I have a project in which i will have to show heart beat in bits per minute. I am using a microphone to get the periodic signal of my heartbeat. But I am unable to convert the signal into frequncy domain. I dont understand the code. Can anyone urgently help me? Please?
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Have a look at any Arduino heartbeat project online. None of them use FFT. Unless you have unusual requirements i expect that you don't need FFT.
Also, the problem is in the code you didn't post.