Python: FFT of accelerometer data without knowing the sampling rate

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I created an Android app to record accelerometer data. I have set 20 Hz as the sample rate, but in Android this is a theoretical limit because depending on the situation the device can sample with a higher frequency or, in some cases, lower. Therefore, a final recording will not have a constant sampling rate over time.

This is a window of 10s of my signal: enter image description here

How can I calculate the FFT without knowing the sample rate a priori?

sensors fft python
1 Answers

you need to at least know the total time of sampling, so you can approximate it by interval=total_time/number_of_samples.

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