rit college of engineering multidisciplinary senior design p10054-monitoring device for human...
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RIT College of Engineering
Multidisciplinary Senior Design
P10054-Monitoring Device for Human Smoking Behavior
Final Product Review19 February 2010
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Team MembersProject Manager
Frank Forkl
Mechanical EngineerBrian Gilbane
Electrical EngineerDerek Ng
Systems EngineerRich Steen
Mechanical EngineerMichael Kraft P10054
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IntroductionObjective: Create device which measures natural human smoking
behavior
Major Requirements: Subjects will need to carry device for up to one month in
the field Subject will use device for every cigarette smoked
Device must be as unobtrusive as possible Data to capture:
Flow Rate through cigarette Total Lung Volume to measure Deep Inhalation Puff
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• A self-contained battery operated device that measures ambulatory smoking behavior with time and date tags assigned at cigarette insertion/removal.
• Onboard memory is used to store all measures for up to four weeks without requiring interaction with study staff.
http://www.plowshare.com/products/portable/index.html
Existing TechnologyCReSS Device by Plowshare Technologies
Major Problems:• Extremely obtrusive which does not allow for natural smoking behavior
• Unable to capture entire smoking event (Deep Inhalation Puff)
• Performs poorly at bottom of flow rate resolution (less than 17.5 mL/s)
• Does not output Flow Curves, just aggregate data
• Extremely expensive (~$2000)
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Chosen Concept
Remote Handheld Smoking Device
Deep Inhalation Puff Sensor Belt
Belt Clip Central Unit
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System Diagram
Arduino Microcontroller(Rich)
Ergonomic Handheld(Frank)
Flow Meter(Brian)
DIP Respiratory Belt
(Mike)
Signal Conditioning
(Derek)
Battery(Derek)
Control Interface
(Rich, Frank)
MicroSD Card Shield- Data
Storage(Rich)
0-5 VDC Signal Belt Output Voltage
0-5 VDC
Digital I/O
Clock Time, Signal Voltages
+12 VDC
Belt Clip5V DC Power
5V DC Power
5V DCPower
Post Collection Data Processing
(Rich, Mike, Brian)
CSV onMicroSD Card
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Flow Path Design Process
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Handheld DeviceErgonomic Foam Mock Ups
Finished Handheld Designs
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Deep Inhalation Puff (D.I.P.)
The deep inhalation puff is the breath of “clean” air after taking an initial draw on a cigarette. This “clean” air includes side stream smoke or commonly known as second hand smoke.
By capturing the deep inhalation puff, the device will provide more accurate data than the CReSS device on how a human smokes a cigarette during an entire smoking event.
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Which type of belt?SLP Inc. Inductive Bands• Closed loops of conductive
wire woven in an elastic band
• Flow of the current is limited by a change in magnetic flux
BioPac Strain Gauge Belt• Linear strain gauge attached
to an adjustable elastic band
• Strain from tension is converted to a voltage signal
The signal-to-noise ratio from the BioPac belt was of a notably higher fidelity before amplification.
http://www.biopac.com/ProductImages/tsd201.jpghttp://www.sleepsense.com/pages/product
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Arduino Microcontroller
Criteria for Selection• Cost• Digital and Analog Inputs• Digital Outputs• Flash Memory
Arduino Duemilanove• Most economical
Conclusions• Real Time Clock (RTC)• Storage• Auto-Reset
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Data Storage Serial interface
rather than parallel ~0.5 second per
write operation Unreliable
operation
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12Volt DC 1800mAH rechargeable lithium-ion battery
Disposable battery would Requires frequent replacement Process more complicated for
the customer. Two main factors
capacity of the battery cost.
Other factors: size weight amount of voltage supplied
Requires external jumper
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Signal Amplification
DIP belt signal was too weak to be read properly
INA128 Biomedical Amplifier is a higher fideltiy
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Belt Clip Case
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Pressure Sensor Correlation
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BioPac/Spirometer CorrelationTidal Volume vs. Time
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BioPac/Spirometer CorrelationFlow Rate vs. Time
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Simulated Smoking Behavior
1
2
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Simulated Smoking Behavior
Inaccuracies of either correlation
Experimental noise
Leaks in the pressure sensor system
Air taken in by the smoker but not going through the cigarette
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Features Deemed Beyond Project Scope
Feature Rationale Cigarette Detection (Infrared or other method) Time, Lack of EE Expertise, Deemed Bell/Whistle Wireless Communication Between Device Components
Not necessary, possibly not actually desirable (losing pieces), lack of EE/CE expertise
Wireless Communication for Data Transfer Time, Lack of EE/CE Expertise, Deemed Bell/Whistle
Internal Permanent Connection Between Board and Battery
Time, Lack of EE Expertise
E-cigarette Adapter Time, Deemed Bell/Whistle
Flow Path Optimization Time, Lack of CFD expertise, will begin this work
Cigarette Vent Hole Issue Very challenging problem, solution is being attempted but is not guaranteed
Onboard Zeroing Sensors Time, Deemed Bell/Whistle, not wholly necessary
Custom DIP Belt Design Time, Lack of Expertise/Understanding in a timely manner, Cost
Embedded Software Upgrades: Power Management, Data Processing, Automated Calibration
Time, Lack of CE Expertise, team will make software functional and as advanced as possible
Battery Life Improvements Lack of EE expertise. Incremental improvement, our design will be adequate but could be improved
Case Design Upgrades for Moldability Time. Necessary for ramp up, will get done if possible
Further Ergonomic Testing and Improvements Time: incremental improvement achieved through additional focus group
Adding Retractable Wire Mechanism to Device Difficulty locating vendor of appropriate pre-fabbed mechanism. Will likely need custom design or custom part from vendor.
Improved Durability Limited time to design case internal structure. Will meet minimum level but cannot guarantee beyond that
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Thank You
All pictures used under educational fair use