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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

slide10
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

slide14
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

slide17
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
  • 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
  • Bill series differences
  • Current draw of solenoids
slide28
12%

26%

38%

24%

improvements
Improvements
  • 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
  • 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
  • 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
  • Professor Gary Swenson
  • Alexander Spektor
  • Scott McDonald
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