Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Voltage optimisation wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Buck converter wikipedia , lookup
Mains electricity wikipedia , lookup
Alternating current wikipedia , lookup
Rectiverter wikipedia , lookup
Immunity-aware programming wikipedia , lookup
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 Padlock Dimensions and Weight Size: 6” x 2” x 5” LxWxH 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 • 0.6lbs (low power consumption) (lightweight) •(3.5” X 3.7” X 0.6”) (compact) PC104 Total Power Requirements Device Processor/PC104 Solenoid/Lock Disengage LCD Veridicom Sensor Totals Total Power Requirements Voltage (V) Current (mA) 5 270 5 500 3-5.5 40-60 4.75-5.25 40 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 would supply approximately 1000 mA-h. • With 1000 mA-h, the lock would supply the user with approximately 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 Selection 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 Cadmium Pros Fast/Simple charge High Number of charge/discharge cycles Economically Priced Cons Subject to memory Has a high discharge rate Battery Selection Lithium Ion Pros Better manufacturing techniques will reduce price by 50% after the year 2000. Very low self discharge High Number of charge/discharge cycles Cons Expensive NiCd Rechargeable Battery Circuit R1 110V 60Hz converted to DC source voltage Q1 PNP VcVs1 1 + - NiCd V1 + Battery RC Circuit battery depending on voltage used - + D1 DIODE S1 Power toVout PC 104 R3 R4 R2 Q2 NPN C1 1uF Value of Current Resistor Depends on Limiting Volta Battery ge “http://DesignNotes.com” Li-ion Rechargeable Battery Circuit 30V max DC Source with Current Limiter Vsource D1 DIODE V1 5V R1 Q1 PNP Vreg Vreg R2 R3 Q2 NPN C1 1uF Operational Transconductance Amplifier D2 DIODE + V2 R4 + Lithium Ion Battery - V3 0V “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 Termination Bifurcation