Leveraging the digital visualization capabilities of the Raspberry Pi, combined with its portabilityand ease of use , the measurement scheme for grating spectrometry in university physics experiments has beenimproved.By independently writing Python programs and utilizing blue and green monochromatic light sources, the wavelengths of the visible spectrum within the field of view were determined, and the difiraction angles oflight of different wavelengths were calculated. Additionally , by connecting a home made grating spectroscope anddigital camera, the spectral distribution under different pigment concentrations was successfully displayed onthe Raspberry Pi’s sereen, During the experiment, based on the measured absorbance spectrum and pigmentconcentration data, a funetional relationship between absorbanee and pigment coneentration was fitted. ltmeasurement scheme not only enhances the accuracy and convenience of the experiment but also providesstudents with an intuitive learning platform. lt helps them to better understand and grasp the principles ofspectroscopy and its application in physics experiments.