Detailed design review p13265 motorcycle safety light backpack system
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Detailed Design Review P13265 Motorcycle Safety Light Backpack System. February 15 th , 2013 RIT MSDI. MSD Team. Primary Customers: Sport bike/standard riders who ride with backpacks Surrogate Customers: Aaron League Andrew Nauss Faculty Guides: Leo Farnand Vince Burolla

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Detailed design review p13265 motorcycle safety light backpack system

Detailed Design ReviewP13265Motorcycle Safety Light Backpack System

February 15th, 2013

RIT MSDI


Msd team

MSD Team

  • Primary Customers:

    • Sport bike/standard riders who ride with backpacks

  • Surrogate Customers:

    • Aaron League

    • Andrew Nauss

  • Faculty Guides:

    • Leo Farnand

    • Vince Burolla

  • Industrial Design Consultant:

    • Killian Castner

  • Team Members:

    • Mike Baer, Project Manager

    • Tyler Davis, Lead Engineer

    • Ben Shelkey, ME Project Engineer

    • TJ Binotto, EE Project Engineer

    • Eric Dixon, EE Project Engineer


Today s agenda

Today’s Agenda

  • Overview5 minutes, 1 slide

    • Project Description Recap

    • Borrowed Motorcycle Specs

  • System Model Design50 minutes, x slides

    • Family Tree, System Overview

    • System Components

    • CAD Models/Drawings

    • Component Assembly Plans

    • Schematics, Pseudo-Code

    • Bill of Materials

  • Feasibility Analysis, Prototyping, and Experimentation30 mins, x slides

    • Testing for critical components

  • Test Plans5 mins, x slides

  • Next Steps15 mins, x slides

    • Updated Risk Assessment

    • MSDII Plan

  • Conclusion, Comments15 mins, x slides


Detailed design review p13265 motorcycle safety light backpack system

I. OVERVIEW


Project description review

Project Description Review

  • This project is intended to be prototype stage for marketable product for motorcyclists:

  • Two major needs identified by motorcyclists:

  • 1. Safety

    • Hurt Report

      • Motorcyclist safety study performed by Henry Hurt, published in 1981

      • Of the accidents analyzed, ~75% of motorcycle accidents involved collision with another vehicle

      • “Failure of motorists to detect and recognize motorcycles in traffic is the predominating cause of motorcycle accidents”

  • Motorcycle Conspicuity Study

    • Riders wearing any reflective or fluorescent clothing had a 37% lower risk than other riders

    • Conclusion: “Increasing the use of reflective or fluorescent clothing, white or light coloured helmets, and daytime headlights…could considerably reduce motorcycle crash related injury and death.”

  • 2. Electronics charging

    • Most motorcyclists have no means of charging electronics


  • Project description review1

    Project Description Review

    • Conducted market survey regarding safety equipment and small electronics charging

      • Currently at 77 participants (for results visit EDGE website)

    • Summary of target market (motorcyclists who):

      • Often or always wear backpacks

        • Carry bulky items, such as books or laptops

      • Ride in 4 seasons, and wet conditions (rain, fog, snow)

      • Currently do not have method for charging electronics (such as cell phone)

        • Micro USB charging connection required

      • Believe visibility is important

        • Utilize reflective surfaces, bright colors, and lighting systems

      • Would consider upgrading their existing lights to LED lights

      • Place importance of aesthetics and durability of products


    Updated engineering specs

    Updated Engineering Specs


    Updated engineering specs1

    Updated Engineering Specs


    Borrowed motorcycle

    Borrowed Motorcycle

    • Type: 2006 Kawasaki Vulcan EN500

    • Owner: Andrew Nauss, 5th year ME

      • Gave permission to test on bike and make small modifications, if necessary

    • Not ideal type of bike for target market, but it shares same engine and electronics with the Ninja 500, a popular entry-level sport bike

