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Smartphones are widely available and used extensively by students worldwide.These phones often come equipped with high-quality cameras that can be combinedwith basic optical elements to build a cost-effective DIY spectrometer. Here,we discuss a series of demonstrations and pedagogical exercises, accompanied byour DIY diffractive spectrometer that uses a free web platform for instantspectral analysis. Specifically, these demonstrations can be used to encouragehands-on and inquiry-based learning of wave optics, broadband vs discrete lightemission, quantization, Heisenberg's energy-time uncertainty relation, and theuse of spectroscopy in day-to-day life. Hence, these simple tools can bereadily deployed in high school classrooms to communicate the practices ofscience.

Modern Physics demonstrations with DIY Smartphone Spectrometers