next topic »

[on:]

I'm having trouble figuring out how to take 16-bit FFT code work from say 0 - 400 Hz in 64 bins. The default frequency range is around 0 - 4.5KHz (1/2 the 9KHz default sample rate). Not yet sure exactly what I want for upper freq and # bins but would like to know how to use the FFT and interrupts to tailor the freq and # bins.

So a few questions...
What is the sinewave array and how does it relate to FFT size (# of bins)?
How do I use the interrupt timer to change the default 9KHz sample rate to something lower?
Is there a good tutorial that describes tailoring an FFT on the Arduino?