    Vulcan EN500


    Detailed design review p13265 motorcycle safety light backpack system

    II. SYSTEM MODEL DESIGN


    Physical system overview backpack

    Physical System OverviewBackpack

    Brake/Running Lights

    User Control Panel On Chest Strap

    Ambient Light Sensor

    Turn Signals

    System Power Switch

    Electronics Box Inside Bottom Backpack Compartment

    Motorcycle Power Connector


    Physical system overview motorcycle

    Physical System OverviewMotorcycle

    Wireless

    Light-Signals Out

    Transmitter Box

    Power Out

    Bike Light Signals In

    Bike Power In

    (Inside Box)

    Transmitter Board w/ Xbee Transmitter


    Family tree 1 3

    Family Tree (1/3)

    Continued


    Family tree 2 3

    Family Tree (2/3)

    From Backpack Assembly

    Continued


    Family tree 3 3

    Family Tree (3/3)

    From Backpack

    Assembly


    Backpack shell

    Backpack Shell

    Shell Front

    Shell Back

    Shell Drawing


    Backpack assembly

    Backpack Assembly

    • Shell

    • Cut and assemble main compartment zipper to length.

    • Apply Liquid Nails to inside edges of top shell

    • Attach and clamp fully zipped zipper to shell following the instructions of the Liquid Nails

    • Wait for glue to fully cure

    • Safety pin unglued zipper side to soft backpack back

    • Unzip zipper

    • Sew second half of zipper to soft back

    • Cut and assemble bottom compartment zipper to length

    • Apply Liquid Nails to one connection corner of both shell halves

    • Attach only the starting section the zipper following 3-4

    • Attach the rest of the zipper using non-permanent method.

    • Using a paintmarker or sharpie make marks on shell/zipper in 1in increments (these will be used to make sure zipper and shell are lined up properly when adhering).

    • Unzip sections

    • Remove zipper from both sections and clean off non-permanent adhesive

    • Attach zippers halves to each shell section separately following 2-4.

    • Unzip

    • Apply Liquid Nails to back edge of bottom shell section.

    • Attach and clamp bottom fabric backpack flap to back edge of shell following 3-4.

    • Attach quick access panel following 9-18.

    • LEDs

    • Drill Wire holes in all light strip slots.

    • Place LED light strips in their appropriate slots with proper adhesive.

    • For each light signal slot line lens ridge with silicone sealer.

    • Press each lens into their appropriate slot.

    • Wipe off any excess sealer and allow to dry

    • Electronics Pouch, Easy Access Pouch and Other

    • Place adhesive on edges of neoprene pouch.

    • Press pouch into the top surface of the bottom backpack compartment.

    • Allow to dry.

    • For easy access pouch follow 25-27; except the easy access pouch will be attach on the inside perimeter of the easy access panel.

    • Drill hole on the bottom right side of shell in appropriate location for power switch.

    • Apply sealer to edge of hole.

    • Pop power switch into hole and hold.

    • Wipe off any excess sealer and allow to dry.

    • Drill hole in the bottom of the shell for the power cord.

    • Drill hole in specified location on top access panel for light sensor.

    • Place light sensor in through the shell.

    • Apply sealant to back of the sensor to hold in place.

    • Allow to dry.

    • Disconnect chest strap clip from strap.

    • Slide user control panel onto strap.

    • Reconnect chest strap clip.

    • Wire all components.

    • Battery Health Panel:

    • Press fit PCB into top panel

    • Apply silicone sealer to back

    • Fit back panel against the top

    • Clamp and allow to dry for appropriate time


    Lights selection

    LightsSelection

    • Lights:

      • Compared thru-hole vs. flexible strips

        • Strips proved to be better for application

      • Colored LEDs documented to be more efficient than

        using white LED with colored lens cover

      • Strips available in .5m length w/ 30 LEDs/strip

        • Can be cut into increments of 3 LEDs

          • Each 3 LED segment has necessary resistors to operate @ 12V

      • 3 sets of High Intensity 30 LED SMD Strips

        • 2 amber and 1 red

        • $15/ strip, $45 total

      • *Note: 11 sections of red strips are needed, but only 10/ strip

        • Will instead use one amber section, but will purchase 2nd red strip in MSDII if budget allows

