Team 2 iDOCENT: Phase 2 Kirk Guotana Management Vadim Kim Document Adam Partlo Webmaster Shreyas Thiagarajasubramanian Presentation

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 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

Objectives Ten foot accuracy User friendly Audio feedback Minimal infrastructure

System Setup

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.

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 ItemQuantityUnit CostPrice Samsung Focus10.00 NetduinoPlus Electret Microphones WinHost Web Hosting2 months 4.95 /mo 9.90 Total$269.50

Questions?