Safe Safe ‘‘N Sound DriverN Sound Driver(S.N.S.D.)(S.N.S.D.)

Relativity Inc.Relativity Inc.Team 3Team 3

Ari HermanAri HermanShira SilverbergShira SilverbergJoseph WaghJoseph Wagh

OverviewOverview�� ObjectiveObjective�� SpecificationsSpecifications�� ProductProduct�� LimitationsLimitations�� HardwareHardware�� Circuit DiagramCircuit Diagram�� Pictorial tourPictorial tour�� PBasic CodePBasic Code�� Prototype Cost AnalysisPrototype Cost Analysis�� Conclusion and ImprovementsConclusion and Improvements�� AcknowledgementsAcknowledgements

ObjectiveObjective

�� Build a device that helps deaf drivers Build a device that helps deaf drivers interpret where sound is coming frominterpret where sound is coming from�� Emergency VehiclesEmergency Vehicles�� Cars honking hornsCars honking horns�� Any loud noiseAny loud noise

SpecificationsSpecifications�� Product has to be controlled by BS2Product has to be controlled by BS2�� Safety featuresSafety features

�� Instantaneous shutdown safety switchInstantaneous shutdown safety switch�� Software Feature to prevent damage to the BS2 and other componenSoftware Feature to prevent damage to the BS2 and other componentsts

�� User Interface User Interface �� Monitoring soundMonitoring sound

�� User ControlUser Control�� Controlling sensitivityControlling sensitivity

�� Analog SensorAnalog Sensor�� MicrophonesMicrophones

�� Digital Sensor Digital Sensor �� Photoresistor (Light/Dark)Photoresistor (Light/Dark)

�� Use sensory feedbackUse sensory feedback�� Indicates sound directionIndicates sound direction

What is the Safe What is the Safe ‘‘N Sound Driver?N Sound Driver?�� AidAid for deaf and hard of hearing driversfor deaf and hard of hearing drivers�� Uses multiple microphones to detect direction of soundUses multiple microphones to detect direction of sound�� User InterfaceUser Interface

�� Dashboard mounted display Dashboard mounted display �� Uses LEDs to indicate hazard directionUses LEDs to indicate hazard direction�� Bright LED to let the driver know a loud sound has occurredBright LED to let the driver know a loud sound has occurred

�� Under low light settings, Bright LED is dimmedUnder low light settings, Bright LED is dimmed�� Settings for High / Low sensitivitySettings for High / Low sensitivity�� Microphone Receptacle Microphone Receptacle

�� Roof mountable Roof mountable –– MagnetizedMagnetized�� AerodynamicAerodynamic�� Water resistantWater resistant

�� Powered off the car cigarette lighter Powered off the car cigarette lighter �� quarter amp fuse includedquarter amp fuse included

LimitationsLimitations

�� THIS IS AN AID ONLY THIS IS AN AID ONLY –– DO NOT RELY DO NOT RELY SOLELY ON THE SOLELY ON THE S.N.S.D.S.N.S.D. THE DRIVER MUST THE DRIVER MUST PAY ATTENTION TO THE ROAD AT ALL PAY ATTENTION TO THE ROAD AT ALL TIMESTIMES

�� Assumes only one audible road hazard at Assumes only one audible road hazard at any given timeany given time

�� Background noise level is moderate Background noise level is moderate compared to hazard noise levelcompared to hazard noise level

Key HardwareKey Hardware

�� 3 Microphones3 Microphones�� OmniOmni--directionaldirectional�� 7070--10,000 Hz 10,000 Hz

response response �� Requires 2Requires 2--10VDC10VDC

�� PhotoresistorPhotoresistor

Key Hardware 2Key Hardware 2

�� LM324 Quad Op AmpLM324 Quad Op Amp�� MPC3208 Analog to Digital MPC3208 Analog to Digital

ConverterConverter�� 8 Channel addressable8 Channel addressable�� 12 Bit A2D12 Bit A2D�� Minimum clock frequency 10 Minimum clock frequency 10

kHzkHz

�� +/+/-- 5 Volt Power rectifier5 Volt Power rectifier

Circuit Diagram 1: Hazard DetectionCircuit Diagram 1: Hazard Detection

Back

Left

10µF1kO

1MO

-

+

100pF 1kO

MCP3208

8 channel - 12 bitA2D

Right

10µF1kO

1MO

-

+

100pF 1kO

Back

10µF1kO

1MO

-

+

100pF 1kO

Vdd

Agnd

Clk

DOUT

DIN

/cs

Dgnd

Vref

1kO

1kO

1kO

RightLeft

Voltage Rectifier

12V

Control On

Gnd

Cigarette LighterPlug +5V out

Gnd

-5V out

TO BS2

.25A Fuse

Circuit Diagram 2: BS2 and User InterfaceCircuit Diagram 2: BS2 and User Interface