    Flexible LED Strip


    Lights flash functionality

    LightsFlash Functionality

    1st stage brake lights

    2nd stage brake lights

    Upper Large Arrows

    Upper Small Arrows

    Dual Brightness Running/Brake Lights

    Lower Small Arrows


    Lights requirements

    LightsRequirements

    Purchase:

    1 RED strip

    2 AMBER strips

    *Note: Decision made to eliminate front shoulder strap lights due to installation complexity and marginal benefit to rider (headlight is much brighter)


    Light covers selection

    Light CoversSelection

    • Lens Covers:

      • Provide protection from elements

      • Clear thermoform acrylic sheets

        • Can bend to required shape

      • Clear:

        • ~92% Light Transmission @ 90 degrees incident to surface

      • Red and Amber:

        • ~9-15% Transmission @ 90 degrees

      • Currently in discussion with manufacturer

        • Will be sending free samples of both clear and red

        • Can hold off on purchasing until samples are received

      • Sheets will be cut to size and molded to sit flush with External Shell

    • Diffusion Material:

      • Diffusion material is not necessary and will not be used

      • Could potentially be added after completion of build

    Clear acrylic


    Electronics housing

    Electronics Housing


    Electronics housing assembly

    Electronics Housing Assembly

    Components

    • Main Housing

    • Base (Aluminum)

    • Long side (on battery side, straight, 2 holes tapped on top)

    • Long side (dividing board and battery, has slot for wires)

    • Long side (battery side, has 5 holes (2x DB9, I USB 2x 2-in-1) and 2 holes tapped on top)

    • 2x Short side (identical, each has slot in the top)

    • Top piece

    • 4 screws

    • Glue

    Assembly

    Use mill to dimension pieces to specified dimensions

    Create required holes (tapped and for plug)

    Glue long sides and short sides to base as detailed in assembly drawing

    Add board, with bushings underneath

    Install board with screws

    Install top with screws


    Transmitter box

    Transmitter Box

    24

    • Original plans were to fabricate a custom-sized waterproof box for the transmitter

    • Availability and competitive prices of prefabricated boxes outweigh the benefits of a custom box

    • Selected box: HAMMOND Plastic Instrument Enclosures Black Project Box

    Pictured: Bottom (facing up and down)

    Complete box

    Price: $4.49 (free shipping)


    Chest strap user control panel

    Chest Strap User Control Panel

    Status LED On/Off

    Hazard Button

    Light Pattern Select

    Brake/Turn Signal Function Toggle

    Status LEDs

    Control Panel (w/ Cover)

    Control Panel (Cover Off)

    View of Attachment Loop


    Chest strap user control panel1

    Chest Strap User Control Panel

    Control Panel Top

    Control Panel Bottom


    Cord retraction

    Cord Retraction

    • In order to prevent the charging cable from being caught in the rear wheel if disconnected, a retraction system is necessary.

    • Original plans resembled a retractable dog leash, but because of the size and stiffness of the wire this idea was abandoned.

    • Rather than have the wire wind up, it will be an extendable coiled wire with the male and female ends being the connectors.


    Quick connect selection criteria

    Quick-Connect Selection Criteria

    Must attach and detach both quickly and easily

    Must not shake loose

    Must have reasonable detaching pull force in order to prevent damage to other systems (if rider forgets to unplug)

    Aesthetically pleasing

    Low production cost


    Cost analysis of quick connect options

    Cost analysis of Quick-Connect options

    29

    Choice: Guitar Amp Connector

    Reasons:

    -Quicker to attach because of no directional preference

    - “Clicks” in, less likely to come off accidentally


    System block diagram

    System Block Diagram

    Backpack

    AC/DC

    12VDC

    System Block Diagram

    Electronics Housing/PCB

    Motorcycle System

    Motorcycle Battery

    12VDC

    USB Charger

    USB 2.0

    System NiMH Battery

    12VDC

    2.5mm Connector

    12V

    5V

    Quick Connect

    Transmitter Housing/PCB

    Battery Monitor / Fuses

    Voltage Regulation

    12V->5V

    5V->3.3V

    12V

    12V

    12V

    2.1mm Connector

    3.3V

    Power Switch

    12V->3.3V Regulation

    1

    µCon (MSP430)

