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Innovative Currency Recognition System for the Visually Impaired Using Infrared Technology

This project presents a low-cost currency recognition system aimed at assisting visually impaired individuals in distinguishing between American banknotes. By utilizing infrared sensors, tactile outputs in standard Braille, and ensuring error protection, the system reads various denominations ($1, $5, $10, $20, $50, and $100) with high accuracy. The paper discusses background challenges faced by the visually impaired, outlines the system overview from input bill recognition to output mechanisms, and explores future opportunities for enhancements, including international currency recognition.

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Innovative Currency Recognition System for the Visually Impaired Using Infrared Technology

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Presentation Transcript

  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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