Automation Professional Combination Lock Graduation Project 15

I. Introduction. With the improvement of people's living standards, how to achieve home anti-theft this problem has become particularly prominent, the traditional mechanical lock due to its simple structure, the event of being pried is not uncommon, the electronic lock due to its high confidentiality, good flexibility of use, high security factor, by the majority of users.

When designing this project, two schemes were conceived: one was to use the single-chip microcomputer control scheme with AT89C2051 as the core; The other is a digital logic circuit control scheme composed of 74LS112 dual JK flip-flops. Considering that the principle of the single-chip microcomputer scheme is complex and the debugging is cumbersome, the latter scheme is adopted in this paper.

Second, the overall scheme design.

1. Design ideas.

A total of 9 user input keys are set, of which only 4 are valid password keys, the others are interference keys, if the interference key is pressed, the keyboard input circuit is automatically cleared, and the original password is invalid and needs to be re-entered; If the user enters the password for more than 40 seconds (under normal circumstances, the user will not exceed 40 seconds, if the user feels inconvenient, it can also be modified) the circuit will alarm for 80 seconds, if the circuit alarms three times in a row, the circuit will lock the keyboard for 5 minutes to prevent illegal operation by others.

** The microcontroller can set a password.

I have an article, I don't know if it's what you want, take my answer first.

Don't be nervous, the teacher will generally ask a few relevant questions based on what you wrote, it won't be difficult, as long as the ** is written by yourself, you don't have to worry about it.

My graduation project is also a combination lock, can you learn from your design program, paid, urgent!

4 4 keypad 8 digit digital tube electronic combination lock.

Use 4 4 to form the 0 9 number key and the confirm key.

Use an 8-bit digital tube to display the circuit prompt information, when entering the password, only "8When the number of digits of the password is entered and the confirmation key is pressed, the password entered is compared with the set password, if the password is correct, the door is opened, and the LED light-emitting diode is lit for one second as a prompt, and the "ding dong" sound is issued at the same time; If the password is incorrect, it is forbidden to enter the key for 3 seconds, and at the same time send out an alarm sound of "tick, tick"; If the key is pressed within 3 seconds, the key input will be disabled for 3 seconds and the key will be re-disabled.

The relevant information has been sent to your mailbox.

variable

judge_sh:std_logic_vector(1downto

Judgment input EDA

Curriculum design. Electronic password locks.

The information has been sent to you, oh, take a look.

Set up several ways to unlock, how to determine which way to unlock, password stored in**, fingerprint stored in**, what is the resolution of the display screen, how the display screen and single-chip microcomputer transmit data, my topic is this, this is the question I answered today, I hope it will help you.