Design and implementation of security system for smart home based on IOT technology

In the world today, home security is becoming necessary nowadays as the possibilities of intrusion are increasing day by day. This design adopts the idea of "Internet of Things close to life and easy to use" as a design concept, and builds a smart home system based on the internet of things The modules included in this design include a getaway board module, a node module, and an APP module. The main functions realized are: the PC can display the temperature and humidity data collected by the node board through the browser and control the switch state of the LED Light of the control node board through the browser, and can also display the temperature and humidity data collected by the node board through an APP and control the switch state of the LED Light of the gusset plate. The communication between the PC and the node board and communication between an APP and the node board need to transfer through the gateway board, so the gateway board is the communication bridge of the whole system. In order to realize the role of the gateway board communication bridge, the design of the gateway board uses NPC's LPC1769 as the master MCU. The system builds an Ethernet service controller by the LPC1769 embedded Ethernet module and DP83848 chip. Built a gateway system with the wit 1 module, NB-IOT module and W25Q128 memory chip. The software is based on the uC/OS-II real-time operating system, equipped with uIP protocol tasks and other task modules, and built into a webserver function. (C) 2021 The Authors. Published by Elsevier B.V.