1. Group 9: Chill Geordi: RFID based location sensing Brian Loo (bloo) Geeta Shroff (gshroff) Zane Starr (zcs)

2. 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

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

4. 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

5. State Diagram (PDA, Map GUI)

6. State Diagram (RFID)

7. Use cases Location assisted shopping Visually impaired location sensing Shortest path for couriers Directed tours –One user per device

8. Use Error scenario Low Battery RFID tag not found in database Unable to read RFID Unable to understand user’s 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

9. 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

10. 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

11. 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

12. END