LEDaudio
A collection of experiments in creating sound-reactive LED strips using an FFT running on a Teensy Microcontroller
FFT Display
These displays convert the audio into the frequency domain using an FFT (Fast Fourier transform) to measure the magnitude of different frequencies within the signal and outputting them as LED brightness.
Magnitude
These displays take the volume of the left and right audio signals and display them as the magnitude of mirrored bars. The signal volume had to be smoothed in order to keep the display from responding too rapidly.