How to reduce the sampling rate in Teensy?

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Lukashuk

Well-known member
Hello!
I am planning to start a new project using a geophone.
I need to investigate signals in the range of 0-200 Hz, I probably need to use an FFT and for such low frequencies it is necessary to change the sampling rate of the ADC and DAC around 1-2 KHz, then with an FFT of 1024 I can get a higher resolution between the bands.
My model buried in the ground 30-40 reacts well to human steps and a moving car at a distance of 20-30 meters
I have T3.2, T3.6 and T4.0 available.
Question: How can I reduce the number of samples per second I plan to use the Audio Library?
 
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