Electrical and Computer Engineering Motion Analyzer for Physical Therapy (MAPT) SDP10 - Comprehensive Design Review Arjuna Baratham (CSE) - Sean Klaiber (EE) - James Rutter (EE) - Constantina Tyes (EE) Professor Soules Advisor, Senior Lecturer, ECE February 12 th, 2010

2 Electrical and Computer Engineering Outline I.Design Review II.Key Design Components III.Demonstration IV.Complete Design Overview V.Future + Timeline

3 Electrical and Computer Engineering Problem and Solution Reliable Quantitative Data in Physical Therapy (PT) can only be Collected with a One-on-One Patient/Therapist Interaction Create a simple, inexpensive, and portable device that can accurately measure physical therapy related motion

4 Electrical and Computer Engineering Block Diagram

5 Electrical and Computer Engineering Progress Since MDR Beagleboard platform: Wireless USB interface Processing sensor data in Python Audio feedback Shell scripts for files and memory

6 Electrical and Computer Engineering Outline I.Background II.Key Design Components III.Demonstration IV.Complete Design Overview V.Future + Timeline

7 Electrical and Computer Engineering Wearable Sensor Zigbee Transmitter 3.3V ADXL335 Accelerometer 4mm x 4mm x 1.45mm, 3.3V 9V Battery-Power Supply Voltage Regulator 3.3V

8 Electrical and Computer Engineering Mounting Wireless Sensor 2 XBee Transmitters 2 Accelerometers - ADXL335 Power Source – Coin Battery Rechargeable Lithium Coin Cell 200mAh Inexpensive

9 Electrical and Computer Engineering Processing and Display Counterpart XBee wireless receiver plugged into USB on BeagleBoard All pitch values plus timestamp logged into.txt file Gobetwino software listens to serial port for specific commands Logs all pitch values with timestamp in.txt file GNU Octave processes info in.txt file Plots Pitch vs. Time

10 Electrical and Computer Engineering Demonstration

11 Electrical and Computer Engineering Outline I.Background II.Key Design Components III.Demonstration IV.Complete Design Overview V.Timeline

12 Electrical and Computer Engineering Wireless Transceivers XBee Series 1 radios 1 mW transmit power 250 Kbps data rate Flexible pin arrangement Configuration 3 analog sample every 3ms (100 Hz) bps baud 30 byte packets Start Byte DataChecksumLength MSBLSB0x7EUp to 105 bytes 1 Byte XBee packet format:

13 Electrical and Computer Engineering Accelerometer Model

14 Electrical and Computer Engineering Outline I.Background II.Key Design Components III.Demonstration IV.Complete Design Overview V.Future + Timeline

15 Electrical and Computer Engineering Team Roles Sean GNU Octave, Gobetwino script, power research User/PT Interface James Accelerometer code, BeagleBoard research Accelerometer development, BeagleBoard processing Arjuna Wireless links, accelerometer research Both wireless sensors and integration with PSFD Constantina Mounting WS, power and accelerometer research SD card storage, Wireless sensor mounting and power

16 Electrical and Computer Engineering Finances Already purchased: Anticipated costs: Part #DescriptionQuantityUnit PriceTotal Price WRL-08664Xbee Radio222.95$45.90 v1.1Xbee Adapter Kit210.00$ Xbee USB Board129.95$29.95 SEN D Accelerometer124.95$24.95 EPS P6P5V Power Supply17.16$7.16 Total$ Part #DescriptionQuantityUnit PriceTotal Price WRL-08664Xbee Radio122.95$22.95 v1.1Xbee Adapter Kit110.00$10.00 SEN D Accelerometer124.95$24.95 Wireless Sensor PCB333.00$99.00 Total$156.90

17 Electrical and Computer Engineering Timeline

18 Electrical and Computer Engineering Questions?