Application of virtual instrument technology in temperature acquisition system

Aimed at the present control systems using the personal computer as the control core and the rapid development of the virtual instrument technology,the design and implementation of a temperature acquisition system based on laboratory virtual instrument engineering workbench(LabVIEW) and micro control unit(MCU) was put forward to make the temperature acquisition system and the computer to achieve a high degree of integration.Virtual instrument technology was applied to the temperature acq-uisition system.The system contained the lower computer and the upper computer.The lower computer was hold by STC series MCU and DS18B20 as a temperature acquisition system,the upper computer was a personal computer with graphical programming software LabVIEW for the temperature real-time processing,analysis and storage.Many times test experiment results show that the system is running well,the experimental results are ideal.Compared with traditional temperature acquisition system only based on MCU,the design is a integrated system with computer,the application of virtual instrument technology in the system greatly improves the system sensitivity,reduces the complexity of hardware production;the application of serial communication largely reduces the cost compared with using data acquisition card to build system.The system has characteristics of simple structure,intuitive image,convenient operation,beautiful and friendly man-machine interface;and low cost,real-time data storage,strong anti-interference ability.