Team 2 iDOCENT : Phase 2

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

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

Background • iDOCENTPhase 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

Objectives • Ten foot accuracy • User friendly • Audio feedback • Minimal infrastructure

System Setup

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

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.

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

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

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

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

Budget

Questions?

Team 2 iDOCENT : Phase 2