How can I implement FFT in microcontrollers so that I can do a frequency analysis of incoming audio signals that I have sampled through the A/D converter? I am not getting just where to start, though I know mathematical techniques of FFT. I want to deploy a cool audio spectrum analyzer for my audio system using matrix LEDs.
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I googled "audio FFT for PIC libraries" and got several hits for arduino and Rpi libraries Give it a try, I think you will find what you're looking for.