基于Wi-Fi接入的无线传感器终端设计

Design of wireless sensor terminal based on Wi-Fi access mode

物联网系统的核心是将传感器感知终端采集的数据及时高效地传输到数据中心,同时将数据中心的控制命令下达给传感器终端.Wi-Fi是实现数据双向传输的重要方式.设计中以STM32单片机为控制器、Wi-Fi模块ESP8266为无线网络接入芯片,通过硬件电路设计及软件编程,实现了传感器终端与数据中心间数据上传及控制命令下行传输.相较于传统只能实现终端与路由器间的单跳传输模式,该系统能够实现多个节点间的组网后再实现与数据中心的交互.最后,对设计系统进行测试,结果表明设计的系统能够实现对环境参数的监测和终端与数据中心的双向通信.

The core of The Internet of Things system is to timely and efficiently transmit the data collected by the sensing terminal of sensors to the data center,At the same time to deliver control commands from the data center to sensor terminals.WI-FI is an important way for the implementation of two-way data transmission.The design,adopting STM32 MCU as the controller,and WI-FI module ESP8266 as the wireless network access chip,by means of hardware circuit design and software programming,successfully realizes the data upload and control command downlink transmission between the sensor terminal and the data center.Compared with the traditional single hop transmission mode between the terminal and the Router,the system can realize the interaction with the data center after networking among multiple nodes.Finally,the design system is tested,and the results show that the system can be applied to the monitoring of environmental parameters and is competent to perform two-way communication between the terminal and the data center.