Track TimerMid-Semester PresentationSenior Design IFebruary 18, 2011

Team Members

Jonathan MoorheadComputer EngineeringPower SystemKeypad Interface

Chad PumphreyComputer EngineeringVDIPLCD Interface

Michael NguyenElectrical EngineeringTiming AccuracyVDIP

John RoseElectrical EngineeringLCD InterfacePower System

Advisor

Dr. FollettAssistant Professor

OverviewBackgroundProblemSolutionHardware Block DiagramConstraints

TechnicalPractical

Design ChoicesTimelineProgressQuestions/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 Diagram

Plunger Inputs

Keypad

Display

Microcontroller

Storage

Power Supply

External Timer

Technical ConstrainsName Description

Timing 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 Constraints

Type 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 will take no more than $400.00 to prototype.

Economic

Environmental Intended for outdoor usage.

Must be Weather Resistant.

Design ChoicesExternal TimerDisplay KeypadStorageMicrocontroller

External TimerOptions

Frequency Stability

Package Driving Power

Price

Component Chosen

9B-12.000MEEJ-B

±10ppm Through Hole 100 μW

$0.56[2]

7m-12.00MEEQ-T

±10ppm Surface Mounted No Leads

10 μW $1.69[3]

[2] [3]

StorageOptions Interface Power

Consumption(During Write)

Price Component Chosen

VDIP1(Two Needed)

FIFO, SPI, UART

200mW $49.00[4]

microSD Card Module(Two Needed)

SPI, I2C 60mW $49.00[5]

Thermal Printer w/ Interface Board

RS232C 12.5W $176.42[6]

[4]

[5] [6]

MicroprocessorOptions I/O

PinsPackage

Power Dissipation

Price Component Chosen

PIC24FJ128GA006

53 SOIC 500µW $5.36[7]

PIC24HJ32GP202(Two Needed)

42 DIP 198mW $8.88[8]

[7] [8]

KeypadOptions Layou

tPackage Weather

Resistance

Price Component Chosen

ACT-07-3008 4x4 2.7” x 3” IP42 $12.50[9]

88BB2 4x4 2.5” x 2.7” IP42 $23.44[10]

[9] [10]

LCD DisplayOptions Characte

r LayoutController(Interface)

Power Dissipation

Price Component Chosen

NHD-0212WH-AYGH-JT

12x2 ST7066(Parallel)

174mW $9.50[11]

NHD-0216BZ-FL-YBW

16x2 SPLC780D(Parallel)

608mW $10.00[12]

[11]

[12]

TimelineJanuary February March April

Research

Assemble Prototype

UI Application

PCB, Enclosure

Field Testing

ProgressOrdered all parts needed to

prototypeMounted a PIC24FJ128GA006 on

breakout boardLCD Interface

ProgressMatrix keypad

ProgressImplemented 8 Plunger Inputs

ProgressVDIP

ProgressOperating Software for deviceExternal Oscillator

Reference[1] Stopwatch Central. “Sprint Timing Systems” Sprint 8 Track Packa.ge 2011.http://www.stopwatchcentral.com/sprint/sprint.html

[2]Digi-Key.9B-12.000MEEJ-B.2011. http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=9B-12.000MEEJ-B

[3]Digi-Key.7M-12.000MEEQ-T.2011. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=887-1316-1-ND

[4]Dig-ikey.VDIPI.2011. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=768-1001-ND

[5]Sparkfun.SD_MMC Breakout.2011. http://www.sparkfun.com/products/9530

[6] Digi-Key.P2502. 2011. http://dkc3.digikey.com/PDF/US2011/P2502.pdf

[7]Digi-Key.PIC24FJ128GA006-I/PT.2011. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=PIC24FJ128GA006-I/PT-N

[8] Digi-Key. PIC24HJ32GP202-I/SP.2011. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=PIC24HJ32GP202-I/SP-ND

[9] All-electronic. ACT-07-3008.2011.http://www.allelectronics.com/make-a-store/item/KP-23/16-BUTTON-KEYPAD-4-X-4//1.html

[10]Digi-key.88BB2.2011. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=GH5017-ND

[11]Digi-key.NHD-0212WH-AYGH-JT.2011.http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=NHD-0212WH-AYGH-JT

[12]Digi-key.NHD-0216BZ-FL-YBW.2011.http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=NHD-0216BZ-FL-YBW

Questions