LED Music Visualiser I am trying to create my own LED music visualiser for a university project but I can't seem to find anything I am looking for in terms of circuitry that I need for the project. I am using a teensy microcontroller with WS2812B LED strips. I am trying to replicate an example I came across on youtube but can't figure out what I need to do in the circuit with the tools I have available to me. I have found a frequency to voltage converter diagram which seems useful but have no idea how to set it up to send through the LED strip. I have attached below the LED visualiser I am taking inspiration from along with the link to the frequency to voltage converter diagram I want to build. Can anyone help me figure out how to create this with a Teensy microcontroller? Thanks
https://mathscinotes.files.wordpress.com/2014/03/v2f.jpg
https://www.youtube.com/watch?v=lU1GVVU9gLU
In addition to seconding the FFT approach, I'd like to point out why the F-V approach is problematic.  The circuit you linked to (and F-V circuits in general) depend on having a single-frequency input.  That is most definitely not a description of most music.  About the only thing it would work for would be solos of certain instruments that have repeating waveforms.  That rules out pianos, guitars, and all other plucked or struck string instruments (for example) since their &quot;harmonics&quot; are not true integer multiples of the fundamental during most of the note.  This means you can't extract the fundamental from the waveform to drive the F-V using any simple method.  (Or even any not-so-simple.)  And of course solo instruments have only minor parts in most music.  Yes, the guy in the YouTube got his LEDs to light up, but that doesn't mean he was visualizing the music in any but the crudest sense.