E4.MOV

Here's with the board programmed to detect E4 (329.6Hz). I covered the LED with a small square of paper towel as a makeshift way to diffuse the light. At the end I play the same note so that it's easier to see the output color "drift" across the color wheel.

(Using the virtual piano from https://www.onlinepianist.com/virtual-piano)

quicktime - 16.61 MB - 03/20/2023 at 08:15

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G4.MOV

With the board programmed to detect G5 (392Hz), I play the adjacent (half and whole tones) to demonstrate the selectivity of the single-bin DFT filter.

(Using the virtual piano from https://www.onlinepianist.com/virtual-piano)

quicktime - 10.91 MB - 03/20/2023 at 08:15

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C3.MOV

The board programmed to detect C3 (130.8Hz), but the filter components analog portion are selected for higher octaves (there is an alternative BOM for notes below C4). As a result I had to decrease the "cutoff" amplitude in the firmware, but I include this here just as a demonstration.

quicktime - 8.79 MB - 03/20/2023 at 08:15

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