Track Timer Final Semester Presentation Senior Design I April 19, 2011

Team Members Jonathan Moorhead Computer Engineering Keypad Interface Bar Code Scanner Chad Pumphrey Computer Engineering System Interface Algorithm Design Website Michael Nguyen Electrical Engineering Timing Accuracy SPI FIFO John Rose Electrical Engineering SPI Comm. Power System PCB

Advisor Dr. Follett Assistant Professor

Overview Introduction Problem Solution Constraints  Technical  Practical Hardware Block Diagram Subsystem Test System Test Remaining Tasks and Timeline Questions

Introduction A timing system is a device that helps cross country and track judges maintain race time and record runners finish time. Often consists of a timing device with an LCD and up to eight plungers. Typically has a compatible output with competitive devices making swapping to another timer easy and eliminating the need to buy new software.

Problem Timing Systems cost over $500. Starkville High School borrows timing systems from neighboring schools. High School’s Physical Education program cannot afford this type of equipment. The thermal printer and the recurring cost of thermal paper.

Solution Develop a cost effective timing system for high schools and other teams with limited budgets. Replace thermal printer with removable non-volatile media.

Technical Constraints NameDescription Timing Accuracy Timer must have an accuracy of 0.01 seconds after 10 minutes of continuous running. Battery lifeBatteries 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. Data StorageMemory must store at least 8,000 times.

Practical Constraints TypeNameDescription EconomicCost Total prototyping price must be under $ EnvironmentalOperating ConditionsThe Track Timer must be weather resistant.

The Competition, Sprint8 price $ [1]. The Track Timer will take no more than $ to prototype. Economic

Environmental Intended for outdoor usage. Must be Weather Resistant.

Hardware Block Diagram Plunger Inputs Keypad Display Microcontroller Storage Power Supply External Timer

Subsystem Test Timing Accuracy VDIP1 ◦ SPI Communication ◦ Data Storage Keypad Plunger Character Display

Timing Accuracy Synchronous, StartTrack Timer 10 min mark 10 Minutes Range

Timing Accuracy 10 Minutes Toggle

VDIP1-A SPI Communication

VDIP1-B SPI - Communication

VDIP1 Data Storage

Plunger Test Plunger Test Synchronous, Start 1 32

Plunger Test Plunger Test

Character Display Character Display

System Testing

Interface Algorithm Battery Life

Interface Algorithm Welcome Screen XC -Mode Begin Timing Press Plunger Ready? Track Options Track -Mode Store Time End Race

Battery Life

Picture of Prototype

Remaining Tasks Refine Prototype Scroll back feature Enclosure Perfect the Plunger Push Buttons Field Testing

Time Line AugustSeptemberOctoberNovemberDecember Final Debugging PCB & Enclosure Field Testing Technical Support

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

Questions