Mid-Semester PresentationMid-Semester Presentation

Senior Design 2Senior Design 2

February 23, 2010February 23, 2010

Randall Vaughan

Sine Wave Generation

Layout and Design

Apparatus Design

Mux Interfacing

Caroline Quijano

Op-Amp Configuration

Layout and Design

Apparatus Design

Mux Interfacing

Zach Jordan

Op-Amp Configuration

Microcontroller Interfacing

Footprints and Schematic Design

Jonathan Lynch

Sine Wave Generation

Website Design

Circuit Board Production

Schematic Design

Electrical Engineering Computer Engineering

Electrical Engineering Electrical Engineering

ProblemProblem SolutionSolution ConstraintsConstraints

• TechnicalTechnical• PracticalPractical

Progress and RefinementsProgress and Refinements Future PlanFuture Plan Testing PlanTesting Plan

Dr. Jack Liu of the Department of Dr. Jack Liu of the Department of Forestry Products requires the use of Forestry Products requires the use of a portable RF moisture content a portable RF moisture content sensorsensor

Needs a smaller, inexpensive, Needs a smaller, inexpensive, repackage of his patented prototype repackage of his patented prototype

The Actual RF Apparatus[1]

Repackage his working prototype by using integrated circuits to replace test-bench equipment.

Power Supply

Amplifier

MicrocontrollerWaveform Generator

Display

Transmitting/Receiving

Sensors

Technical ConstraintsTechnical Constraints

Practical ConstraintsPractical Constraints

Constraint Description

Voltage LevelThe signal applied to the sensors must measure 80V (+/- 5V) peak-to-peak.

Frequency The sensor must produce a 250 kHz (+/- 5 kHz) sine wave.

InterfaceThe device must have a simple user interface in order to display its measurements.

Data LoggingThe device must be able to store at least 130 kilobytes of moisture content readings.

Sensor ArrayThe device must use seven 4 in. by 4 in. sensors configured in an array.

Type Constraint Description

Environmental DurabilityThe device must be able to withstand various industrial conditions such as dust and electrical noise.

Health and Safety

SafetyUser contact with high voltage signals must be prevented.

Sensor must Sensor must withstand debris, withstand debris, electrical noise, electrical noise, and moistureand moisture

Sealed, electrically Sealed, electrically shielded, rugged shielded, rugged housinghousing

[2]

Isolated high Isolated high voltagesvoltages

Appropriate Appropriate warning labels warning labels displayeddisplayed

[3]

Oriented Strand Board Capacitive

Sensors

Voltage Dividers

S1

S2

S3

S4

S5

S7

S6

Multiplexer System/ Voltage Dividers

Signal Generator/Amplifiers

Microcontroller/ Mux /Digital Potentiometer

Voltage Regulators

Route PCBRoute PCB

V Out SENSOR 1

SENSOR 2

SENSOR 3

SENSOR 4

SENSOR 5

SENSOR 6

SENSOR 7

Front

Back

POWER COM PORT

Populate PCB Populate PCB

Calibrate deviceCalibrate device

By using Jack Lui’s By using Jack Lui’s pre-tested OSBpre-tested OSB

• Measuring the Measuring the specific gravityspecific gravity

• Measuring the Measuring the moisture content moisture content

[1] Radio Frequency Evaluation of Oriented Strand Board, by Xiaojian Liu, Starkville MS. [1] Radio Frequency Evaluation of Oriented Strand Board, by Xiaojian Liu, Starkville MS. [Online]Available: http://chevelle.its.msstate.edu:6777/attach/XiaojianLiuDissertation%20-[Online]Available: http://chevelle.its.msstate.edu:6777/attach/XiaojianLiuDissertation%20-%20RADIO%20FREQUENCY%20EVALUATION%20OF%20ORIENTED%20STRAND%20BOARD.pdf?%20RADIO%20FREQUENCY%20EVALUATION%20OF%20ORIENTED%20STRAND%20BOARD.pdf?sid=&mbox=INBOX&charset=escaped_unicode&uid=2012&number=7&filename=XiaojianLiuDisid=&mbox=INBOX&charset=escaped_unicode&uid=2012&number=7&filename=XiaojianLiuDissertation%20-%20RADIO%20FREQUENCY%20EVALUATION%20OF%20ORIENTED%20STRANDssertation%20-%20RADIO%20FREQUENCY%20EVALUATION%20OF%20ORIENTED%20STRAND%20BOARD.pdf.%20BOARD.pdf.

[2] Microsoft Office Online, Clip Art. 2009. [2] Microsoft Office Online, Clip Art. 2009. http://office.microsoft.com/en-us/clipart/results.aspx?http://office.microsoft.com/en-us/clipart/results.aspx?qu=warning&sc=20qu=warning&sc=20..

[3] Google Images. 2009. [3] Google Images. 2009. http://albas.id.au/images/temp/Caution%20electrical%20shockhttp://albas.id.au/images/temp/Caution%20electrical%20shock%20hazard%20inside%20sign.bmp.%20hazard%20inside%20sign.bmp.

[4] Forestry Facts: Guide for Using the Oven-Dry Method for Determining the Moisture Content [4] Forestry Facts: Guide for Using the Oven-Dry Method for Determining the Moisture Content of Wood, by R.S Boone and E.M. Wengert, Madison, Wisconsin, 1998. [Online] Available:of Wood, by R.S Boone and E.M. Wengert, Madison, Wisconsin, 1998. [Online] Available:

http://forest.wisc.edu/extension/Publications/89.pdfhttp://forest.wisc.edu/extension/Publications/89.pdf..

[5] Wood Products Notes: Methods of Moisture Content Measurement in the Lumber and [5] Wood Products Notes: Methods of Moisture Content Measurement in the Lumber and Furniture Industries, by Phil Mitchell, Raleigh, NC. [Online]Available: Furniture Industries, by Phil Mitchell, Raleigh, NC. [Online]Available: http://www.ces.ncsu.edu/nreos/wood/wpn/methods_moisture.htmhttp://www.ces.ncsu.edu/nreos/wood/wpn/methods_moisture.htm. .

[6] United States of America. Federal Communications Commission. [6] United States of America. Federal Communications Commission. Code of Federal Code of Federal Regulations, Title 47, Part 15.Regulations, Title 47, Part 15. Washington, D.C.: Federal Communications Commission, 2008. Washington, D.C.: Federal Communications Commission, 2008.

[7] Panel Layup Operations, by Phil Mitchell, Raleigh, NC. [Online] Available: [7] Panel Layup Operations, by Phil Mitchell, Raleigh, NC. [Online] Available: http://www.ces.ncsu.edu/nreos/wood/RMOG/Adobe/Panel.pdfhttp://www.ces.ncsu.edu/nreos/wood/RMOG/Adobe/Panel.pdf..