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In and Out Line Monitoring System for VolleyballKelley White
Advisor: Professor Buma
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What problem will this project solve? Goals?: A line judge determines if a ball lands in or outside the court There is a need to ensure good calls and a fair game for
players and coaches Develop a system that can determine if a ball lands on the
line
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Specifications: The prototype will be a 6 foot portion of the end line Battery powered and rechargeable (able to last a 10 hour
tournament day) Green light indicating ball contact Simple installation with overlying tape over existing line
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Block Diagram
Input from sensor microcontroller Indicator (LED)
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Design: Sensors
9 force sensitive resistors (FSR’s)
Connected to microprocessor with thin wire
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Design: Microprocessor
• Arduino- receives voltage signal from one or multiple of the FSR’s
• Output LED light at Arduino for ball contact and no light for foot contact
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Testing
Initial testing with the force plate in Butterfield
Testing with FSR’s in electrical engineering labs
Final testing on court with Union College Volleyball team
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Project Schedule:
Fall term:- Testing with FSR’s and adjust design if necessary- Finalize and order all parts- Detailed design description- Update web page- Final design report
Winter Term:- Algorithm development - Continued development with further testing- Final project complete with desired testing outcomes- Final project report
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Questions?
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Appendix
Budget:
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Thickness:
Basic scotch tape: 0.058 mm Wires: 0.2546 mm FSR’s: 0.40 mm
Max total thickness: 0.40+0.058= 0.458 mm
*will be negligible to players
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FSR’s
1.75x1.5” $7.95
.5” diameter $6.95
.16” diameter $5.95
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Arduino MEGA 2560:1. Pins: Need at least 11 input pins (9 with room)
√ there are 16 input pins
2. Memory rate: Unneeded. Processing real time data to make the output decision. Not storing any outputs/inputs.
√ 256KB
3. Sampling rate: 10 samples a second worked well for differentiating force, but 50 samples a second would ensure accuracy
√ 16MHz
4. Battery life will need to be chosen after testing with the FSR’s and computing the maximum power dissipation in the lab
Analog/digital MUX - 9 input sensors for only 6 feet & need a way to
look at all sensors if the project is expanded to the whole perimeter