Abstract
Abstract ： In our daily life, the security of house, company department,
documents and finance forms, also some personal information always used the
lock to protect them. If use the normal keys to lock out the door, we should
taken many keys with ourself.That is so difficult to use. And if we lost the
keys with careless, the security looks very easy to break out.As the developing
of the technology,people
ask for high securty machines.For satisfy this request, the cipher lock is
appeared.The cipher has higher security, lower cost, lower power and easy to
use.
Base on the thinking of the cipher lock, this design uses AT89C51 of ATMEL
COMPANY to carry out the SCM digital cipher lock, its main function as
follow:
1. set password with 6 words, enter the words via keybord, if enter the right
number, the lock will unlock.
2. alarm function. If enter the wrong password, the mon will show the error
message, when enter the wrong password over 3 times, the buzzer will alarm
and lock the keybord at the same time.
this lock is made by 3 parts: gob circuit of 4x4 matrix keybord , gob circuit of
cipher lock, gob circuit of 8 way display output. other wise, the system has
LED light, and warning buzzer.
the main function of this cipher lock is carried out enter, clear, and change the
password, and unlock the door.
1. enter the password: press one number button, one signal "-" will show on
the digital tube on the right side, pls put the "-" to left side at the same time.
2. change the password: use the new enter number as the new password.
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