In and Out Line Monitoring System for VolleyballKelley White

Advisor: Professor Buma

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

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

Block Diagram

Input from sensor microcontroller Indicator (LED)

Design: Sensors

9 force sensitive resistors (FSR’s)

Connected to microprocessor with thin wire

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

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

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

Questions?

Appendix

Budget:

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

FSR’s

1.75x1.5” $7.95

.5” diameter $6.95

.16” diameter $5.95

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