Spectrum Analyzer, Arduino project with FFT algorithm

The basic idea was to create color organ / spectrum analyzer on arduino board, trying to minimize quantity of external components, like analog filters, LED display drivers, etc. Spend a lot of time in search on internet I was able to find only two ! project ,  which implemented FFT in order to solve a problem. One of them is: http://elm-chan.org/works/akilcd/report_e.html in a few days it will celebrate 6-t ...

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