ClearVisionClearVisionFinal PresentationFinal PresentationSenior Design 1Senior Design 1

Team MembersTeam Members

Travis Ann NylinElectrical Engineer

•System Testing•Schematic

•Data-Logging and Retrieval

Josh VanceElectrical Engineer

•Team Leader•ADC for Sensors•System Testing•User Interface

Scott SpeedElectrical Engineer

•Schematic•Hardware

•User Interface

Clint HowellComputer Engineer

•Website•Data-Logging and

Retrieval•ADC for Sensors

OutlineOutline ProblemProblem SolutionSolution ConstraintsConstraints

• TechnicalTechnical• PracticalPractical

Prototype DesignPrototype Design Testing of SubsystemsTesting of Subsystems

• Tilt SensingTilt Sensing• Vibration SensingVibration Sensing• Data-LoggingData-Logging• Data-RetrievalData-Retrieval• System TestSystem Test

Design II GoalsDesign II Goals

ProblemProblem

Nissan needs a device to alert a test driver of possible alignment Nissan needs a device to alert a test driver of possible alignment and/or vibration problems in newly manufactured automobiles.and/or vibration problems in newly manufactured automobiles.

Problem

Nissan’s current methods

• Visual inspection –Inaccurate and inconsistent

• Prototype device - only tests for tilt and mounts over airbag

SolutionSolution

ClearVision is a tilt and vibration detection ClearVision is a tilt and vibration detection device created for Nissan to alert a driver of device created for Nissan to alert a driver of possible alignment issues as well as vibration possible alignment issues as well as vibration issues.issues.

ClearVision’s Features• Tilt Detection• Vibration Detection• Data Logging• Mounts Above Airbag

-7.3°X

y

ConstraintsConstraints

Technical ConstraintsTechnical Constraints

Name Description

Tilt Detection Minimum range of ±90 degrees.Accuracy of ±0.5 degrees.

Vibration Detection Minimum range of ±2 g. Accurate to ±20 mg.

Power ConsumptionOperate continuously for up to 8 hours on a single

battery charge.

Display Display the measured tilt and vibration values.

Data Logging Store data at a rate of 50 Hz for up to 8 hours.

Practical ConstraintsPractical Constraints

Sustainability Durability The device must be durable enough to

move from one vehicle to another as it is mounted and dismounted.

Manufacturability Size The physical dimensions must be 12" x

2" x 4".

Practical Constraints Cont.Practical Constraints Cont.

Sustainability-DurabilitySustainability-Durability

Frequent movement from one vehicle to anotherFrequent movement from one vehicle to another It must mount and dismount quickly and securely It must mount and dismount quickly and securely The components must be secure enough to withstand this The components must be secure enough to withstand this

portability day in and day out for years to come. portability day in and day out for years to come.

Practical Constraints Cont.Practical Constraints Cont.

Manufacturability-SizeManufacturability-Size Must mount on the steering Must mount on the steering

wheel above the airbagwheel above the airbag Inner-Steering wheel Inner-Steering wheel

dimensions of 12" x 2" x 4“dimensions of 12" x 2" x 4“ Component Box dimensions of Component Box dimensions of

6.25” x 2” 6.25” x 2” x 2.5”. x 2.5”.

PrototypePrototype

Design LayoutDesign Layout

Micro

Display

USBAccelerometer

InclinometerSD

Prototype Parts

Philips LPC2148Philips LPC2148

Has onboard USB and Flash

Allows the Use of FreeRTOS

FreeRTOS

UserInterface

Task

Log Task

Micro Sensors Task

Prototype Parts

Development BoardDevelopment Board

Prototype PartsPrototype Parts

AccelerometerAccelerometer Accelerometer Breakout

Board ADXL330k +/-3 g Shock Survival of up to

10 kg

[4]

Prototype PartsPrototype Parts

InclinometerInclinometer

VTI•On-board temperature correction•Range ±30° / ±90°•Accuracy of 0.03°•Error Induced by Vibration is minimized

[11]

Prototype Mounted

TestingTesting

Testing

Tilt Vibration Data-Logging Data-Retrieval System Test

Testing: Tilt SensorTesting: Tilt Sensor

Protractor on White Board to Draw Protractor on White Board to Draw AnglesAngles

Displayed & Tested One Axis at a Displayed & Tested One Axis at a TimeTime

Testing: Tilt SensorTesting: Tilt Sensor

Testing: Tilt SensorTesting: Tilt SensorResultsResults

x y

Expected Angle

Measured Angle

Percent Error

Expected Angle

Measured Angle

Percent Error

30° 29.9 0.33% 30° 27.3 9.9%

20° 20 0.00% 20° 19.7 1.5%

10° 10 0.00% 10° 10.1 -1.0%

0° -0.1 NA  0° -0.3 NA

-10° -10 0.00% -10° -9.5 5.3%

-20° -20 0.00% -20° -19.9 0.5%

-30° -29.4 2.04% -30° -25.3 18.6%

Testing: Vibration SensorTesting: Vibration Sensor•Each Axis has a value of 1g and -1g on two of the six possible orientations

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ClearVision

ClearVision ClearVision

Upright Left Right

Upside Down

FlatFlipped

Testing: Vibration SensorTesting: Vibration Sensor

•Tested Each Axis at Each Orientation•Those Values were used to verify Accuracy

Testing: Vibration SensorTesting: Vibration SensorResultsResults

Observed Values for Vibration

Axis x y z

upright -1.02 0 0.01

left 0.01 1.012 0.02

right 0.02 -1 0

flipped 1.034 0 0

Flat 0.01 0 0.96

upside down 0.01 0.02 -0.98

Expected Values for Vibration

Axis x y z

upright -1 0 0

left 0 1 0

right 0 -1 0

flipped 1 0 0

Flat 0 0 1

upside down 0 0 -1

Data Logging and Data Retrieval

Testing: DataTesting: Data-Logging-Logging

Test of 10 SecondsTest of 10 Seconds 10.43 Actual Seconds10.43 Actual Seconds 1043 Data Points1043 Data Points

Testing: DataTesting: Data-Logging-Logging

Testing: DataTesting: Data-Logging-Logging

Testing: DataTesting: Data-Logging Capacity-Logging Capacity

Run Test for One MinuteRun Test for One Minute File Size is 160K BytesFile Size is 160K Bytes 160K*60min*8hrs = 79.8M Bytes160K*60min*8hrs = 79.8M Bytes

Testing: Data-RetrievalTesting: Data-Retrieval

Retrieve Data by Retrieve Data by USB PortUSB Port

When USB is When USB is Attached, Attached, Computer Reads Computer Reads the SD Cardthe SD Card

Data Can be Data Can be Graphed Using Any Graphed Using Any Graphing SoftwareGraphing Software

System Test

• Power On: Displays “Press Start to Begin Test”

• Must be traveling at constant velocity

•Tilt and Vibration are displayed

System Test

Green LED stays illuminated until the values are “Out of Range”

At which point the Red LED illuminates

System Test

All Data is sent to the SD Card

USB can then retrieve the file

Plan For Design IIPlan For Design II

•PCB •Mounting System•Battery with Charging System

Power ConsumptionPower Consumption

Component Current Draw

LPC2148 100 mA

LCD 5 mA

ADXL330 0.45 mA

VTI Inclinometer 5 mA

LED’s 52 mA

Power Consumption

Questions?Questions?