Group 9: Chill Geordi: RFID based location sensing

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Group 9 ChillGeordi RFID based location sensing

• Brian Loo (bloo)
• Geeta Shroff (gshroff)
• Zane Starr (zcs)

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Product Overview

• Indoor navigation system
• When GPS not available
• Mapping application on desktop
• Map database loaded stored on device
• RFID tagged path read by device
• Communicated to user via text to speech software
  on device

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Architecture

• 1) Admin to create map and layout tags
• 2) Speech to text / touchpad
• 3) RS322 / Wi-fi
• 4) RFID GEN 2

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State Diagram

• Admin creates map
• User inputs request for a location
• Device determines location
• Device fetches map and plans path accordingly to
  tags being read.
• User follows instructions from device

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State Diagram (PDA, Map GUI)
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State Diagram (RFID)
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Use cases

• Location assisted shopping
• Visually impaired location sensing
• Shortest path for couriers
• Directed tours
• One user per device

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Use Error scenario

• Low Battery
• RFID tag not found in database
• Unable to read RFID
• Unable to understand users voice command
• Unable to connect with DB server
• Unable to plan path

• Device turns off
• Ignore tag until next tag is found
• Move reader closer to RFID
• Inform user, revert to using touch screen
• Try 3 times, then revert to using local version
  of DB
• Inform user, ask for another destination

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Fundamental Risks

• SOFTWARE
• Inaccurate route planning
• Unwanted (impossible) paths in graph generation
• Device Driver handling capacity
• Multiple tags may collide

• HARDWARE
• RFID sensor
• Identifying a sensor to integrate into project
• Maintenance Infrastructure
• Price of RFID sensors tags
• RFID's falling off walls
• Latency
• Slow reading of RFID tags

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Ancillary Risks

• SOFTWARE
• Software response time
• path planning, voice output/input
• Voice to text/ text to voice implementation
• Revert to touchscreen

• HARDWARE
• RFID sensor
• Unable to get usable range
• Antennae
• Size of usable antennae
• Portability
• Size of device
• Power of Sensors

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Mitigations

• Inaccurate route planning
• Multiple tags colliding
• Software latency (path planning)
• Environmental( Signal attenuation)
• Price of RFID sensors tags
• Portability (Power for sensors)

• Next hop path generation
• Not a problem for GEN 2 tags
• Astar algorithm (pruning)
• Insulated backing- aware of surrounding materials
• Passive tags are cheap
• Depends on sensor

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END