Group #18

Biometric Padlock

The Biometric Padlock Team

Jim Turner

Jerry Guzolik

Sasant Nuthakki

Blaise Kapombe

Nathan Harris

What are the problems with existing padlocks?

Forgotten / Lost / Stolen

– password

– key

– combination / code

What is a biometric?

A biometric is a unique, measurable characteristic or trait of a human being for automatically recognizing or verifying identity.

Why the fingerprint biometric ?

• Fingerprints are very unique.

“… statistically it is likely that 50 people on Earth share a fingerprint.”

http://biometricaccess.com• Easily collected• Many commercial sensors available• non-intrusive (Accepted by the public)

How can implementing a biometric improve these problems?

No password to remember No key to carry with you Fingerprint is not easily stolen Nearly impossible to forget a finger at home

Block Diagram

User Interface and Operation

Biometric PadlockDimensions and Weight

Size: 6” x 2” x 5”

L x W x H

Weight: Less than 5 lbs

Locking Mechanism

Veridicom Fingerprint Sensor

•Small size •Low power consumption•Finger sensing software

PC104 SBC

•Identical Architecture to the PC

•104 Pins

Why the PC104?

• Compatible with the standard PC

• The PC104 is the standard for embedded applications

• Meets requirements for reading from the sensor

• Meets requirements for running our software

• Small dimensions

PC104

Advantages• Has nearly every function of a PC• Develop software on PC • Easily run DOS executables• Can use any Processor• Portable because of size

PC104

Processor

• Intel 80386 CPU• Cheapest Available Processor• Will run matching software efficiently

PC104

Memory

• 8MB memory chip• sufficient memory for OS, template, and software

PC104

Interfacing

• Parallel ports used for:– input from sensor– buttons– LCD display

PC104

Specifications• +5V (low power

consumption)• 0.6lbs (lightweight)

•(3.5” X 3.7” X 0.6”) (compact)

PC104

Total Power Requirements

Total Power RequirementsDevice Voltage (V) Current (mA)

Processor/PC104 5 270Solenoid/Lock Disengage 5 500

LCD 3-5.5 40-60Veridicom Sensor 4.75-5.25 40

Totals 5 870

Total Power Requirements

• Battery life is normally determined from the milliamp-hrs

(mA-h) given on various battery spec sheets.

• For the biometric padlock, we will need a battery that wouldsupply approximately 1000 mA-h.

• With 1000 mA-h, the lock would supply the user withapproximately 207 applications.

Battery Selection

The following is a list batteries that are available to our design application:

NiCd (Nickel Cadmium)

NiMH (Nickel Metal Hydride)

Li-ion (Lithium Ion)

SLA (Sealed Lead Acid)

Battery research has led to two selections currently being considered by the design team.

1) Nickel Cadmium (NiCd)

2) Lithium Ion (Li-ion)

Battery Selection

Nickel CadmiumPros

Fast/Simple charge

High Number of charge/discharge cycles

Economically Priced

ConsSubject to memory

Has a high discharge rate

Battery Selection

Lithium Ion

ProsBetter manufacturing techniques will reduce price by 50% after the year 2000.

Very low self discharge

High Number of charge/discharge cycles

ConsExpensive

Battery Selection

NiCd Rechargeable Battery Circuit

110V 60Hzsourceconverted to DCvoltage

RC Circuitdepending onbatteryvoltage used

NiCdBattery

Value of CurrentLimitingResistor Depends onBatteryVoltage

Power toPC 104

Vout R4

C11uF

D1DIODE

R3

Q2NPN

R2

S1

R1

Q1PNP

+V1

+-

+-

VcVs11

“http://DesignNotes.com”

Li-ion Rechargeable Battery Circuit

-

+Lithium IonBattery

Vreg Vreg

Operational Transconductance Amplifier

30V max DC Source with Current Limiter

V30V

V15V

C11uF

+ V2

D2DIODE

VsourceD1

DIODE

Q2NPN

Q1PNP

R4

R3

R2

R1

“http://www.epanorama.net”

Software

Operating System: MSDOS

Programming Language:• C • Veridicom Software Development kit(SDK)

The SDK Components• Image Suite (image capture and quality assessment)• Verification Suite (minutiae extraction and matching)• Low Level Control Suite

Programs housed on PC104 Memory .exe, OS, Veridicom Software Supporting libraries (< 8 M.B.)

Flow Chart

Q & A

Minutiae Points

Bifurcation

Termination