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Currency Identifier

Currency Identifier. ECE 445 Summer 2006 Group # 4 Wilson Yum Edward Chen TA: Alexander Spektor. Introduction. Distinguish bills using infrared Tactile output. Features. Reads $1, $5, $10, $20, $50, $100 Tactile output in standard Braille Error protection Low cost of production.

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Currency Identifier

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  1. Currency Identifier ECE 445 Summer 2006 Group # 4 Wilson Yum Edward Chen TA: Alexander Spektor

  2. Introduction • Distinguish bills using infrared • Tactile output

  3. Features • Reads $1, $5, $10, $20, $50, $100 • Tactile output in standard Braille • Error protection • Low cost of production

  4. Background • American bills are difficult to distinguish for the visually impaired

  5. Possible Solutions Euro Canadian Currency

  6. Current Solutions • Rely on non-visually impaired individuals • Different folding techniques • No commercial devices available

  7. System Overview Input Bill Recognition Output Infrared LED, Phototransistor PIC16F877A FET, Solenoid

  8. Input Hardware • 8 Infrared LEDs • 8 Infrared Phototransistors IR LED IR Reflection off Bill IR LED Phototransistor Turn on Phototransistors 8 Heat Shrink Bill Surface

  9. Input Schematic

  10. Phototransistors Infrared LEDs

  11. Bill Recognition Subtract Measurements from Stored data Analog  Digital 8 Evaluate Differences Determine Denomination 12

  12. Recognition Tolerance Count # of sensor measurement matches for each orientation Take measurements If 6 or more sensors match, mark as possible denomination Multiple denominations? 0 or more than 1 matches, output ERROR 1 match, output value Positive bill recognized

  13. PIC16F877A

  14. Outputs to FETs Inputs from infrared phototransistor

  15. ack - Output Hardware • 12 Solenoids, 12 Transistors, 3 Voltage Regulators, 12 Spike Protection Diodes Transistor From PIC power - Solenoid

  16. Output Circuit Input from PIC Three sets of four solenoids

  17. Output FETs Solenoid Array

  18. Enclosure IR LED and phototransistor opening Mounting tape Bill slot Bottom view [bottom plate removed]

  19. End Product

  20. Data Collection • 10 bills per series per denomination • 4 orientations per bill • Build test device to output integer after ADC

  21. ack - ack - ack - ack - power - power - power - power - Bill Orientations Orientation 1: Orientation 2: Orientation 4: Orientation 3:

  22. Sensor 1-2 2-3 3-4 4-5 5-6 6-7 7-8 Positions

  23. Average Voltage Standard Deviations

  24. Standard Deviation Data

  25. Data Results • Average values yield better standard deviations than differences • Using 11 as limit allows matches for each denomination • 6 or more sensors must be within limits to qualify as an identification

  26. Complications • Bill series differences • Current draw of solenoids

  27. 12% 26% 38% 24%

  28. Improvements • Solenoid • Shorter/smaller solenoid • Piezoelectric actuator • Tingle output • Infrared Emitter/Phototransistor • Voltage regulate infrared LEDs • Portable power source • Heat dissipation for extended use

  29. Feature Extensions • Summing ability • Increased Series recognition • Foreign currency recognition • Output • Audible output • Morse Code, prerecorded message • Tactile • 6 pins, series of 1 pin extension, series of zaps

  30. SWOT Conclusion • Strengths: • Bill recognition using infrared sensors proved very reliable • 100% accuracy, 100% identification • Low production cost • Weaknesses: • 25% of bill orientations did not produce positive identification on initial insertion • Power consumption of solenoids • Opportunities: • 1.3 million legally blind Americans • Extendable to foreign currencies • Threats: • New currency series

  31. Credits • Professor Gary Swenson • Alexander Spektor • Scott McDonald

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