    Xbee

    Receiver

    12V

    Darlington

    Light Drivers

    Xbee Transmitter

    2

    3

    4

    Calibrate Button

    3

    1

    2

    4

    5

    6

    7

    8

    Chest Strap Signals

    1-4. Battery Status LEDs

    • Function Toggle

    • Function Toggle Sel

    • Hazard

    • 3.3V

    Transmitter Signals

    • Headlight

    • Left Turn Signal

    • Right Turn Signal

    • Brake Light

    12 LED Groups

    Chest Strap PCB

    User Interface Buttons

    Battery Status LEDs


    Battery selection technology

    Battery SelectionTechnology

    • Re-evaluated initial selection of Li-Po battery due to safety concerns

      • For scope of project, not possible to design box that is guaranteed to prevent any damage to battery in event of crash

      • Li-Po and Li-Ion battery can catch on fire if cells are damaged, even with no current draw

    • Decided upon Ni-MH:

      • They do not catch fire when damaged

      • Still meet performance requirements

      • Downside, heavier and larger volume


    Battery selection criteria

    Battery SelectionCriteria

    • Battery selection criteria:

      • Meets minimum 12V voltage requirement (from lights)

      • Meets minimum required power draw

      • Meets maximum current draw (~3.5A worst-case)

      • Can be connected to off-the-shelf AC smart charger

        • Built in overcharge protection and thermal monitoring


    Battery selection comparison

    Battery SelectionComparison

    • Three options

      • Selection limited due to required capacity

      • Selection further limited due to 12V requirement

    • Total price includes pack, charger

      • Cost between 3 choices was negligible


    Battery selection comparison1

    Battery SelectionComparison

    • After comparing in PUGH diagram, Powerizer Flat pack/charger was chosen due to flat size and larger capacity for the same price

      • 4500 mAh, 12V, 4.2A max

      • Dimensions: 7.2 x 2.9 x .8 inches

      • Cost: $66, shipped

      • 5 day lead time before shipping


    Battery health monitor selection criteria

    Battery Health Monitor SelectionCriteria

    • Battery Health Monitor Criteria:

      • Monitor voltage levels on NiMH Battery (14.5V-10.5V)

      • Be able to load shed USB charging system at a specific voltage.

      • Shut off system as safe shutdown (10.5V)

      • Send signals to Battery Status LEDs on chest strap


    Battery health monitor charging circuit function

    Battery Health Monitor/Charging Circuit Function

    • Monitor Internal Battery Voltage

      • Send Low Bat signal to µCon at desired level

    • Isolate Internal Battery from system under the following conditions.

      • Low Battery Level

      • Connected to: Wall Charger or Bike Power


    Battery health monitor design design

    Battery Health Monitor DesignDesign

    • Compare the voltage on the supply to a reference voltage.

      • Divide voltage supply level by 3.

      • Use a 6.2V 1% precision Zener diode to set reference.

      • Use voltage divider resistor string to set reference voltage levels.


    Battery monitor charging schematic

    Battery Monitor/Charging Schematic

    Comparators

    1% Precision

    Zener Diode

    Low-Battery Flag to µCon


    Power supply selection criteria design

    Power SupplySelection Criteria / Design

    • Power Supply selection criteria:

      • Low power dissipation.

      • Low heat generation.

      • Regulate battery voltage to 5V for USB Charging System

      • Regulate battery voltage to 3.3V for µCon, Wireless, User Interface switches and Battery Status LEDs.

    • Power Supply Design

      • Vin >10V, 5V Switching Regulator, designed using Manu. Datasheet.

      • 3.3V Linear Regulator using input from 5V Switching Reg.


    Power supply schematic

    Power Supply Schematic

    5V Switching Regulator

    3.3V Linear Regulator


    Usb charger selection criteria design

    USB Charger Selection Criteria /Design

    • USB Charger Selection criteria:

      • Meet requirement of Standard USB Dedicated Charging Port

      • Maximize charging rate, while minimizing power/time.

