc. • Easy-To-Use buttons, drop down boxes.

  21. Test Results • IR transmission was achieved in florescent lighting at a distance over 100 feet. • Xbee wireless transmission at 100 feet, full signal strength. Error check and auto resend. • Game Server receives game data, keeps score. • Implemented feedback features in actual laser tag gun.

  22. Conclusion Requirements Met • IR transmission/reception • Xbee Wireless transmission. • Game Server score keeping. • Successful framework. • Practiced design and implementation process. Future Work • Continued development, debugging. • Additional software features.

  23. Acknowledgements Advisors • Professor Miller. • Professor Natarajan. Additional thanks • The UMD electronics shop.

  24. Questions?

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