department of electrical and computer engineering team 7 “the beepachu” preliminary design...
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Department of Electrical and Computer Engineering
Team 7
“The BeepachU”
Preliminary Design Review
Department of Electrical and Computer Engineering
Team 7 Members
Eric WagnerEE
David ZeifmanCSE
Mark WagnerEE
Quanquan HanEE
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Problem Statement
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The Problem Millions of items are misplaced
every day (i.e. keys, wallets)
Lost items = Lost time
We need an easy, cheap solution to help find lost items
Where did my X
go?
Where did my X
go?
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Significance of the Problem Lost items can cause people to be late to work and
other events
Delays caused by lost items don’t just affect you!
If the average adult spends 15 minutes looking lost items everyday• 15 minutes x 365 days = 5,475 minutes• 5,475 minutes = 3.8 days/year• 3.8 days/year = 190 days over 50 years
200+ days lost over a lifetime
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Context: Effect on Individuals
Losing or having your valuables stolen leads to stress• Need to cancel credit cards,
change locks• Wastes time
Need to keep a close eye on things• Distracts from more
important tasks
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Context: Effect on Groups
Lost items can delay group meetings
Sometimes requires third party intervention i.e. Police or Banks Wastes everyone’s time and money
Fewer lost items Less stress Less stress Happier communities!
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Broader Impacts
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Broader Impacts: Moral Implications A product that helps locate items could be used to
locate people This raises privacy concerns Sometimes helping to find people isn’t a bad thing
Could be used as an anti-theft device An alarm mode could alert individuals when lost items go out
of range
If the product plays a sound to help users find an item, that sound could be customized for pranks i.e. fart sound played at embarrassing times
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Broader Impacts: Special Populations
Parents Could use product to help keep track of children
Care-Takers Could use product to keep track of Alzheimer patients who
may wandering off
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Design Considerations
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Requirement Analysis: Specifications
Helps people locate lost items Small enough not to be a burden Cheap Easy to operate Works over a wide operating range
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Requirements Analysis: Inputs and OutputsInputsLosable itemsButton Press
Outputs Feedback that helps
locate itemSoundLightDirection of lost item
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Possible Solutions
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Design Alternatives: Non-Technical Solution
Don’t Lose Item
Search All Possible Locations
If either of these solutions actually worked our problem statement would not have been valid
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Design Alternatives: RFID
We could use RFID chips as receivers and an RFID reader as a transmitter
Pros• RFID tags are extremely small and cheap• Passive RFID tags do not need battery
Cons• Short range (6m for passive, 30.5m for active/semi-passive tags)• RFID readers are large and expensive
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Design Alternatives: Wifi
We could use make a transmitter tag that connects to nearby Wifi and uploads its position to a hub
Pros• No dedicated receiver• could read lost item location from a computer/phone
Cons• Constantly searching for wifi signal/uploading data takes a lot of
power• What if lost item is outside wifi-range?
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Design Alternatives: Smartphone Tracking
We could utilize a smartphone’s Bluetooth compatibility to communicate with a Bluetooth receiver
Pros•Fairly long range•Transmitter power not a problem (assuming phone is charged)•Easy to develop GUI
Cons•Similar products already exist/being developed
(i.e. Tile/Treasure Tag)•Need to own a smartphone
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Our Solution
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Our Solution: BeepachU
Form: Transmitter and Receiver Technology: Bluetooth Low Energy SoC Function: Press a button on the TX. The RX will “Beep-
at-You”• TX provides Hot/Cold option in case RX outside hearing range
(Possible) Extra Functionality:• A directional TX antenna could give BeepachU a directionality
feature• Alarm mode: if transmitter/receiver are separated: “BEEP”
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Requirements: BeepachU Design Goals
Range: 100m (line of sight) Battery life: 6 months for both TX and RX Weight: TX < .5 lb, RX < .5 Ib Response time: under 2 seconds Size:
• TX < 4 square inches• RX < 3 square inches
Robust• RX will not be set off by interference signal
Cheap: Each unit < $30 when mass produced
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Our Solution: Block Diagram
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Individual Responsibilities
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Individual ResponsibilitiesDave ZeifmanProgramming SoC
Eric WagnerAntenna + Link Budget
Mark WagnerSpeakers + Team Coordination
Quanquan HanPower Supply/Power Management + UI
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SoC ProgrammingDave Zeifman
Requirements:Generate TX signalsInterpret RX signalsGenerate desired outputs from specific inputsStore “Beep” sound bite Drive audio sectionDrive RX “sniff” mode
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Speakers + Team CoordinationMark Wagner
RequirementsSpeakers must be loud enough to hearSmall enough to meet space requirementsSpeaker amplifier must be power efficientAlso responsible for managing the size/weight/cost of each item
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Antenna + Link BudgetEric Wagner
Requirements:Antenna must be matched to SoC’s transceiverAntenna should have reasonable efficiency/radiation patternAntenna must be small enough to meet size constraintsAlso responsible for managing link budget to meet 100m range requirement
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Power Supply/Management + UIQuanquan Han
RequirementsBattery must be small enough to meet TX/RX size requirementsMust last at least 6 monthsIs responsible for budgeting power use and determining duty cycle for RX “sniff” mode
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Power Supply/Management + UIQuanquan Han
UI RequirementsTransmitter UI should include
• Enough buttons to allow user to activate each feature (i.e. alarm, hot/cold, beep)
• LED’s to indicate hot/cold
Receiver UI should include• LED’s• Any buttons/ports needed for customizable sounds/features
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Deliverables
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Proposed MDR Deliverables
Demonstration of working TX/RX• TX and RX recognize each other and work at close distance• TX and RX hardware not necessarily contained in small
package (may be on a breadboard or Development Kit Module)• Not battery powered
Working speakers driven by TX/RX hardware• Small audio system will be operational• Same transceiver SoC that drives TX/RX must be able to drive
audio system.• Not battery Powered
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Schedule
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Questions?