Re:Audio Reactive LED Strips Are Diabolically Hard
by mechsy on Wednesday April 08, 2026 @03:52PM
(#47695422)
Yeah in a similar project getting line passthrough or similar to work (matching sampling frequencies etc.) to get a clean signal for the FFT proved much harder than setting up eg the ESP32 side of things. But it’s a lot of fun to play around accumulating values in the frequency buckets while trying to get the reactivity tradeoff right.
Just don’t look directly into the LEDs in a dark room, maybe that’s a bit dangerous.
I tried recreating the app (and I can connect via BT to the lights) but writing the audio-reactive code was the hardest part (and I still haven't managed to figure out a good rule of thumb or something). I mainly use it when listening to EDM or club music, so it's always a classic 4/4 110-130bpm signature, yet it's hard to have the lights react on beat.