1. College of Southern Maryland
EGR 1100 – Introduction to Engineering
Professor Fawaz Roumani, Ph.D. & Professor Gobi Gopinath
Spring 2015
April 29th, 2015
TEAM 2
GEORGE JENKINS – PROJECT MANAGER
PATRICK SMITH, DEONTE HICKS, TREVIN REAVES
MICROCONTROLLER - BASED ROBOTIC CAR

2. DESIGN PROCESS:
DEFINING THE PROBLEM

3. PROJECT OVERVIEW
The purpose is to design, build, and test a
mechanically/electrically driven robotic car, controlled by a
microcontroller, which can autonomously navigate a black-line
track to the end of a course.

4. • Must be self contained and portable.
• Safe to operate.
• Power source should be batteries.
• Weigh under 6 pounds.
• Area under 100 in2
• Volume under 600 in3
• Build a quality design that looks
professional.
• Follow a 1 inch wide black line for
approximately 15 feet.
• Complete the course in under 1 minute.
• Utilize the Arduino-UNO microcontroller.
• Maneuver turns and straight paths.
• Stay within the 6 inch borders of the track.
• Develop a control logic to steer the car.
• Program the microcontroller to control the
car.
DESIGN CRITERIA

5. DESIGN PROCESS:
BRAINSTORMING IDEAS

6. BRAINSTORMING IDEAS

7. BRAINSTORMING IDEAS

8. TWO PRELIMINARY DESIGNS
4 Motor Design 2 Motor Design

9. 4 MOTOR DESIGN ANALYSIS
Pros:
- High speed capability
- Efficient
- Assessable materials
Cons:
- Cost
- Feasibly
- Complexity of program

10. 2 MOTOR DESIGN ANALYSIS
Pros:
- Cost
- Simplicity
- Complexity of program
Cons:
- Less speed capabilities
- Efficiency of a pivot wheel

11. THE INITIAL DESIGN
2 Motor Design

12. DESIGN PROCESS:
DESIGN BUILD AND EVOLUTION

13. DESIGN EVOLUTION
• Changed chassis design.
• Changed DC to Continuous Servo Motors.
• 2 brackets to secure motors instead of 1.
• Added wood block to pivot wheel.
• Moved pivot wheel to the back.
• Removed motor shield.
• Added breadboard to design.
• Increased distance between sensors.

14. THE CAR

15. AUTOCAD DESIGN

16. COST ANALYSIS
Part Retail Price Quantity Used Total Cost Team Cost Source
Chassis $2.50 1 $2.50 $0.00 CSM
Arduino UNO $6.25 1 $6.25 $0.00 CSM
Breadboard $3.59 1 $3.59 $0.00 CSM
Optical Sensor $13.33 2 $26.66 $0.00 CSM
Continuous Servo Motor $8.59 2 $17.18 $0.00 CSM
Breadboard Cables $0.06 12 $0.72 $0.00 CSM
Wheel $1.25 2 $2.50 $0.00 George
Mounting Bracket $0.30 4 $1.20 $0.00 Deonte
Pivot Wheel $1.25 1 $1.25 $1.25 Amazon.com
Fasteners $0.24 12 $2.88 $0.00 Deonte
9 Volt Battery $3.49 1 $3.49 $3.49 Walmart.com
9 Volt Battery Adapter $0.60 1 $0.60 $0.00 CSM
Wood Block $1.89 (1/4) $0.47 $0.00 George
$69.29
$4.74
Bill of Materials
Total Cost
Total Cost to Team

17. CIRCUIT DESIGN

18. THE PROGRAM

19. DESIGN PROCESS:
TESTING AND EVALUATION

20. TEST RESULTS
Trial Time (Seconds)
1 Fail
2 Fail
3 44.74
4 43.89
5 Fail
6 Fail
7 46.51
8 45.54
9 46.02
10 46.48
11 45.89
12 45.63
13 46.38
14 46.46
15 46.52
Average 45.82
Testing Results

21. DESIGN EVALUATION
• The car was able to stay within the borders of the track and fully
completed the track under a minute.
• The car utilizes Arduino, is safe to operate, and portable.
• The car meets all size requirements by having:
- Area of 44 in2 (5.5 in x 8 in)
- Volume of 132in3 ( 5.5 in x 8 in x 3 in)
- Weight of 1.4 lbs.
• Design meets all the given criteria.

22. CAR DEMONSTRATION