湖南工业大学专科毕业设计（论文）

I 摘 要 随着人们生活水平的提高，如何实现家庭防盗这一问题也变得尤其突出，传统的机械锁由于其构造简单，安全性能低，无法满足人们的需求。随着电子产品向智能化和微型化的不断发展，单片机已成为电子产品研制和开发中首选的控制器，所以具有防盗报警功能的电子密码控制系统逐渐代替传统的机械式密码控制系统，克服了机械式密码控制的密码量少，安全性能差的缺点。通过单片机编写密码程序，并用74LS47和3-8译码器74LS138驱动的数码管来显示密码。数码管可以时时显示当前输入的四位数字。当输入密码正确时，对应的指示灯亮；当密码不正确时，另一个对应的指示灯亮且并且发出声音报警-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