A scientific research paper was found which explained step by step the procedure of making a DIY spectrophotometer with easily available material.

(Silva, W. R. F., Suarez, W. T., Reis, C., Santos, V. B. D., Carvalho, F. A., Reis, E. L., & Vicentini, F. C. (2021). Multifunctional webcam spectrophotometer for performing analytical determination and measurements of emission, absorption, and fluorescence spectra. Journal of Chemical Education, 98(4), 1442–1447. https://doi.org/10.1021/acs.jchemed.0c01085)

(Image showing basic schematics (Silva et al., 2021))

This paved the way for Spectrophotometer V2 which consisted of a webcam and a diffraction grating as stated in the paper.

(Image showing our arrangement)

Advantages:

• Small form factor
• Easy to adjust and design
• Research paper had trusted results hence could be followed to achieve required results

  

( Above image shows our first test from the webcam, showing the results on theremino on the top and showing what the camera sees on the bottom)

Problems faced:

• Light intensity is significantly reduced by slits
• Theremino is quite unwieldy
• Alignment of sensor and light source is difficult and needs to be done regularly