Aps innovation
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APS Innovation. Fall 2007 Proposal. Team Breakdown:. Paul Brennan Sean Daugherty Adam Hughes Advisors: Dr. Vemuru, Dr. Khorbotly. Overview. Problem Definition Constraints Research and Information Gathered Design Alternative Design Project Timeline Estimated Budget Conclusion.

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Aps innovation

APS Innovation

Fall 2007 Proposal


Team breakdown

Team Breakdown:

  • Paul Brennan

  • Sean Daugherty

  • Adam Hughes

  • Advisors: Dr. Vemuru, Dr. Khorbotly


Overview

Overview

  • Problem Definition

  • Constraints

  • Research and Information Gathered

  • Design

  • Alternative Design

  • Project Timeline

  • Estimated Budget

  • Conclusion


Problem identification

Problem Identification

  • Submitted by American Electric Power (AEP)

  • Wireless Personnel Tracker/Communication System

    • Network controlled from central location

      • Monitors end device locations

      • Transmit text based messages to devices

      • Receive messages from devices

      • Responds to “panic” signal

    • RF Transceivers

      • Networked to overcome environmental limitations

      • Relays data between control and devices


Problem identification1

Problem Identification

  • Wireless Personnel Tracker/Communication System

    • End Device

      • Transmits its location in network

      • Receives text based messages from control

      • Transmits reply messages

      • Visual text output

      • Text input


Constraints

Constraints

  • Economics

    • Primary cost tied to engineering hours

      • $30 dollars per hour engineering cost

    • Efficient network coverage

      • Enough relays to provide strong signal throughout entire complex without needless redundancy

    • Consider final manufacturing costs

      • Concept worthless if its not marketable


Constraints1

Constraints

  • Environment

    • Ecological

      • Low power consumption

        • Reduces battery waste

      • Robust parts

        • Reduce waste from broken components

      • Radiation

        • Minimize radiation from wireless signals for employee health

    • Operational

      • Electromagnetic noise from AEP generators


Constraints2

Constraints

  • Sustainability

    • Durability

      • End devices are likely to be dropped and must be capable of absorbing impact

    • Network Maintenance

      • Mesh networks designed to work around node failures, but an administrator will be needed


Constraints3

Constraints

  • Manufacturing

    • Limited consideration, design is proof of concept

  • Ethics

    • Privacy

      • Employees carrying devices will be constantly monitored

  • Health and Safety

    • Radiation

      • Health Concerns

      • Interference with other critical devices


Constraints4

Constraints

  • Social

    • No practical social constraints

  • Political

    • Operates within public technology frequency

      • No FCC regulations to consider


Research and information

Research and Information

  • Zigbee

    • Well defined protocols

      • Ensures cross platform interoperability

    • Mesh Networking

      • AODV routing dynamically maintains paths

    • Low power

      • Years of operation on a pack of AA batteries

    • Range

      • Max range of over 60 ft


Researched information

Researched Information

  • Bluetooth

    • Low power

      • 25 to 37 mA current consumption

    • Pico Net

      • Allows for interaction among all networked devices

      • Limit to 10 devices per pico net

      • No cross network communication

    • Limited Range

      • Max range of approximately 30 ft


Research and information1

Research and Information

  • WiFi

    • Impressive Range

      • Residential range of 125 to 200 ft

      • Outdoor range of between 750 to 1000ft

    • High Transmission Rate

      • 11 Mbps or 54 Mbps

    • High Power

      • Standby current consumption of 15 mA

      • Max current consumption of 297 mA


Decision on technology

Decision on Technology


Design

Design


Design1

Design

  • End devices

    • Power source

      • Single pack of AA batteries

    • Display

      • Low power segmented display screen

    • Input

      • Full alpha-numeric keypad

      • Serial communication capable


Design2

Design

  • End devices

    • Microcontroller

      • TI CC2431 F64

        • 12 bit ADC

        • 64 Kb programmable flash memory

        • Serial communications port

        • Zigbee compliant RF transceiver

        • Locater system block

          • Supports tracker implementation through hardware


Design3

Design

  • RF transceiver

    • TI CC2431 ZDK model

    • Zigbee compliant

    • Supports mesh transmission

  • Control Center

    • GUI Application

      • Application will run at top layer of the network from a PC

      • Interfaced to the microcontroller

      • Interface for generating and reading messages

      • Checks flag bit of each packet for indication of panic button


Alternate design option

Alternate Design Option

  • Cheaper microcontroller

    • $2.53 cheaper average per unit price from TI

  • Cheaper development kit

    • Approximately $500 dollars cheaper

  • TI CC2430 F32

    • Half the flash memory

    • Locator system block not included on chip


Alternate design option1

Alternate Design Option

  • TI CC2430 F32 continued

    • Limited programmable flash increases the cost of memory

    • Missing system block requires extra programming effort to gain similar functionality

      • Increases the value of memory further

      • Money saved on parts may be overwhelmed by the cost in extra engineering hours


Design decision matrix

Design Decision Matrix


Estimated budget

Estimated Budget

  • Engineering hours account for nearly the entire cost of the project

    • 25 Summer research hours

    • 250 estimated implementation/testing hours

  • Parts, materials, and development kits make up a small portion of the overall cost

    • Motivating factor in the decision to reduce hours and take advantage of pre-existing technology with the CC2431 F64


Estimated budget1

Estimated Budget

  • Engineering Hours


Estimated budget2

Estimated Budget

  • Parts and materials


Project timeline

Project Timeline


Conclusion

Conclusion

  • Deliverables

    • Central control

      • Monitors end device locations

      • Transmit text based messages to devices

      • Receive messages from devices

      • Responds to “panic” signal

    • End devices

      • Transmits its location in network

      • Receives text based messages from control

      • Transmits reply messages

      • Generates panic signal


Conclusion1

Conclusion

  • Estimated cost

    • $22,750

  • Delivery Date

    • Proof of concept on March 14, 2008


Questions

Questions

  • Thank you for your time and feedback


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