* Why use a 7 band MSGEQ7 graphic equalizer chip when you can get many times more frequency bins with software alone and on an Arduino UNO to boot? * This example combines high speed A/D conversion, ...

This way the Arduino keeps reading the different voltage levels, which are the values of the sine wave. Then an FFT is performed and the output is pushed to the matrix.

If you’ve ever wanted to make your own VU meter but were scared off by the signal process you need to study this tutorial. Hackaday Alum [Phil Burgess] developed the device using an RGB LED m… ...