Track Timer Mid-Semester Presentation Senior Design I February 18, 2011

Team Members Jonathan Moorhead Computer Engineering Power System Keypad Interface Chad Pumphrey Computer Engineering VDIP LCD Interface Michael Nguyen Electrical Engineering Timing Accuracy VDIP John Rose Electrical Engineering LCD Interface Power System

Advisor Dr. Follett Assistant Professor

Overview Background Problem Solution Hardware Block Diagram Constraints  Technical  Practical Design Choices Timeline Progress 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 Diagram Plunger Inputs Keypad Display Microcontroller Storage Power Supply External Timer

Technical Constrains 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 or more. 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.

Design Choices External Timer Display Keypad Storage Microcontroller

External Timer OptionsFrequency Stability PackageDriving Power PriceComponent Chosen 9B ME EJ-B ±10ppmThrough Hole 100 μ W $0.56 [2] 7m MEEQ-T ±10ppmSurface Mounted No Leads 10 μ W $1.69 [3] [2] [3]

Storage OptionsInterfacePower Consumption (During Write) PriceComponent Chosen VDIP1 (Two Needed) FIFO, SPI, UART 200mW$49.00 [4] microSD Card Module (Two Needed) SPI, I 2 C60mW$49.00 [5] Thermal Printer w/ Interface Board RS232C12.5W$ [6] [4] [5] [6]

Microprocessor OptionsI/O Pins PackagePower Dissipation PriceComponent Chosen PIC24FJ128GA00653SOIC500µW$5.36 [7] PIC24HJ32GP202 (Two Needed) 42DIP198mW$8.88 [8] [7] [8]

Keypad OptionsLayoutPackageWeather Resistance PriceComponent Chosen ACT x42.7” x 3”IP42$12.50 [9] 88BB24x42.5” x 2.7”IP42$23.44 [10] [9] [10]

LCD Display OptionsCharacter Layout Controller (Interface) Power Dissipation PriceComponent Chosen NHD-0212WH- AYGH-JT 12x2ST7066 (Parallel) 174mW$9.50 [11] NHD-0216BZ- FL-YBW 16x2SPLC780D (Parallel) 608mW$10.00 [12] [11] [12]

Timeline JanuaryFebruaryMarchApril Research Assemble Prototype UI Application PCB, Enclosure Field Testing

Progress Ordered all parts needed to prototype Mounted a PIC24FJ128GA006 on breakout board LCD Interface

Progress Matrix keypad

Progress Implemented 8 Plunger Inputs

Progress VDIP

Progress Operating Software for device External Oscillator

Reference [1] Stopwatch Central. “Sprint Timing Systems” Sprint 8 Track Packa.ge [2]Digi-Key.9B MEEJ-B [3]Digi-Key.7M MEEQ-T [4]Dig-ikey.VDIPI [5]Sparkfun.SD_MMC Breakout [6] Digi-Key.P [7]Digi-Key.PIC24FJ128GA006-I/PT I/PT-Nhttp://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=PIC24FJ128GA006- I/PT-N [8] Digi-Key. PIC24HJ32GP202-I/SP I/SP-NDhttp://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=PIC24HJ32GP202- I/SP-ND [9] All-electronic. ACT [10]Digi-key.88BB [11]Digi-key.NHD-0212WH-AYGH-JT [12]Digi-key.NHD-0216BZ-FL-YBW

Questions