Post on 11-Jan-2016
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