ClearVision Final Presentation Senior Design 1

Team Members Travis Ann Nylin Electrical Engineer System Testing Schematic Data-Logging and Retrieval Josh Vance Electrical Engineer Team Leader ADC for Sensors System Testing User Interface Scott Speed Electrical Engineer Schematic Hardware User Interface Clint Howell Computer Engineer Website Data-Logging and Retrieval ADC for Sensors

Outline Problem Problem Solution Solution Constraints Constraints TechnicalTechnical PracticalPractical Prototype Design Prototype Design Testing of Subsystems Testing of Subsystems Tilt SensingTilt Sensing Vibration SensingVibration Sensing Data-LoggingData-Logging Data-RetrievalData-Retrieval System TestSystem Test Design II Goals Design II Goals

Problem Nissan needs a device to alert a test driver of possible alignment 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

Solution ClearVision is a tilt and vibration detection device created for Nissan to alert a driver of possible alignment issues as well as vibration issues. ClearVision’s Features Tilt Detection Vibration Detection Data Logging Mounts Above Airbag -7.3° X y

Constraints

Technical Constraints NameDescription Tilt Detection Minimum range of ±90 degrees. Accuracy of ±0.5 degrees. Vibration Detection Minimum range of ±2 g. Accurate to ±20 mg. Power Consumption Operate continuously for up to 8 hours on a single battery charge. DisplayDisplay the measured tilt and vibration values. Data LoggingStore data at a rate of 50 Hz for up to 8 hours.

Practical Constraints SustainabilityDurability The device must be durable enough to move from one vehicle to another as it is mounted and dismounted. ManufacturabilitySize The physical dimensions must be 12" x 2" x 4".

Practical Constraints Cont. Sustainability-Durability Frequent movement from one vehicle to another Frequent 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 portability day in and day out for years to come. The components must be secure enough to withstand this portability day in and day out for years to come.

Practical Constraints Cont. Manufacturability-Size Must mount on the steering wheel above the airbag Must mount on the steering wheel above the airbag Inner-Steering wheel dimensions of 12" x 2" x 4“ Inner-Steering wheel dimensions of 12" x 2" x 4“ Component Box dimensions of 6.25” x 2” x 2.5”. Component Box dimensions of 6.25” x 2” x 2.5”.

Prototype

Design Layout Micro Display USB Accelerometer Inclinometer SD

Prototype Parts Philips LPC2148 Has onboard USB and Flash Allows the Use of FreeRTOS

FreeRTOS User Interface Task Log Task Micro Sensors Task

Prototype Parts Development Board

Prototype Parts Accelerometer Accelerometer Breakout Board ADXL330k +/-3 g Shock Survival of up to 10 kg [4]

Prototype Parts Inclinometer VTI On-board temperature correction Range ±30° / ±90° Accuracy of 0.03° Error Induced by Vibration is minimized [11]

Prototype Mounted

Testing

Testing Tilt Vibration Data-Logging Data-Retrieval System Test

Testing: Tilt Sensor Protractor on White Board to Draw Angles Protractor on White Board to Draw Angles Displayed & Tested One Axis at a Time Displayed & Tested One Axis at a Time

Testing: Tilt Sensor

Testing: Tilt Sensor Results xy Expected Angle Measured Angle Percent Error Expected Angle Measured Angle Percent Error 30° %30° % 20°200.00%20° % 10°100.00%10° % 0°-0.1 NA 0°-0.3NA -10° %-10° % -20° %-20° % -30° %-30° %

Testing: Vibration Sensor Each Axis has a value of 1g and -1g on two of the six possible orientations ClearVision Upright Left Right Upside Down Flat Flipped

Testing: Vibration Sensor Tested Each Axis at Each Orientation Those Values were used to verify Accuracy

Testing: Vibration Sensor Results Observed Values for Vibration Axisxyz upright left right0.020 flipped Flat upside down Expected Values for Vibration Axisxyz upright00 left010 right00 flipped100 Flat001 upside down00

Data Logging and Data Retrieval

Testing: Data -Logging Test of 10 Seconds Test of 10 Seconds Actual Seconds Actual Seconds 1043 Data Points 1043 Data Points

Testing: Data -Logging

Testing: Data -Logging Capacity Run Test for One Minute Run Test for One Minute File Size is 160K Bytes File Size is 160K Bytes 160K*60min*8hrs = 79.8M Bytes 160K*60min*8hrs = 79.8M Bytes

Testing: Data-Retrieval Retrieve Data by USB Port Retrieve Data by USB Port When USB is Attached, Computer Reads the SD Card When USB is Attached, Computer Reads the SD Card Data Can be Graphed Using Any Graphing Software Data Can be Graphed Using Any Graphing 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 II PCB Mounting System Battery with Charging System

Power Consumption ComponentCurrent Draw LPC mA LCD5 mA ADXL mA VTI Inclinometer5 mA LED’s52 mA Power Consumption

Questions?