ABSTRACT:
The electrical product have been used widely in people’s life with the continuative development of electronic technology.As well-know to all,the coffer is the usual commodity of people’s life.The traditional coffer is operated operation.The modern coffer is operated in the fixed digital keyboard ,and even by wireless controller.
The thesis introduces a kind of system applying AT89C51 as the main controller.It can fufils the following functions of electrical cipper lock:wirless control,switch and alarm.According to the practical demands,the system design has a alarming system,a switch of coffer door,a aireless controller,and two group of revisable code (authorized code and common code).
The control section applies AT89C51, made in INTEL,one kind of CMOS coding chip—PT2262 and encoding chip__PT2272, (made by PUCHENG of Taiwan),and AT24C02(made by ATMEL).The AT24C02 chip is yypical series E2PROM chip,which has a capacity of 2KB.The chip is used in the system as the saving unit of two groups of code.The unique of AT24C02 is to save information in case of interruption of power supply. The PT2262 and PT2272 is a pair of coding and encoding chips,which has twelve bits(A0-A11) adress space.The arbitrary combination can be used as the adress code of 533441,which makes the system more safer.
The working principle of the system is to campare the code inout from fixed keyboard or from the wireless control with the saved code in the E2PROM.If the result is right,you can open the lock;Or else,the system willgive a alarm.
KEY WORDS:the corder,the wirelesslaunch single-chip, microcompter.