Bradley University ECE Department

1
Bradley University ECE Department EE452 Sr.
Capstone Project Computer Network Controlled
Etch-A-Sketch Final Presentation 4/28/05 Dream
Team members Robert Lodesky Arnold
Bynum Advisors Dr. Irwin Mr. Sánchez
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Table of Contents

• Project Summary
• Software
• Hardware

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Summary
Robert
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Summary
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Table of Contents

• Project Summary
• Software
• Hardware

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Software

• The letter a
• Header File
• Input Software
• Output Software
• Reset Program
• Alphabetical Conversion

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What it takes to draw an a
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Header File
Main
Input
output
conversion
reset
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Pen Reader
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Serial Port Software(PC)
CreateFile
GetCommState
SetupComm
WriteFile
Microcontroller
PC
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Serial Port Software(Microcontroller)
CRB
CRINIT
SERINB
MR1B
CRB
CSRB
PC
MicroPac 535
Reset
Parity Size Reciever controls
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r o b e r t
Ready Button
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r o b e r t
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Table of Contents

• Project Summary
• Software
• Hardware

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EAS System
Etch-A-Sketch
Protection Circuitry
H-Bridge Circuitry
Motors
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Hardware

• Motor Control
• H-Bridges
• LMD 18200 3 amp, 55 volt H-Bridge
• Control speed and direction of motors through
  microcontroller
• CB allows for faster switching if frequency is
  increased
• CC bypasses rail of DC source
• Agilent E3634A DC Power Supply (EQ-2539)

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LMD18200 Block Diagram
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Hardware

• Motor Control
• H-Bridges
• LMD 18200 3 amp, 55 volt H-Bridge
• Control speed and direction of motors through
  microcontroller
• CB allows for faster switching if there is an
  increase in frequency
• CC bypasses rail of DC source
• Agilent E3634A DC Power Supply (EQ-2539)

19
LMD18200 Block Diagram
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Hardware

• Motor Control
• H-Bridges
• LMD 18200 3 amp, 55 volt H-Bridge
• Control speed and direction of motors through
  microcontroller
• CB allows for faster switching if there is an
  increase in frequency
• CC bypasses rail of DC source
• Agilent E3634A DC Power Supply (EQ-2539)

21
LMD18200 Block Diagram
22
Hardware

• Motor Control
• H-Bridges
• LMD 18200 3 amp, 55 volt H-Bridge
• Control speed and direction of motors through
  microcontroller
• CB allows for faster switching if there is an
  increase in frequency
• CC bypasses rail of DC source
• Agilent E3634A DC Power Supply (EQ-2539)

23
LMD18200 Block Diagram
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Hardware

• Motor Control
• Port Four of Microcontroller
• Motor Speed
• Timer 2 generates PWM signal across P4.0, P4.1
• Motor Direction
• P4.6, P4.7 alternate between 5 and 0 volts
• Protection Circuitry
• Optical Isolators

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PWM Test Signals
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(No Transcript)
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Drawing an O

• Look up tables used to draw letters
• Four look up tables total
• Vertical Direction
• Horizontal Direction
• Vertical Speed
• Horizontal Speed

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Letter O
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• Recap
• C and Assembly software working
• Hardware functioning properly
• Drew the letter O

Real Technical Questions? Go To
http//cegt201.bradley.edu/projects/proj2005/lescr
een/