P10010: Motion Tracking Sensor
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Sensors

Table of Contents

Step 1. Clarify The Problem

System concept overview:

Skin surface interface (ME)- sensor(EE)- through multiple sensors (EE)- storage (USB Flash drive and/or an MCU) (CE)- transfer data to PC (via USB or Bluetooth or Wireless) (CE)- convert from voltage data to angles (EE and/or CE).

Areas of interest on the human body for the placement of these sensors, in this project, are:

1. Spine: Lumbar region: Sacrum-L1/L2-L3/L4/L5

2. Arm: Shoulder-Elbow-Wrist

3. Leg: Hip-Knee-Ankle

Customer requirements for sensors:

1: The device should obtain and measure the angles formed by a person's lower back and limbs with at least one or three degrees of freedom.

2: The accuracy of angles should ideally be +/-1degree.

3. A portable motion tracking system.

4. Sensor readings are not affected by external factors (skin, bumps, etc)

5. The sensor may not interfere with any electromagnetic devices, such as, pacemakers, implanted defibrillators, etc.

Hence, we explore, in-depth, those sensors which meet our initial requirements: measures angles with one or three (or more) degrees of freedom accurately, be light, and small. Further, we explore different technology options for these sensors. Some of the many possibilities we considered were accelerometers, gyroscopes, magnetometers, potientiomers (linear, rotary, etc.), and also any available digital options. We rule out magnetometers due to above mentioned requirement about electromagnetic interference.

Sensor Concept Selection Research


DE-ACCM3D2 Buffered +-2g Tri-axis Accelerometer (ASSIS-FEASIBILITY)

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Features

http://www.dimensionengineering.com/datasheets/DE-ACCM3D2.pdf

ADXR5614 Gyro and ADXL203 Tilt Sensor IMU Board (BRIAN-FEASIBILITY)

public/SENSORPICS/ADXR.jpg

Features

http://www.sparkfun.com/datasheets/Accelerometers/IMU_Combo_Board-v2.pdf

LIS302DL Smart Digital Output "Piccolo" Accelerometer (JANVI-FEASIBILITY)

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Features

http://www.st.com/stonline/products/literature/ds/12726.pdf

SEN-08606 Resistive Response Flex Sensor (JANVI-FEASIBILITY)

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Features

http://itp.nyu.edu/physcomp/sensors/Reports/Flex

Atomic IMU - 6 Degrees of Freedom (CORY-FEASIBILITY)

public/SENSORPICS/IMU.jpg

Features

http://www.sparkfun.com/commerce/product_info.php?products_id=9184

XSENS Mti Sensor (DELETE)

public/SENSORPICS/XSENS.jpg

Features

orientation tracking

cross-sensitivity

http://www.xsens.com/images/stories/products/PDF_Brochures/mti%20leaflet%2009.pdf

MMA7260Q Three Axis Low-g Micromachined Accelerometer(DELETE)

public/SENSORPICS/MMA.jpg

Features

http://www.sparkfun.com/datasheets/Accelerometers/MMA7260Q-Rev1.pdf

Step 4. Explore Systematically

public/SENSORPICS/SPREADSHEET.jpg

Generate Product Concepts

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