基于窄带物联网的智能门禁锁的设计与实现

传统机械门锁钥匙易丢失、易被复制;密码型门禁锁密钥易泄露、易遗忘;基于Wi-Fi技术的门禁锁部署受限于网络覆盖范围。针对这些问题,设计一种基于窄带物联网(narrow band internet of things,NB-IoT)的智能门禁锁。该门禁锁利用指纹信息作为身份凭据,NB-IoT技术作为通信方式。系统主要由外设、控制器、NB-IoT模块、信息邮局等模块组成,可实现指纹采集、指纹匹配、指纹删除、图像采集与传输、拜访提醒、远程开门与报警等功能。经测试,所有功能均可正常运行。最后,将该门禁锁系统分别与基于RFID技术、Wi-Fi技术、蓝牙技术的门禁锁进行对比,结果表明,基于NB-IoT技术和指纹识别技术的智能门禁锁识别迅速准确、难以被复制,具有更广的网络覆盖范围、更低的功耗和更安全可靠的身份凭据等优势。

Design and Implementation of Intelligent Entrance Guard Lock Based on NB-IoT

The key of conventional mechanical lock is easy to be lost and duplicated; the password entrance guard lock shares similar problems, like the high possibility of leaking and forgetting the password; the entrance guard lock based on Wi-Fi is limited by the scope of the network. In order to solve these problems, a smart access control lock based on the narrow-band internet of things (NB-IoT) is proposed, which uses fingerprint as the identity information, and NB-IoT technology as a communication method. The system is mainly composed of peripherals, controllers, NB-IoT modules, information post offices and other modules, which can realize the functions of fingerprint collecting, fingerprint matching, fingerprint deleting, image collecting and transmitting, visit reminding, remote door opening and alarming. The tests confirm all the effectiveness of all the functions. Finally, the access control system is compared with access control locks based on RFID technology, Wi-Fi technology, and Bluetooth technology, the findings show that the smart lock identification based on NB-IoT technology and fingerprint recognition technology is the fastest and the most accurate one, difficult to be duplicated. It enjoys the advantages of wider network coverage, less power consumption, and more secure identity information.