The Development of a Low Cost and Portable Light Absorbance Measurement Device for Chemical Education

This research aims to study about developing and demonstrating the low-cost and portable light absorbance measurement device for using and learning in analytical experiments. In chemistry experiments, the concentration of solutions is important for mixing the sample or making medicines. In present, a UV-spectrophotometer is commonly used to check the absorbance of solution for investigating concentration of solution by the Beer’s law before bringing it to use in experiment. Although the UV-spectrophotometer has high quality, student’s learning doesn’t use all functions of the UV-spectrophotometer. Furthermore, the UVspectrophotometer is very expensive to buy many devices for student’s learning. To support student’s learning for the chemistry education, we develop a low-cost spectrophotometer by decreasing unnecessary functions and parts. The results show the coefficient of determination of light absorbance compared with the UV-spectrophotometer and the linear regression for calculating unknown concentration of solution. The effectiveness of the proposed device is demonstrated by experiments. Moreover, the program receiving the data from the proposed device can receive many data from many device by wireless network.