Track TimerFinial Semester PresentationSenior Design IINovember 29, 2011

Team Members

John RoseElectrical EngineeringVDIPPower System

Jonathan MoorheadComputer EngineeringEnclosureKeypad Interface 

Michael NguyenElectrical EngineeringTiming AccuracyVDIP

Chad PumphreyComputer EngineeringVDIPLCD Interface

Advisor

Dr. FollettAssistant Professor

OverviewBackground Problem Solution Constraints

◦Technical ◦Practical

System Testing Enclosure Production Questions/Comments

Background• Starkville High School has previously had to borrow timing systems for their races.

• Even today, they do not have a timing system for practical and competitive usage.

•Dr. Follett has experience with timing devices.

Problem• Timing Systems cost over $500.

• The thermal printer and the recurring cost of thermal paper.

• High School’s Physical Education program cannot afford this type of equipment.

Solution• To develop a cost effective timing system for high school and other teams with limited budgets.

• Replace Thermal printer with removable non-volatile media.

Hardware Block DiagramPlunger Inputs

Keypad

Display

Microcontroller

Storage

Power Supply

External Timer

Technical ConstraintsName DescriptionTiming Accuracy Timer must have an accuracy of 0.01 seconds

after 10 minutes of continuous running.

Battery life Batteries must operate for at least 12 hours.

Display Characteristics Display must be visible in mild outdoor conditions.

Push Button Push Buttons must be a single momentary switch, and their cords must be at least 12 feet in length or more.

Data Storage Memory must store at least 8,000 times.

Practical ConstraintsType Name Description

Economic Cost Total prototyping price must be under $400.00.

Environmental Operating Conditions The Track Timer must be weather resistant.

The Competition, Sprint8 price $969.00 [1].

The Track Timer has taken less than $400.00 to prototype.

Economic

Environmental Intended for outdoor usage.

Must be Weather Resistant.

System TestingLab Test

Accuracy Test Battery Life USB drive malfunction check

Field Test Track & Cross-Country Time-Position Matchup on Computer Report Durability Test LCD Visibility

Synchronous, Start

1 32

Lab Test- Accuracy Test

Lab Test - Battery Life

0.0 0.8 1.7 2.5 3.3 4.2 5.0 5.8 6.7 7.5 8.3 9.2 10.0 10.8 11.7 12.5 13.33.804.004.204.404.604.805.005.205.405.605.806.006.206.406.60

Battery Test

Without PMOSWith PMOS

Hours into test (hours)

Batt

ery

Volta

ge (

V)

Field Test - EventsSeptember 29, 2011 – Initial Field

Testing

October 22, 2011 - Starkville High School Hosts a Cross-Country Meet.

October 29, 2011 - Run for Education

Field TestStarkville Cross-Country Meet - October 22, 2011

Field TestRun For Education - October 29, 2011

System Testing Achieved Technical Constraint

Accuracy Battery LifeDisplay Characteristics

Achieved Practical ConstraintDurabilityEnvironmental

EnclosureModified a Pre-Made Enclosure

Laser Printer ◦Model A◦Model B

3-D Printer

Enclosure

Enclosure

Enclosure

Enclosure

Enclosure

Enclosure

Packaging All Inclusive

◦ TrackTimer Device◦ 8 RJ11 Plungers◦ 2 Mini-USB drives (4GB/each)◦ 4 AA Batteries◦ User Manual

Software w/ Barcode Scanner◦ Meet Manager

Bill of Materials[2]

Reference[1] Stopwatch Central.”Sprint Timing Systems” Sprint 8 Track

Package. 2011. http://www.stopwatchcentral.com/sprint/sprint.htm[2] www.Digi-key.com

Questions ?? ??