MCP3208

8 channel - 12 bitA2D

Vdd

Agnd

Clk

DOUT

DIN

/cs

Dgnd

Vref

Voltage Rectifier

12V

Gnd

Cigarette LighterPlug

.25A Fuse

FromMicrophone

circuitryBS2

Pin 15

Pin 13

Pin 12

Pin 9

Pin 4

Pin 14

Pin 3

Pin 2

Pin 1

Pin 0

To BS2

+12VRectified by BS2

1kO

1kO

1kO

470O

SPDT SwitchSensitivity control

1kO

VDD

VDD

10kO

VDD

Photo-Resistor

1kO

Pictorial Tour: Safe NPictorial Tour: Safe N’’ Sound DriverSound Driver

Pictorial Tour: Main Circuitry 1Pictorial Tour: Main Circuitry 1

Pictorial Tour: User Interface CasingPictorial Tour: User Interface Casing

Pictorial Tour: Microphone ReceptaclePictorial Tour: Microphone Receptacle

Pictorial Tour: User Interface Casing in CarPictorial Tour: User Interface Casing in Car

Pictorial Tour: Microphone Receptacle on CarPictorial Tour: Microphone Receptacle on Car

Pictorial Tour: Interfaced with Cigarette LighterPictorial Tour: Interfaced with Cigarette Lighter

PBasic CodePBasic Code

Code for Safe N Sound DriverCode for Safe N Sound Driver

Prototype Cost AnalysisPrototype Cost AnalysisProduct Quantity Unit Price Total Cost

BS2,Board of Education and kit 1 $130.00 $130.00Omni-directional Microphone 3 $2.49 $7.47Solder 1 $2.99 $2.99Soldering tip 1 $1.99 $1.991/4 Amp Fuse 1 $1.59 $1.59Fuse Holder 1 $1.99 $1.99Illuminated Power Switch 1 $3.69 $3.69Casing Hardware 1 $2.38 $2.38PC Boards 1 $6.98 $6.98IC Pin Socket 2 $0.99 $1.98Shrink Wire Tubing 1 $1.95 $1.95Casing 1 $6.99 $6.99Wire 1 $3.99 $3.99Velcro 1 $1.49 $1.49Cigarette lighter plug 1 $3.49 $3.49Cigarette lighter outlet 1 $6.49 $6.49Capacitors 3 $0.99 $2.97Epoxy Paste 1 $4.99 $4.99Super Bright Jumbo LED 1 $2.59 $2.59Power Rectifier 1 $1.00 $1.00Diodes 1 $2.49 $2.49Microphone Casing 1 $9.97 $9.97Magnets 2 $1.00 $2.00Various Resistors/Capacitors/LEDs etc 1 $5.00 $5.00Battery Clip 1 $1.39 $1.39Analog to Digital Converter 1 $18.00 $18.00

SUBTOTAL $235.86TAX (8.625%) $20.34TOTAL $256.20

Projected Mass Produced Price $50

Driving Safely - Priceless

Conclusion and ImprovementsConclusion and Improvements

�� Prototype was a successPrototype was a success�� Multiple LEDs in each direction for sound Multiple LEDs in each direction for sound

levellevel�� More accurate microphonesMore accurate microphones�� Wireless connection between user Wireless connection between user

interface and roof mountinginterface and roof mounting�� Ability to interpret different soundsAbility to interpret different sounds

�� Scan for frequencies reserved for Scan for frequencies reserved for communication by emergency personnelcommunication by emergency personnel

AcknowledgementsAcknowledgements�� Chani HermanChani Herman

�� Deaf Driver Deaf Driver -- Inspiration for the Safe Inspiration for the Safe ‘‘N Sound DriverN Sound Driver�� The Christian Music WebThe Christian Music Web

�� http://www.christianmusicweb.com/microphones/mic_project.htmlhttp://www.christianmusicweb.com/microphones/mic_project.html�� Interfacing a condenser MicrophoneInterfacing a condenser Microphone

�� Hong WongHong Wong�� Graduate Assistant, Department of Mechanical Engineering, Graduate Assistant, Department of Mechanical Engineering,

Polytechnic University.Polytechnic University.�� Power RectifierPower Rectifier�� GuidanceGuidance

�� Graphics: Radio Shack, Microchip Technology Inc., Marlin Graphics: Radio Shack, Microchip Technology Inc., Marlin P. Jones& Assoc. Inc., and P. Jones& Assoc. Inc., and http://members.tripod.com/~fencer1/page8.htmlhttp://members.tripod.com/~fencer1/page8.html