This project is for making a 32-band audio (music) frequency spectrum analyzer / visualizer using Arduino.
Project showcase by Shajeeb
There are online tone generators which can generate sine wave at audio frequencies. Try feeding those signals by connecting output of your computer / laptop .
How are you feeding audio into the Spectrum analyzer ? If the signal has all frequencies and are reasonably strong enough then different will light up. You may try adjusting bass / treble settings (if your system has) to observe the response change.
Please refer to the new images I added which shows two different ways of feeding audio input. I don't suggest to use another mic for audio pickup as the signal strength and frequency response will depend a lot on that mic.
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