Design Of Welding Parameters Wireless Acquisition And Transmission System Based On STM32 And WiFi Technology

In the welding production,whether welding data can be effectively collected and monitored in real time has become the key to restricting its transformation to intelligent transformation.At present,there are two main types of welding parameter monitoring systems for welding workshops at home and abroad: wired and wireless data transmission methods and more monitoring systems that have been published have adopted wired data transmission.However,due to the complicated working environment of the welding workshop,especially the popularization of the flexible welding production line,wired transmission monitoring system has many problems in practical applications.With the maturity of wireless communication technology in recent years,its anti-interference ability has been strengthened,wireless transmission Type monitoring systems are being used more and more widely.Compared with other wireless communication,WiFi technology has faster network transmission speed and higher stability.Therefore,this paper proposes to design the welding parameter wireless acquisition and transmission system with STM32 and wireless WiFi technology as the core.Based on large numbers of literature reading,this paper compared the advantages and disadvantages of wired and wireless communication methods which commonly used in the research and development of monitoring systems at home and abroad,then selects the WiFi technology with fast transmission speed and simple network configuration to construct the system communication network.The lower part of system adopted the embedded acquisition board with STM32 as the core to perform real-time acquisition and A/D conversion on the four parameters of current,voltage,gas flow and wire feeding speed.After the converted data been packaged,sent it to the sending area to wait for the wireless WiFi module to acquire.The system selected ESP8266 EX chip to communicate with STM32 through UART serial port,selects ALK8266 WiFi module developed based on ESP8266 EX chip to communicate with STM32 through SPI communication interface,then compared and analyzed two communication modes to determine the communication mode of WiFi module.Data transmission network is composed of a wireless WiFi network combined with Ethernet,the welding parameter acquisition board is added as a station STA to the basicnetwork which created by wireless router(access point AP)to form a wireless network.Data transferred to Ethernet communication via the wireless router and finally transmitted to the upper computer monitoring platform.In order to ensure the efficiency and stability of the entire network data transmission,following step been adopted to realize the sequential transmission of the data packets of the lower computer: the upper computer periodically sends the counter signal to the lower computer,at the same time sent the transmission timing of the lower computer.Based on LabVIEW software developed the host computer monitoring platform to receive,process and store the collected welding parameter data.The system debugging shows that the welding parameter monitoring system designed and manufactured by SPI communication mode has achieved the expected function and can meet the data monitoring of the welding workshop equipment.