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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

Currency Identifier

ECE 445

Summer 2006

Group # 4

Wilson Yum

Edward Chen

TA: Alexander Spektor


Introduction
Introduction

  • Distinguish bills using infrared

  • Tactile output


Features
Features

  • Reads $1, $5, $10, $20, $50, $100

  • Tactile output in standard Braille

  • Error protection

  • Low cost of production


Background
Background

  • American bills are difficult to distinguish for the visually impaired


Possible solutions
Possible Solutions

Euro Canadian Currency


Current solutions
Current Solutions

  • Rely on non-visually impaired individuals

    • Different folding techniques

  • No commercial devices available


System overview
System Overview

Input

Bill Recognition

Output

Infrared LED,

Phototransistor

PIC16F877A

FET, Solenoid


Input hardware
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



Phototransistors

Infrared LEDs


Bill recognition
Bill Recognition

Subtract Measurements from

Stored data

Analog  Digital

8

Evaluate Differences

Determine Denomination

12


Recognition tolerance
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



Outputs to FETs

Inputs from infrared phototransistor


Output hardware

ack -

Output Hardware

  • 12 Solenoids, 12 Transistors, 3 Voltage Regulators, 12 Spike Protection Diodes

Transistor

From PIC

power -

Solenoid


Output circuit
Output Circuit

Input from PIC

Three sets of four solenoids


Output FETs

Solenoid Array


Enclosure
Enclosure

IR LED and phototransistor opening

Mounting tape

Bill slot

Bottom view [bottom plate removed]



Data collection
Data Collection

  • 10 bills per series per denomination

  • 4 orientations per bill

  • Build test device to output integer after ADC


Bill orientations

ack -

ack -

ack -

ack -

power -

power -

power -

power -

Bill Orientations

Orientation 1:

Orientation 2:

Orientation 4:

Orientation 3:





Data results
Data Results 7-8

  • 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


Complications
Complications 7-8

  • Bill series differences

  • Current draw of solenoids


12% 7-8

26%

38%

24%


Improvements
Improvements 7-8

  • Solenoid

    • Shorter/smaller solenoid

    • Piezoelectric actuator

    • Tingle output

  • Infrared Emitter/Phototransistor

    • Voltage regulate infrared LEDs

  • Portable power source

  • Heat dissipation for extended use


Feature extensions
Feature Extensions 7-8

  • 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


Swot conclusion
SWOT Conclusion 7-8

  • 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


Credits
Credits 7-8

  • Professor Gary Swenson

  • Alexander Spektor

  • Scott McDonald


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