1. Team 2 iDOCENT: Phase 2 Kirk Guotana Management guotanak@msu.edu Vadim Kim Document kimvadim@msu.edu Adam Partlo Webmaster partload@msu.edu Shreyas Thiagarajasubramanian Presentation thiagar3@msu.edu

2. Introduction iDOCENT – (indoor Digital Orientation Communication and Navigation Technology) A system to solve the problem of indoor guided navigation Targets visually impaired users – Working with MSU RCPD – Sponsored by Marathon

3. Background iDOCENT Phase 1 – Used Wi-Fi triangulation Phase 2 implements – Audio signal – Microphone modules Advantages of Phase 2 – Smartphone connection to internet – Not dependent on Wi-Fi

4. Objectives Ten foot accuracy User friendly Audio feedback Minimal infrastructure

5. System Setup

6. System Protocol 1.The smartphone contacts the server. 2.Server sends online confirmation. 3.Smartphone emits audio signal. 4.Receiving mics relay a message to the server. 5.Server analyzes the data, sends the user his position.

7. How does it calculate position? The server uses the first two timestamps for calculations. – If two are not given, only one is considered. – Position of microphones is known – Using difference in timestamps and the speed of sound, position of the user relative to each mic can be calculated.

8. System Design Minimizes transmission delay – No timestamp is collected from the cellphone – Microphones are connected through Ethernet Timestamps will be on server side – Ensures clock synchronization Process repeats to guide the user accurately

9. System Components Smartphone platform: – Samsung Focus – Windows Phone 7, C# – Easy to program Server – Asp.NET (C#) – Online webhosting

10. System Components Microcontroller – NetduinoPlus – Ethernet enabled – Digital I/O features – DSP capabilities – Very easy to program (C#)

11. Things to consider Frequency Interference Hearing Ranges (Infants/Animals) Multiple Users Server Crash Lack of Signal Range

12. Budget ItemQuantityUnit CostPrice Samsung Focus10.00 NetduinoPlus459.95239.80 Electret Microphones44.9519.80 WinHost Web Hosting2 months 4.95 /mo 9.90 Total$269.50

13. Questions?