（1）主要任务是产生一个开锁信号，而开锁信号的形成条件是输入代码和已设置的密码相同。实现这种功能的电路构思有多种。比如：用2片8位数据锁存器或2片4位寄存器，一片存入开锁的代码，另一片存入密码，通过比较的方法判断，若二者相等，则形成开锁信号。
（2）在产生开锁信号后，要求输出声、光信号。其中音响的产生可以由开锁信号去触发一个音响电路。其中的光信号可以用开锁信号点亮LED指示灯。
（3）用按钮开关的第一个动作信号触发一个5S的定时器，若在5S内未将锁打开，则电路进入自锁状态，使之无法再打开，并由扬声器发出持续10秒的报警信号。((1) The main task is to generate a unlocking signal, and the formation condition of unlocking signal is that the input code and the set password are the same. There are many circuit ideas to realize this function. For example, if two 8-bit data latches or two 4-bit registers are used, one will store the unlocking code and the other will store the password. If they are equal, the unlocking signal will be formed.
(2) After the unlocking signal is generated, it is required to output acoustic and optical signals. The generation of sound can trigger a sound circuit by unlocking signal. The light signal can be used to turn on the LED indicator with the unlocking signal.
(3) Use the first action signal of the button switch to trigger a 5S timer. If the lock is not opened within 5S, the circuit will enter the self-locking state, so that it cannot be opened again, and the speaker will send an alarm signal lasting for 10 seconds.)