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Background
We can combine waves at different frequencies and amplitudes to generate complicated waves.
A Fourier transform takes a complicated looking wave and spits out the individual frequencies that it contains.
Sampling
We can sample a wave with a freqency equal to half of our sampling rate. So, if we are sampling at 10,000 Hz, we can sample wave of 5000 Hz.
Input Circuit
Sample Code
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References
| Reference | URL |
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| Arduino FFT Library | https://github.com/kosme/arduinoFFT |
| ESP32 spectrum analyser VU meter using arduinoFFT and a FastLED matrix | https://www.youtube.com/watch?v=Mgh2WblO5_c |
| ESP32_FFT_VU - Code | https://github.com/s-marley/ESP32_FFT_VU |