How to build a DIY spectrometer using just a black box with a slit, USB webcam and a CD or DVD disc (or a prism). The spectrum of the incoming light is analyzed and displayed on a computer using Theremino program, including a surprisingly good wavelength measurement.
The next episode:
https://youtu.be/4-kPvot_QsQ
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Building my circadian LED lamp:
https://youtu.be/mhbntwPr3wk
