ECE 290 Wireless Sensor Network WSN

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ECE 290Wireless Sensor Network (WSN)

• Huy Bui (EE)
• Sean McLaughlin (CMPE)
• Joshua Pyne (EE)
• Advisor Prof. John Chandy

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Presentation Outline

• Overview of previous project
• Motivation
• Requirement
• Specifications
• Design
• Design parts Processor, sensor types, XBee
  board, PDA
• Power
• Timeline
• Budget
• Issues

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Overview of previous project

• The individual node will be mobile.
• Sensors are able to collect and transmit audio
  and video data with different modes.
• The network should be self-reconfigurable.
• Range 30 m
• Zigbee 250 kbps
• Image compression JPEG
• Non-mobile base station

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Motivation

• Existing sensor network lack range
• Static base station limits use
• Portable base station allows for greater
  flexibility.

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Requirements

• Portable transceiver with ability of controlling
  and monitoring individual nodes
• Low power consumption
• Easy to use
• Good visibility

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Specifications

• Portability 5H x 8W x 1D inches
• Battery Life 5 hours
• XBee RF module
• Adjustable brightness
• User interface Easy to operate
• Functionality Controlling display options,
  turning on/off the nodes

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Design
Block diagram for a portable base station
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Methods

• Method 1 Custom design
• Pros
• More flexibility in screen choice
• More freedom in PCB design
• Cons
• More design work
• No operating system

• Method 2 PDA
• Pros
• Less design work
• Operating system
• Cons
• Less design choice
• Less flexibility

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Multiple Sensor types

• Generic protocol which can be used for multiple
  sensor types
• Flexible, able to be adapted to future sensors
• Examples temperature or pressure sensors
• Sensors with less power consumption can be given
  more transmission power to increase range

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XBee Board

• Typical range 30 m indoor, 100 m outdoor
• Transmit Power Output 1 mW (0 dBm)
• Power-down Current lt 10 µA
• Operating Frequency 2.4 GHz
• RF Data Rate 250kbps

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Processor

• Multiplex video signals from multiple wireless
  sensors
• Provide intuitive user interface
• Interface with LCD hardware (TTL, LVDS)
• Glue logic between XBee, video decoder, and LCD

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Power

• Major power-consuming components
• LCD Backlight
• XBee
• Decoder(s)
• Processor

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Power

• Will use a number of lithium ion battery cells
• More power per unit weight
• No memory problems

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Timeline
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Budget

• Method 1
• LCD - 250
• Backlighting and optics - 100
• Battery - 150
• Power regulation - 20
• Housing - 50
• Speaker, D/A, and amplifier - 50
• PCB - 50
• Buttons, touch screen - 50
• Decoder - 25
• XBee transceiver - 50
• Logic (uProc, ARM, FPGA, etc) - 50
• TOTAL 855

• Method 2
• PDA - 700
• XBee transceiver - 40
• Glue logic - 100
• TOTAL 840

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Issues

• Components or pre-built device (PDA etc) ?
• What type of LCD should be used?
• How can the visibility of the LCD be improved?
• How should the video be decoded? What decoding
  chips readily available?
• Should a touch screen be used, or can the desired
  control features be better implemented with other
  controls?
• How should the user interface be designed?

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