Team 5: Good Vibrations

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Team 5 Good Vibrations
18549 Embedded Systems Design

• Bryce Aisaka
• Justin Beaver
• Tony Felice
• Skanda Mohan

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Team Members
Bryce Aisaka
Justin Beaver
Tony Felice
Skanda Mohan
baisaka_at_andrew.cmu.edu justinbeaver8_at_gmail.com
romman0012003_at_gmail.com skandam_at_andrew.cmu.edu
http//www.ece.cmu.edu/ece549/spring10/team5/inde
x.html
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Concept

• A silent, portable, comfortable,
  battery-operated, phone activated, vibrating
  pillow cover
• User sets time to wake up via phone UI, pillow
  vibrates at that time to wake user
• Competitive Advantages
• Portability Just need to carry your cell phone
  and our pillow cover
• Customizable Can use our pillow cover with the
  pillow of your choice

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Goals

• Silent Should not wake up anyone else
• Portable
• Battery Operated Does not need to be plugged in
  during usage
• Phone activated Can use the cell phone that you
  already own to activate the pillow vibration
• Customizable
• Fail-Safe Sound is emitted only if person does
  not wake up after set time limit
• Effective Needs to be able to wake someone up

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Architecture
Serial port Bluetooth module
Arduino Nano
Bluetooth enabled Android phone
Solarbotics VPM2 Vibrating Disk Motor
3x Triple As
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Components
Solarbotics VPM2 Vibrating Disk Motor
Arduino Nano Bluetooth module (BlueSmirf Gold)
Battery Holder AAAs
Bluetooth Enabled Smart-Phone (Motorola Droid)
User Interface
Padding Covers
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Experimentation Campaign

• Bluetooth Range
• Method Stand at a certain distance and measure
  the time it takes for the BT connection to be
  established and a byte to travel round trip
• Took 30 measurements at increments of 5 feet to
  ensure reproducible results
• Idle Power Consumption
• Method Leave all components of the system
  running in idle state, measure how long it takes
  for batteries to run out
• Continuous Power Consumption
• Method Leave the vibration motors continuously
  running, measure how long it takes for batteries
  to run out.

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Experimentation Campaign (cont.d)

• User Survey
• Method Ask 10 test users to use our product and
  answer a series of questions
• Questions address comfort of pillow, willingness
  to adopt our product, and pricing of a
  mass-produced version of our product

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Experimental Results

• Bluetooth range test results
• Idle Power Consumption 24 hours
• Continuous Power Consumption  gt65 minutes

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Experimental Results (cont.d)

• Number of users who said
• The pillow was comfortable while handling it
  9/10
• The pillow was comfortable while lying on it
  10/10
• They would wake up from the high vibration
  setting 9/10
• They would wake up from the medium vibration
  setting 8/10
• They would wake up from the low vibration
  setting 2/10
• They would prefer our product to how they
  currently wake up 6/10
• Of the people who said they prefer our product,
  the number of users who said
• They would be willing to charge the pillow as
  often as they charge their cell phone 4/6
• They would be willing to pay up to 20 for our
  product 6/6
• They would be willing to pay up to 30 for our
  product 2/6
• They would be willing to pay more than 30 for
  our product 1/6

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Insights from Measurements

• Battery life is sufficient, but daily recharging
  may be required
• Bluetooth range is long enough for typical
  bedroom use
• Our comfort and effectiveness requirements seem
  to have been met
• Users seem reluctant to break habits and switch
  to a newer, novel way to wake up
• The target price is 20

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Open Issues

• Longer battery life
• A 5V power solution for more powerful vibration
• Sensors on pillow cover
• Making the pillow cover washable

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Conclusions

• Some things we learned
• Arduino has much more computing power than we
  actually need, but is really convenient
• Bluetooth is surprisingly easy to use, once you
  find the proper UUID
• What we accomplished
• Building a finished product
• What we would do differently
• Order parts earlier