11

Bradley University ECE Department

EE452 – Sr. Capstone Project

Computer Network Controlled Etch-A-Sketch ®

Final Presentation4/28/05

Dream Team members: Robert LodeskyArnold Bynum

Advisors: Dr. IrwinMr. Sánchez

22

Table of ContentsTable of Contents

Project SummaryProject Summary

SoftwareSoftware

HardwareHardware

33

SummarySummary

Robert

44

SummarySummary

TinaFred

55

Table of ContentsTable of Contents

Project SummaryProject Summary

SoftwareSoftware

HardwareHardware

66

SoftwareSoftware

• The letter “a”The letter “a”

• Header FileHeader File

• Input SoftwareInput Software

• Output SoftwareOutput Software

• Reset ProgramReset Program

• Alphabetical ConversionAlphabetical Conversion

77

What it takes to draw an “What it takes to draw an “a””

a

88

Header FileHeader File

Input

conversion

output

Main

reset

99

Pen ReaderPen Reader

1010

Serial Port SoftwareSerial Port Software(PC)(PC)

PCMicrocontroller

CreateFileGetCommState

Buffer 984nbdl58

SetupCommWriteFile

1111

Serial Port SoftwareSerial Port Software(Microcontroller) (Microcontroller)

MicroPac 535 PC

CRINITSERINB

Reset

CRBMR1B

Parity

Size

Reciever controls

CSRB

CRB

1212

Word finished

Go one character

back

Is pointer back at origin?

no

Yes

Ready for shaking

Is ready button

pressed

No

Prompt user for next

wordYes

r o b e r t

Ready Button

1313

Receive word

Is end found?For loop

PWM conversion

of letter

No

Send to Timing

ProcessorYes

r o b e r t

r* SW3407NW433N3…etc

o* NW3012SW4332…etc

b* W4213NW3211…etc

Solves Conversion Problems

1414

Table of ContentsTable of Contents

Project SummaryProject Summary

SoftwareSoftware

HardwareHardware

1515

EAS SystemEAS System

Etch-A-Sketch

H-Bridge Circuitry

Protection Circuitry Motors

1616

HardwareHardware

Motor ControlMotor Control H-BridgesH-Bridges

• LMD 18200 3 amp, 55 volt H-BridgeLMD 18200 3 amp, 55 volt H-Bridge Control speed and direction of motors through Control speed and direction of motors through

microcontrollermicrocontroller CCBB allows for faster switching if frequency is increased allows for faster switching if frequency is increased

CCCC bypasses rail of DC source bypasses rail of DC source

• Agilent E3634A DC Power Supply (EQ-2539)Agilent E3634A DC Power Supply (EQ-2539)

1717

LMD18200 Block DiagramLMD18200 Block Diagram

1818

HardwareHardware

Motor ControlMotor Control H-BridgesH-Bridges

• LMD 18200 3 amp, 55 volt H-BridgeLMD 18200 3 amp, 55 volt H-Bridge Control speed and direction of motors through Control speed and direction of motors through

microcontrollermicrocontroller CCBB allows for faster switching if there is an increase in allows for faster switching if there is an increase in

frequency frequency CCCC bypasses rail of DC source bypasses rail of DC source

• Agilent E3634A DC Power Supply (EQ-2539)Agilent E3634A DC Power Supply (EQ-2539)

1919

LMD18200 Block DiagramLMD18200 Block Diagram

2020

HardwareHardware

Motor ControlMotor Control H-BridgesH-Bridges

• LMD 18200 3 amp, 55 volt H-BridgeLMD 18200 3 amp, 55 volt H-Bridge Control speed and direction of motors through Control speed and direction of motors through

microcontrollermicrocontroller CCBB allows for faster switching if there is an increase in allows for faster switching if there is an increase in

frequencyfrequency CCCC bypasses rail of DC source bypasses rail of DC source

• Agilent E3634A DC Power Supply (EQ-2539)Agilent E3634A DC Power Supply (EQ-2539)

2121

LMD18200 Block DiagramLMD18200 Block Diagram

2222

HardwareHardware

Motor ControlMotor Control H-BridgesH-Bridges

• LMD 18200 3 amp, 55 volt H-BridgeLMD 18200 3 amp, 55 volt H-Bridge Control speed and direction of motors through Control speed and direction of motors through

microcontrollermicrocontroller CCBB allows for faster switching if there is an increase in allows for faster switching if there is an increase in

frequencyfrequency CCCC bypasses rail of DC source bypasses rail of DC source

• Agilent E3634A DC Power Supply (EQ-2539)Agilent E3634A DC Power Supply (EQ-2539)

2323

LMD18200 Block DiagramLMD18200 Block Diagram

2424

HardwareHardware

Motor ControlMotor Control• Port Four of MicrocontrollerPort Four of Microcontroller

Motor Speed Motor Speed • Timer 2 generates PWM signal across P4.0, P4.1Timer 2 generates PWM signal across P4.0, P4.1

Motor DirectionMotor Direction• P4.6, P4.7 alternate between +5 and 0 voltsP4.6, P4.7 alternate between +5 and 0 volts

Protection CircuitryProtection Circuitry• Optical IsolatorsOptical Isolators

2525

PWM Test SignalsPWM Test Signals

2626

4N25 Optical Isolator4N25 Optical Isolator

2727

Drawing an “O”Drawing an “O”

Look up tables used to draw lettersLook up tables used to draw letters Four look up tables totalFour look up tables total

• Vertical DirectionVertical Direction• Horizontal DirectionHorizontal Direction• Vertical SpeedVertical Speed• Horizontal SpeedHorizontal Speed

2828

Letter “O”Letter “O”

2929

The End

Real Technical Questions?

Go To: http://cegt201.bradley.edu/projects/proj2005/lescreen/

Recap:

•C++ and Assembly software working

•Hardware functioning properly

•Drew the letter “O”