Michael Bova- Project LeadKevin Alderfer- Lead Engineer

Ryan Selig- Hardware Engineer

P13015-Navigation Aid for Visually-

Impaired

eZ430-RF2500

Why choose new design?

Benefits

Easier integration of transceiver into design

Controllable output power/read range for each tag/node

Lower power consumptionOn-board antennasFuture improvements: Can transmit

more data than just an ID

New Challenges

Redesigning the PCBUpdating software to utilize eZ430-

RF2500Staying under budgetCreating battery packs

Software

UML Functional Diagram (for each system below):

Main MSP430ReceiverTransmitter

Navigation Functional Diagram

Map Data Structures

h

Magnetometer Function Diagram

Access Point

End Device

Programmable Output Power

Output Power (dBm)

Read Range (m) Operating Voltage (V)

0 34 3.2

-20 10 2.7

-26 3-4 2.5

-28 1.5-3 2.5

-30 0.5-1 2.5

Hardware

Existing Design (block diagram)Changes neededProposed new design (block diagram)Proposed schematic/PCB for eZ430-

RF2500 interfaceRange limiting/funneling

Changes Made / Considered

Removed RFID H10223 connector

Removed LT1930 switching regulatorIncrease in Voltage no longer necessary due to

RFID removal

Consider adding Germanium diode between Li-Ion battery and Access Point for miniscule Voltage decrease (~0.2V)

Demos

eZ430-RF2500 network with different output powers

Input/Output (Keypad/Motors)

Task Management If design is done, order PCB by end of Finals week and eZ430s(Fall quarter). Update map file (Week 1) Purchase supplies for battery packs (Week 1) Update transmitting data (from temperatures to IDs) (Week 2) Test PCB from fab (Week 2) Assemble battery packs (Week 3) Replace reader code with eZ430 code (Week 4) Program each individual end device (Week 4) Test communication between nodes and receiver after integration (Week 5) Fix magnetometer code (Week 6) Test/improve path following (Week 7) Test/improve path finding (time permitted) Full system testing (Week 8) Write technical paper (Week 9) Create final product poster board (Week 10) Demo (Week 10)

Bill of Materials

Item Quantity Cost

eZ430-RF2500t 8 $160

eZ430-RF2500t 2 Borrowed

AAA batteries 20 $7.97

PCB Prototype 3 ($5/in^2)

AAA Battery Holder 10 $15.00 Battery/Spy-Bi-Wire connector 10 ?

Keypad 1 Inhereted

Magnetometer 1 Inhereted

Motors 4 Inhereted

Lithium Ion Battery 1 Inhereted

MSP430 Dev Kit 1 Borrowed

Sleeve 1 Inhereted

Plastic Housing 1 Inhereted

Major Risks

Not receiving PCB on scheduleFailing to meet customer

demands/deadlines due to reduced team size

Staying under budgetGauging workload incorrectly

Questions? Comments? Concerns?

Thank you for your feedback!