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WaitLess Campus Bus Tracking Display

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WaitLess Bus Tracking Display. Matthew Brooks. Chris Chidi. Josh Mauldin. Daniel Nadeau ... What: A display showing GPS locations of Georgia Tech campus buses ... – PowerPoint PPT presentation

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Title: WaitLess Campus Bus Tracking Display


1
WaitLess Bus Tracking Display
Matthew Brooks Chris Chidi Josh Mauldin Daniel
Nadeau Georgia Institute of Technology ECE
4007 Senior Design Preliminary Design Review
March 12th, 2009
2
Project Overview
  • What A display showing GPS locations of Georgia
    Tech campus buses using LEDs arranged along a map
    placed at campus bus stops.
  • Why 96 of surveyed students are dissatisfied
    with current text based bus prediction systems
    which are limited to only a few bus stops.
  • Who Assists campus pedestrians in deciding
    whether to wait for the bus or just walk.
  • Cost Estimated prototype development cost of
    6700. Per unit cost production will be 600.

3
Design Objectives
  • Low Power
  • Solar panel with battery
  • Low power micro-processor
  • Internet Access
  • Wi-Fi module
  • Use existing GPS data available via NextBus.com
    (XML feed)?
  • Self-Sustaining/Easy to Deploy
  • No wires/low maintenance
  • No energy cost
  • Weather proof case
  • Low Cost
  • Per unit cost 600

4
System Functional Diagram
5
Power Source
  • Lead-Acid Battery, 12V, 7Ah
  • Solar Battery Maintainer, 12V, 5.5W
  • Provides 450mA During Daylight Hours
  • Texas Instruments Switching Voltage Regulator
    (12V?5V)?

6
System Functional Diagram
7
Wi-Fi Module
  • ConnectOne wireless module is used to connect to
    the NextBus.com server and receive GPS data.
  • Uses WEP security with GTWireless.
  • Information is obtained every 10 seconds by
    sending a specific URL to receive the GPS
    location of all buses on a particular route via
    XML.

8
GPS Data
  • Using a specific URL provided by NextBus.com,
    locations of buses on each route are saved every
    10 seconds.
  • URL provides XML data feed.

9
System Functional Diagram
10
Micro-processor
  • Arduino development board utilizes an Atmel
    ATMega168 micro-processor, 16MHz.
  • 16KB Program ROM, 1KB RAM
  • Large arrays are saved in ROM
  • Arduino provides I2C and serial libraries for use
    with the ATMega168.
  • Serial TX, RX, Ground
  • Used to communicate with the Wi-Fi module
  • I2C SCL, SDA, 5 V
  • Used to communicate with 7 LED drivers

11
System Functional Diagram
12
Lighting the LEDs
  • CAT Semi CAT9552
  • 16 channel I2C-bus LED drivers
  • 7 drivers are used to address 42 LEDs
  • Common Anode RGB LED
  • Any combination of Red, Green, or Blue color
  • 4000 mcd brightness
  • 20mA current draw

13
LED Locations on Map
14
Display/Board Design
  • Photoshop used to create map graphic and
    calculate the LEDs XY coordinates
  • KiCad used to create the schematic and the PCB
    layout
  • Google Maps used to determine the LEDs GPS
    locations

15
Project Schedule
16
Demonstration Plan
  • Daytime operation using solar charger
  • Video to show night time operation
  • Live demonstration of a minimum of two routes
    displayed

17
Current Status
  • Writing code for the Wi-Fi adapter
  • Debugging code to generate LED commands
  • PCB is complete
  • Case is complete

18
Questions?
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