I have always been mesmerized by lights synced to music. I had always wanted to make something that would react to music but lacked the mathematical background to understand how it to implement it.

This controls 100 WS2811 RGB LEDs for a "waterfall" spectrum analyzer. A potentiometer is used on A0 to control the sensitivity. More information, including full parts list and pictures of the final ...

A fully fledged spectrum analyzer on a basic Arduino board? It is possible when the software is tailored to the available processing power. A standard Arduino can be turned into an AC line (‘mains’) ...