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Louisiana Tech - College of Engineering & Science
Louisiana Tech UniversityCollege of Engineering and Science
Microprocessor-Based Control System Project for Integrated Freshman Curriculum
Michael SwanbomDavis HarbourHisham Hegab
Danny Eddy
www.livingwiththelab.com
LOUISIANA TECH UNIVERSITYMECHANICAL ENGINEERING PROGRAM
Fall Winter Spring
Course Credits Course Credits Course Credits
ENGR 120 2 ENGR 121 2 ENGR 122 2
MATH 240 3 MATH 241 3 MATH 242 3
CHEM 100 2 CHEM 101 / 103 2 / 1 PHYSICS 201* 3
College of Engineering and Science
Open-Ended “Smart” Product Design Project
Louisiana Tech - College of Engineering & Science
Salinity Feedback
% Weight NaCl versus COUNT Output
y = 0.00003976x - 0.00048891
R2 = 0.980246580.00
0.05
0.10
0.15
0.20
0 500 1000 1500 2000 2500 3000 3500 4000 4500
COUNT output
% W
eigh
t NaC
l
• Conductivity is measured to determine salinity
• Two electrodes are embedded into a student-manufactured inline sensor
• A 555 circuit is used to produce AC across the electrodes
• Resulting frequency is proportional to conductivity
• Boe-Bot counts the number of cycles in a given period
• System is calibrated with known salt concentrations
Louisiana Tech - College of Engineering & Science
RTD Design (Resistance Temperature Detector)
Required Specifications
• Nominal Resistance: 100• Thickness of film: ~200nm• 5mm x 5mm solder pads• Minimum width of trace: 200μm• One RTD must fit in 2.5cm x
2.5cm square
• Length versus width tradeoff must be
calculated to achieve required nominal resistance
• Students encouraged to be creative within the guidelines
• 2D Drafting skills in SolidWorks are reinforced
Louisiana Tech - College of Engineering & Science
RTD Fabrication Steps
1. Nickel Deposition2. Spinning3. Soft Bake4. Exposure5. Development6. Hard Bake7. Etching8. Dicing9. Inspection10.Soldering11.Sealing
Red – Freshmen do not perform these stepsItalics – no picture shown
2 3
4 5
7
9
10
8
Louisiana Tech - College of Engineering & Science
Actuators
• Controller must actuate solenoid valves and a heating element to achieve control of the system
• Electrical limitations of controller are discovered
• Cascaded switching circuits are introduced
• These circuits are then implemented
Louisiana Tech - College of Engineering & Science
Total cost per student: $3.78
Louisiana Tech UniversityCollege of Engineering and Science
Freshman ProjectsLaboratory
Two classrooms designed to support the curriculum (40 students, 24 students)
Classrooms allow us to easily switch between lecture, laboratory and shop activities within a single 110 minute class period.
Louisiana Tech - College of Engineering & Science
Louisiana Tech UniversityCollege of Engineering and Science
Questions?
For More Information:Michael K. Swanbom, Ph.D.P.O. Box 10348Ruston, LA [email protected] (318) 257-3908FAX (318) 257-4630
This project was funded in part by NSF CCLI Grant No. 0618288