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 MANAGERPATRICK SMITH, DEONTE HICKS, TREVIN REAVES

MICROCONTROLLER - BASED ROBOTIC CAR

DESIGN PROCESS:DEFINING THE PROBLEM

PROJECT OVERVIEWThe 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.

• 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

DESIGN PROCESS:BRAINSTORMING IDEAS

BRAINSTORMING IDEAS

BRAINSTORMING IDEAS

TWO PRELIMINARY DESIGNS4 Motor Design 2 Motor Design

4 MOTOR DESIGN ANALYSIS

Pros:- High speed capability- Efficient- Assessable materialsCons:- Cost- Feasibly- Complexity of program

2 MOTOR DESIGN ANALYSIS

Pros:- Cost- Simplicity- Complexity of programCons:- Less speed capabilities- Efficiency of a pivot wheel

THE INITIAL DESIGN

2 Motor Design

DESIGN PROCESS:DESIGN BUILD AND

EVOLUTION

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.

THE CAR

AUTOCAD DESIGN

COST ANALYSISPart Retail Price Quantity Used Total Cost Team Cost Source

Chassis $2.50 1 $2.50 $0.00 CSMArduino UNO $6.25 1 $6.25 $0.00 CSMBreadboard $3.59 1 $3.59 $0.00 CSM

Optical Sensor $13.33 2 $26.66 $0.00 CSMContinuous Servo Motor $8.59 2 $17.18 $0.00 CSM

Breadboard Cables $0.06 12 $0.72 $0.00 CSMWheel $1.25 2 $2.50 $0.00 George

Mounting Bracket $0.30 4 $1.20 $0.00 DeontePivot Wheel $1.25 1 $1.25 $1.25 Amazon.com

Fasteners $0.24 12 $2.88 $0.00 Deonte9 Volt Battery $3.49 1 $3.49 $3.49 Walmart.com

9 Volt Battery Adapter $0.60 1 $0.60 $0.00 CSMWood Block $1.89 (1/4) $0.47 $0.00 George

$69.29$4.74

Bill of Materials

Total CostTotal Cost to Team

CIRCUIT DESIGN

THE PROGRAM

DESIGN PROCESS:TESTING AND EVALUATION

TEST RESULTSTrial Time (Seconds)

1 Fail2 Fail3 44.744 43.895 Fail6 Fail7 46.518 45.549 46.02

10 46.4811 45.8912 45.6313 46.3814 46.4615 46.52

Average 45.82

Testing Results

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.

CAR DEMONSTRATION