Design & Realization Of Fingerprint Door-lock System

With the development of our society, the recognition system of identification with high efficiency and reliability is becoming a great demand. The traditional means, such as key, password, cryptogram, ID card and even IC card, have fallen behind the needs of economic activity and social security. This is because that they would be forgeable, falsifiable, stolen or decodable.Fortunately, the rapid improvements of recognition and computer technologies have brought the biometric recognition technology, like recognition of fingerprint, palm, voice, iris, face, into actual use. Among these novel technologies, fingerprint recognition is superior to others. Because different people have different fingerprints and their fingerprints keep unchanged all the life, fingerprint recognition is undoubtedly accurate and reliable. In addition, as many up-to-date algorithms for fingerprint recognition are very fast and accurate, they can be definitely commercialized.Our system is a high-tech product with advanced fingerprint recognition algorithms. Its advantages are reliable, easy to operate, multifunctional, easy to update and low cost. These advantages make it available in all places where identification is required.This paper includes four chapters. Chapter one describes the applications, keytechnologies and innovations used and advantages of our system. Chapter two addresses in details systematic design and related modules of stand-alone door-lock system. The modules include MCU, recognition module, power, LCD, guide voice, I/O decoding circuit, RTC, unlock circuit, power save and anti-interference design. Chapter three presents a door-lock network based on RS-485 protocol. It is focused on design and program of communication protocol, determination of criteria for selection of interface chip and resolutions of problems related to network construction. The last Chapter states another advanced door-lock network. It mainly states the design of real-time image acquisition card based on PCI bus and development of WINDOWS driver programs for the card.