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Data acquisition system (DAQ) plays an important role in research activities. Commercially available DAQ can be expensive and most are PC based and can be overly equipped for the task at hand. This paper proposes a low cost and mobile DAQ system with a dsPIC30 microcontroller form Microchip and program using Lubin Kerhuel Blockset for MATLAB/Simulink. An experimental rig consisting of a Maxon motor equipped with an Escon motor driver connected to a dsPIC30F3014 microcontroller was developed to demonstrate the potential of the proposed system. AFC was used as the control system and result from the experimental setup was presented in MATLAB/Simulink. Results clearly imply the viability of the proposed setup.

A spectral liquid signature analyzer system including a miniature fiber-optic spectrometer is described in this paper. Through the combination of the spectral method and liquid signature analysis technology, the analytical function of the liquid signature analyzer will be improved obviously. With this spectral liquid signature analyzer system, the physical, chemical, and mechanical characteristics of the tested sample can be obtained at the same time. In detail, that is the light intensity signal, the equivalent drop volume signal, and the spectroscopic data from the miniature spectrometer. And after merging the information data, the three-dimensional fingerprint that is unique to the liquid sample is attainable. This three-dimensional fingerprint includes the full information we gain from the experiment, and it provides visualized differences in various samples. The application of spectral analysis makes it possible for further research into the chemical compositions of liquid samples and supplies discrimination evidence to different liquids. Therefore, the liquid signature analyzer can be used in more fields related to liquid.

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