    • USB Charger Design

      • IC Solution for a Dedicated Charging port.

      • 1A Charging Current


    Usb charger schematic

    USB Charger Schematic

    Dedicated Charging Port

    Controller

    USB Enable from µCon


    Light sensor selection criteria

    Light Sensor SelectionCriteria

    • Light Sensor selection criteria:

      • QSD124 NPN Silicon Phototransistor

      • Narrow Reception Angle of 24DEG

      • Power Dissipation is Max 100 mW


    Light sensor schematic

    Light Sensor Schematic


    Led driver selection

    LED Driver Selection

    • Drive a # of 3-LED segments requiring 200mA/segment.

    • Switch on/off using a µController input signal

      • 0V->3.3V


    Led driver schematic

    LED Driver Schematic


    Wireless transmission selection criteria

    Wireless Transmission SelectionCriteria

    • Xbee 802.15.4 Low-Power module w/ PCB Antenna

      • Little configuration required for RF Communication

      • Low-Power Consumption

      • Low Input Voltage (3.3V) and Current (50mA) requirements

      • Small Physical Size

      • Large amount of open-source documentation


    Transmitter tx board schematic

    Transmitter (Tx) Board Schematic

    Inputs

    Voltage Regulation

    Transmitter

    Bike Signals


    Microcontroller selection criteria

    Microcontroller SelectionCriteria

    • Microcontroller selection criteria:

      • Minimize controller power consumption.

      • Maximize # of I/Os.

      • Have PWM functionality.


    Microcontroller and rx schematic

    Microcontroller and Rx Schematic

    Xbee Receiver

    µController w/ JTAG Prog.

    Outputs to Light Drivers


    Chest strap system selection criteria

    Chest Strap System SelectionCriteria

    • Chest Strap criteria:

      • House User Interface Switches

      • House Battery Status LEDs

      • Minimize Power Consumption

      • Can be connected to off-the-shelf AC smart charger

        • Built in overcharge protection and thermal monitoring


    Chest strap schematic

    Chest Strap Schematic


    Pseudo code 1 2

    Pseudo-Code (1/2)


    Pseudo code 2 2

    Pseudo-Code (2/2)

    Continued from above


    Overall bill of materials

    Overall Bill of Materials


    Overall bill of materials1

    Overall Bill of Materials


    High cost items

    High Cost Items

    Battery- $66 w/shipping

    Lights- $53 w/shipping

    Microcontroller Dev. Kit - $29

    XbeeUnits - $38

    PCBs- (3x$75)

    Shell Mold Fabrication- $135 w/shipping


    Detailed design review p13265 motorcycle safety light backpack system

    III. FEASIBILITY ANALYSIS, PROTOTYPING & EXPERIMENATION


    Light system luminosity test

    Light SystemLuminosity Test

    • Three tests completed:

      • LED florescent tube strip (benchmark)

      • 4.4W 30 LED high power strip

      • 1.1 W 30 LED water resistant strip

    • Tested high-brightness and weatherproof light strips in daylight

    • Observed brightness ~100 ft away from light

    • All strips bright enough during day

    Illuminated Light Strip

    *Note: Strip was much brighter than picture shows

    Results: Lights bright enough for requirements


    Light system power consumption calculations

    Light SystemPower Consumption Calculations

    Results: With very conservative estimate, in worst-case scenario, system should operate from battery for >2 hrs


    Bike mock up transmitter box

    Bike Mock-UpTransmitter Box

    • A mock-up for transmitter placement was completed on donor bike

    • Test-fit laptop charger into inner cover

      • Dimensions are 1.75 x 4 x 1 inch (H x L x W)

    • Charger fit within cover with extra room

    • Transmitter box will be much smaller than charger => fits

    • Inner cover is protected from elements from outer cover (not pictured)

    Results: Good location determined for Tx box

    Charger

    1.75”

    1”

    4”

