Core Team & Roles David Monahan- Project Manager (ME) Brian
Glod- Data Lead (CE) Assis Ngolo Communication Lead (CE) Jahanavi
Gauthaman- Sensor Technology Lead (EE) Cory Laudenslager- Sensor-
MCU Interface Lead (EE) James Stern- Sensor- Human Interface Lead
(ME) Motion Tracking Technology Evaluation2
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Assistive Devices Family Motion Tracking Technology
Evaluation3
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P10010 Mission Statement To research sensors and implementation
methods for portable motion tracking systems capable of measuring
patients' range of motion in their natural environments. The
primary ranges of motion of interest: Motion of a human limb, where
a limb is defined as a 3-bar linkage, for example: upper leg, lower
leg, and foot. Motion of a human's lower back, where lower back is
defined as the lumbar region, with 3 points of contact: sacrum,
L1-L2, L3-L5. Motion Tracking Technology Evaluation4
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Project Deliverables Design concepts ranked according to
customer needs for use by future MSD projects. Analysis of possible
solutions for: Sensors, MCUs, ICs, circuitry, communication
devices. Work with P10011 to research compatible enclosures for the
system. Testing methods/ fixtures to test future systems. Test
several prototype sensors and systems (MSDII) Motion Tracking
Technology Evaluation5
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Customer Needs 6
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Customer Needs (contd.) 7
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Customer Needs II P10011 Motion Tracking Technology Evaluation8
Need #CategoryImportanceDescription Body Part Addressed by Spec #
CNAP100111 Keep each group informed of progres: Each group should
understand what the other group is doing, and know how they plan to
continue their projectsBothE22 CNBP100111 Design for multiple
sensors: Need to know if there is a need to design around multiple
types of sensorsBothE22 CNCP100112 Location of sensors: Need a list
of appropriate placement of sensors on body to adhere to comfort
styles of each part of the body affectedBothE22 CNDP100111 Accuracy
of Sensors: Need to know what degree the enclosure can affect the
sensor reading and still allow the system to generate meaningful
dataBothE25 CNEP100111 Durability: Need to know how well the sensor
modules need to be protected by enclosures and how much impact the
enclosure must ablate to protect the sensorBoth? CNFP100112 Size:
Need a list of sizes of sensor units involved to design enclosures
they will fit inBothE3 CNGP100112 Weight: Need to know approximate
or worst case scenario weight to know the maximum weight enclosures
can add to systemBothE9, E12
System Overview Motion Tracking Technology Evaluation11 Human
Interface (P10011) Sensors Interface Circuitry Microcontrolle r
Unit Communication Interface Analog-to-Digital Conversion Active
Filtering Signal Amplification Storage Interface [
www.serverlab.net ] [ www.laptoping.com ]
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Motion Tracking Technology Evaluation12
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Sensor Feasibility Overview Motion Tracking Technology
Evaluation13 Spec Number Customer Need Design
SpecificationUnitsIdeal Value Flex Sensor Rank (1-10) LIS302DL
Digital Output Accelorometer Rank (1-10) Tilt Sensor IMU Board Rank
(1-10) DE-ACCM3D2 Accelorometer Rank (1-10) Atomic IMU - 6DoF Rank
(1-10) Razor IMU - 6DoF Rank (1-10) 1CN14AccuracyDegrees1 10%7 7 7
7 7 7 2CN16RangeDegrees18090618010180 101808 10 18010 3CN6Size of
Sensormm x mm x mm30x30x154.5x3x593X5X11025X20.4X2 1021 x 10x 810
47 x 37 x 25 4 17.5 x 15 x110 4CN13Degrees of FreedomAxis315392 639
6 10 6 7CN3Input VoltageV95V10Digital (2.1-3.6)105 3.5 to 15V
(onboard regulator) 2.4 to 3.6 (no onboard regulator)10 3.4-10 10
2.7-3.610 CN3Output VoltageV3-52.8-410Digital102.5
101.5-2.4103.3103.3 10 CN21Set-up TimeMinutes105 158 8 8 8 8
12CN7Weight of Sensorsg105g102 2 1.310 15 6 410 17CN7 Comfort of
Sensors on PersonSubjectiveHigh 8 10High 10High10 Low 6 High10
19CN28Patient SafetySubjective Patient is Safe Safe8 10
Safe10Safe10Safe10Safe 10 20 CostDollars 10 1255Medium ($35)8 125 5
89.956 RANK 93 104 96 100 86 101
How Position Sensors work (example) Motion Tracking Technology
Evaluation15
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DE-ACCM3D2 Buffered 2g Tri-axis Accelerometer 3 axis output in
the x, y, and z Sensitive (up to 720 mV/g) Low power, input
voltage, and low current draw Light weight and small Voltage
regulator Short protection Limitation: stand-alone accelerometer
Motion Tracking Technology Evaluation16
http://www.dimensionengineering.com/datasheets/DE-ACCM3D2.pdf
Slide 17
LIS302DL Smart Digital Output Piccolo Accelerometer 2.16 V to
3.6 V supply voltage
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Tilt Sensor IMU Board Gyro and Tilt sensor Low Voltage
Operation: 5V Regulated Highly Accurate/High Sensitivity Rated
Analog Output Self Test For Both Sensors Small and light weight
Cost: $125.00 Limitations: High cost; Only 2 axis Motion Tracking
Technology Evaluation18