Team 2iDOCENT: Phase 2
Kirk GuotanaManagement
Vadim KimDocument
Adam PartloWebmaster
Shreyas ThiagarajasubramanianPresentation
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
BudgetItem Quantity Unit Cost Price
Samsung Focus 1 0.00 0.00NetduinoPlus 4 59.95 239.80Electret Microphones 4 4.95 19.80WinHost Web Hosting 2 months 4.95/mo 9.90
Total $269.50
Questions?