Description: Hunan college graduate design (thesis) I Abstract With the improvement of people' s living standards, the issue of how to achieve home security has become particularly prominent, the traditional mechanical locks because of its simple structure, low safety performance, unable to meet people' s needs . With intelligent electronics and miniaturization to the continuous development of single-chip electronic products have become the first choice for research and development in the controller, the electronic anti-theft alarm system with password control function gradually replace the traditional mechanical control system password, overcome Mechanical password control password less, poor safety performance shortcomings. SCM program written by a password and use 74LS47 and 74LS138 3-8 decoder driven digital control to display the password. Digital display can always four digits of the current input. When you enter the correct password, the corresponding indicator light When the password
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