Transcript Propulsiometer Instrumented Wheelchair Wheel

Propulsiometer
Instrumented Wheelchair
Wheel
Prepared by:
Seri Mustaza (BME)
Siti Nor Wahida Fauzi (BME)
Ahmad Shahir Ismail (EECE)
Hafizul Anwar Raduan (CompE)
Advisor:
Dr. W Mark Richter (PhD, Director of Research and
Development, MAXmobility)
MAXmobility
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FitSki ergonomic adjustable water ski
Accessible wheelchair treadmill
Basically, working with ergonomic wheelchair:
 Propulsiometer instrumented wheelchair wheel
 Transfer friendly wheelchair
 Variable Compliance Hand-Rim Prototype (VCHP)
 Effective ways to propel the wheel
Background
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Repetitive movement of arm can cause
stress injuries.
Provide strategies to reduce the likelihood
of developing injuries.
Measured forces and moments on hand
Propulsiometer
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Located on tubular hoop that can be mounted on
different sizes of wheelchair’s wheel.
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To access the load applied by manual wheelchair user.
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Consist of DAQ, load cell, wireless transmitter, battery,
DC/DC converter, sensor.
Propulsiometer
Battery
Viasat MiniDAT™
Sensor
Load Cell
DC/DC Converter
Data Collected
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Angle vs. time
Moments
Force vs. time:
 Fx
 Fy
 Fz
Wheel angle
Force, Torque, &
Moments
Data collected from propulsiometer to the PC
In depth
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MiniDAT™
 16-bit resolution
 16 single ended or 8 differential analog inputs
 8 digital I/O lines
 IEEE 802.11 wireless LAN
 Uses 15V DC voltage
 7.9 x 4.2 x 1.42 inches (LWH)
 Weight = 1.5lb
 Cost = $4,625.00
Solutions
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12-Bits A/D converter
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Wireless transceiver (2.4-2.53 GHz)
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Power regulator
Specific Goals
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Size: 2 x 2 x 0.5 inches (LWH)
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Weight: ~0.25lb
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Cost: less than $500.00
V-Link
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One of the pre-packaged product
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Meets all the requirement
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Cost = $2,395.00
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Study purpose
Circuit Schematic of V-Link
Target Microcontroller
Specifications
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7 analog channels and 1 digital
channel
A/D with 12 bit resolution
1 quadrature encoder input
Wireless capability
Sampling rate of at least 10 kHz
Accepts voltage signal of -5/+5 volts
Power consumption ~5 watts
Small and compact
Guidelines
January
February
March
April
First half:
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start focusing on the
budget
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contact with desired
manufacturers
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meet Mark on regular
basis (once a week)
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study BASIC Stamp©
modules
First half:
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gather best possible
solutions for chips
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Wireless transceiver
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power supply and power
regulator
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meet Mark on regular
basis (once a week)
First half:
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make changes to
prototype if needed
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start build the DAQ
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build the
propulsiometer
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putting things
together on the
PCM board
(custom made)
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start working on the
interface
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meet with Mark (if
needed)
First half:
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preparing for the last
presentation with Prof
Paul King
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finalize our work
Second half:
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preparing for the
second presentation
with Prof Paul King
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study V-link and basic
chip technology (AD
chip, quadrature
encoder, and what else
that should be
embedded)
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understand requirement
of each step
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meet Mark on regular
basis (once a week)
Second half:

preparing for the third
presentation with Prof
Paul King
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Start purchasing
necessary chip
and compartment
to build the DAQ
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start constructing
the DAQ
prototype.
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test the prototype
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meet Mark on
regular basis (once
a week)
Second half:
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preparing for the fourth
presentation with Prof
Paul King
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test the propulsiometer
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continue on interface
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start on offset
Second half:
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continue on finalizing
our work
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prepare for the Senior
Design Day (poster)
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compile and present
design poster and final
results