Distributed Wireless Data Acquisition System Based On WiFi

In recent years,the application of data acquisition system mainly focuses on the distribution of equipment.However,the traditional cable network acquisition system has problems of wiring trouble and maintenance cost,It is not conducive to the unified management of the scattered collection nodes.Meanwhilevarious wireless network technologies,such as WiFiare flourishing and gradually applied to all aspects of social life,but its network security is lower than the traditional cable network.Therefore,how to use the widely used wireless network technology to transform the traditional wires network acquisition mode is the problem to be solved in this paper.This article takes real-time monitoring of temperature and humidity as the application target,and uses WiFi-based distributed acquisition network design as an application solution,System security and reliability are used as research standards,to enable random access to any application in the local area network through a mobile application software APP collect the temperature and humidity information of the node and perform the corresponding parameter setting and command feedback as the actual results achieved.Herein,this paper takes temperature and humidity as collection information,and studies and implements a distributed wireless data acquisition system based on WiFi.The subject's underlying acquisition node adopts STM32F103ZET6 type single-chip microcomputer to realize the collection and processing of temperature and humidity through the US ART external DHT11 temperature and humidity sensor,Through the UART external USR-WiFi232-A2 wireless AP module to achieve the underlying acquisition node and LAN connection.The upper computer application software Android APP establishes a connection with a wireless local area network through Socket sockets,and carries out the specific collection of information and the sending of instruction information.The establishment of the distributed system adopts the bottom acquisition node as the management center of the system and the TCP server program as the data processing center of the system.Finally,it analyzes the potential security risks in the normal operation of the wireless acquisition system and demonstrates the adequacy and necessity of the research system security,Based on the experiments,two specific security risks,namely disclosure of network resource usage rights and disclosure of privacy information,were proposed,Subsequently,three specific security maintenance measures were proposed:wireless AP security settings,custom data frames based on socket protocols,and data transmission encryption standards,Finally,through experiments,the effectiveness of security measures is verified and the reliability and security of the system work are improved.This system finally realizes a universal distributed parameter remote acquisition system through modular design.By appropriately cutting the software and hardware modules of this system,it can be changed to a parameter remote monitoring platform suitable for other different application scenarios.and the system is easy to install,achieves satisfactory results and has high practical value.