(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.

Filename	Size	Update
电子密码锁.ms12	485437	2020-03-12

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