This is the project I did for fun. It involves an LED strip (WS2812B) controlled by Arduino. Arduino is controlled from my phone via an HC-06 bluetooth adapter using an app I developed.
Arduino is also connected to a microphone, so it picks up the sound, performs Fourier transform on it (it’s actually Hartley transform I’m doing, but these details are boring) and visualizes amplitudes of different frequency ranges in a bunch of different ways.
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