    Inner Cover


    Bike mock up bike battery power wire routing

    Bike Mock-UpBike Battery Power Wire Routing

    • Proper routing of the wire from the 12V bike battery is very important for several reasons:

      • Mitigation of any risk that wire can catch on rider

      • If wire detaches, should not create safety risk (i.e. catch in chain/wheel)

      • With wire attached, rider should be able to move freely

      • Rider should be able to easily attach wire

    • Considered several routing options:

      • 1. In front of seat

      • 2. Rear of seat

      • 3. Side of seat

    # 1

    # 3

    # 2


    Bike mock up bike battery power wire routing option 1

    Bike Mock-UpBike Battery Power Wire Routing: Option 1

    • Option 1 quickly eliminated due to routing over rider’s legs

      • Safety and rider discomfort issues


    Bike mock up bike battery power wire routing option 2

    Bike Mock-UpBike Battery Power Wire Routing: Option 2

    • Option 2 is possible, but not ideal

      • Space under seat for wire to route without any stress concerns

      • However, wire would have to route over seat, which could blow around in wind and create greater risk of detachment


    Bike mock up bike battery power wire routing option 3

    Bike Mock-UpBike Battery Power Wire Routing: Option 3

    Results: Option 3 is best method

    • Option 3 presents best routing method

      • No interference with rider

      • No stresses/ methods for damage to wire

      • Shortest wire length of 3 options

    Space between frame and chrome

    Mock-up Wire Routed with Seat on


    Xbee code

    Xbee Code

    Configures the TX unit

    +++

    -Grabs unit attention

    ATRE

    -Resets

    ATID 2286

    -Sets address

    ATMY 1

    -Sets my address to 1

    ATD0 3

    ATD1 3

    ATD2 3

    ATD3 3

    -Sets DIO 0 through 3 to digital input

    ATDH 0

    -Sets destination address high

    ATDL 2

    -Sets destination address of receiver

    ATIR 14

    -Sets sample rate to 20ms

    ATPR 0

    -Disables internal pull-ups

    ATWR

    -Writes to memory

    • Configures the RX unit

    • +++

    • -Grabs unit attention

    • ATRE

    • -Resets

    • ATID 2286

    • -Sets address

    • ATMY 2

    • -Sets my address to 2

    • ATD0 5

    • ATD1 5

    • ATD2 5

    • ATD3 5

    • -Sets DIO 0 through 3 to digital output

    • ATIA 1

    • -Sets I/O input address to TX address

    • ATWR

    • -Writes to memory


    Detailed design review p13265 motorcycle safety light backpack system

    IV. TEST PLAN


    Detailed design review p13265 motorcycle safety light backpack system

    V. NEXT STEPS


    Updated risk assessment 1 3

    Updated Risk Assessment (1/3)


    Updated risk assessment 2 3

    Updated Risk Assessment (2/3)


    Updated risk assessment 3 3

    Updated Risk Assessment (3/3)


    Msd ii plan overview

    MSD II Plan- Overview


    Msd ii plan overview1

    MSD II Plan- Overview


    Msd ii plan 4 week plan

    MSD II Plan- 4 week plan

    • End Week 1

      • Complete Final Assembly and Test Plans- All

    • End Week 2

      • Completed Assembly of Transmitter Housing- Ben

      • Completed Assembly of Transmitter Board- TJ

      • Completed Debugging of Transmitter Housing- TJ

    • End Week 3

      • Completed Assembly of In-bag Electronics Assembly- Ben

      • Completed In-bag Assembly Board- Eric/TJ

      • Completed Backpack External Shell- Tyler/Mike

      • Completed DC Quick Connect Assembly- Ben

    • End Week 4

      • Completed Backpack Shell Integration w/Soft Shell- Tyler

      • Completed Light/Light Cover Integration w/Shell- Mike/Tyler

      • Completed Debugging of In-Bag Assembly- Eric/ TJ


    Detailed design review p13265 motorcycle safety light backpack system

    VI. CONCLUSION, COMMENTS


    Questions

    Questions


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