Dynamic password closed circuit access control system based on visible light communication

Abstract

The invention discloses a dynamic password closed circuit access control system based on visible light communication. The access control system comprises two parts of a door lock control system and akey unlocking system, wherein the door lock control system is composed of a visible light sequence receiving module, a visible light sequence sending module, a digital signal processing module, a first control module, a comparison module, a storage module, an unlocking driving module and a random number generation module; the key unlocking system is composed of a camera, a flash lamp and a secondcontrol module and also can be a mobile terminal with a camera and a flash lamp or a special key circuit. By means of the dynamic password closed circuit access control system, a user can flash towards a door to unlock the door through the mobile terminal or the special key; thus, convenience and quickness are achieved; meanwhile, malevolent unlocking is prevented.

Description

technical field [0001] The invention relates to a dynamic password closed-circuit access control system based on visible light communication, and belongs to the technical field of visible light communication. Background technique [0002] Visible light communication technology is a way to realize communication by controlling the driving current to make LED lights blink at high speed. It has an intuitive connection effect and a high transmission rate. When connecting at a short distance, it has strong directivity and weak penetrability. Therefore, the information is not easy to be stolen and intercepted, and the confidentiality is strong. Visible light communication system also has advantages such as low equipment cost. [0003] Traditional electronic access control systems such as NFC access control systems, fingerprint access control systems, and electronic password access control systems have the characteristics of high cost, poor security performance, easy malicious crac...

AI Technical Summary

Problems solved by technology

However, there are still the following deficiencies: 1. The password of each door is static, which increases the risk of the lock being successfully cracked maliciously; And adding a Wi-Fi module in the lock will greatly increase the cost

And the server may be attacked and the information transmitted by Wi-Fi may be maliciously intercepted

[0005] Another Chinese patent "CN104715532A" discloses a visible light access control system. Although there is an alarm system for illegal unlocking, the password is still fixed and has not fundamentally solved the problem of malicious cracking of the password.

Moreover, the patent also has the following deficiencies: 1. The "optical key module" designed in this patent uses an LED array, which increases unnecessary cost and module volume; 2. ID registration is performed between the "optical key module" and the access control lock. When data transmission such as password modification, it is necessary to connect the "optical key module" with the access control system through the data interface and data cable, and then use the touch screen on the access control system to operate

The cost of the access control system is raised, and the user is not convenient enough to use

[0006] Both of the above two patents use other communication methods other than visible light communication to transmit user information, which not only increases the cost, but also does not have much advantages in safety and convenience, and fails to make full use of the advantages of visible light communication.

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