CD Organizer System

1
CD Organizer System

• Senior Design I
• ECE 4532 - 01
• Instructor Dr. Joe Picone

2
Team Members
Dr. Noel Schulz Team Advisor
Brandt Howell Team Leader
Dr. Adrian Doss Industrial Advisor
Chintu Patel
Caymran Cummings
Umut Kaya
3
Problem Overview

• CD Loss
• CD Damage
• Clutter
• Slow CD Retrieval

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Solution

• A CD Organizational System connected
• to a PC would
• protect CDs from damage and loss
• allow for quick retrieval
• improve the appearance of the general environment

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Design Constraints

• Technical
• Communication Protocol RS232
• CD Selection Speed 8 s
• System Recovery Recalibration
• Turning Precision 3.25/50 sel.
• Holding Torque 1 oz/cm2

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Design Constraints Cont.

• Practical
• Product Cost lt 100
• Product Reliability 50 consec. sel.
• Product Size 13x13x10 in
• Energy Efficiency 15 Watts
• Database Integrity 1 sel. at a time

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Design Block Diagram
PC
MAX232
AVR
Photo LED
Clock
Darlington
Stepper
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Design Block Diagram
PC
MAX232
AVR
Photo LED
Clock
Darlington
Stepper
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PC

• Requirements
• Windows gt 95
• Com 1
• Purpose
• User interface
• Stores data
• Sends location to AVR

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Design Block Diagram
PC
MAX232
AVR
Photo LED
Clock
Darlington
Stepper
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MAX232

• Purpose
• Converts EIA-232 inputs from PC to 5-V TTL/CMOS
  levels to AVR and back

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Design Block Diagram
PC
MAX232
AVR
Photo LED
Clock
Darlington
Stepper
13
AVR

• Purpose
• Communicates to and from PC through MAX232
• Receives input from Photo LED for recalibration
• Receives input from clock over XTAL
• Sends signals to stepper motor for movement

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Design Block Diagram
PC
MAX232
AVR
Photo LED
Clock
Darlington
Stepper
15
Photo LED

• Specs
• 100 OHMS LIGHT. 50 k - DARK
• Purpose
• Detects light from calibration LED

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Design Block Diagram
PC
MAX232
AVR
Photo LED
Clock
Darlington
Stepper
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Clock

• Specs
• 11.0592 MHZ
• Purpose
• Allows AVR to run in real time and communicates
  with PC

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Design Block Diagram
PC
MAX232
AVR
Photo LED
Clock
Darlington
Stepper
19
Darlington

• Purpose
• Sinks current to drive stepper motor

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Design Block Diagram
PC
MAX232
AVR
Photo LED
Clock
Darlington
Stepper
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Stepper

• Purpose
• Takes signal from AVR and rotates lid to allow CD
  selection

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Software Design Interface
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Software Testing
Test Test Method Test Results
GUI updates C Compiler Pass
Database updates C Compiler Pass
Data remains after program close/reboot C Compiler Pass
Import file from user specified location C Compiler Pass
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Software Testing Cont.
Test Test Method Test Results
Open RS232 between PCs C Compiler Pass
Send data to AVR HyperTerminal Pass
Receive data from AVR HyperTerminal Pass
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Circuit Design
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Hardware Design
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Hardware Testing

• Coming soon

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Design Issues

Problem Solution
Former chip - PIC Current chip - AVR
Previous stepper required too much current Smaller stepper
Different voltage levels for PC AVR communication MAX232
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Design Issues Cont.

Problem Solution
AVRs internal clock External clock
External clock accuracy Different external clock
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Cost Analysis

• AVR AT90S1200 20 pin DIP 1.85
• ULN2803 Darlington 0.41
• Stepper Motor Unipolar 1.50
• Gears Set of 5 0.75
• Socket (Power) 0.30
• Power Supply Brick (4.5V DC, 700 mA) 4.10
• DB9F Shielded w/hood 1.30
• Ferrule 0.20
• MAX232 0.35
• Clock 11.0592 MHZ 0.26
• 2xpin Sockets 0.14
• 6ft wire Shielded 1.14
• Felt 1.00
• Lid Casing 2.50
• Reflective Photo Sensor 0.63
• Total 16.43

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Summary

• Problem Overview
• Solution
• Design Constraints
• Testing
• Design Issues
• Cost Analysis
• Goals

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Acknowledgements

• We would like to thank the following people and
  staff members for providing advice and support
• Dr. Noel Schulz
• Dr. Bob Reese
• Dr. Joe Picone
• Dr. Adrian Doss
• Mr. Jordan Goulder

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Questions

• ???