Hi everyone, I am using Arduino Nano + Sound sensor to detect human heartbeat sound. And I want to make LPF for that sensor so can I get the best signal without noise. I've tried some Arduino frequency counter/meter tutorial but it doesn't work (it only show '0' on the serial monitor. All I get till now just the analog data of the value from the output pin sensor.
Can I get the frequency of the sound from the sensor using Arduino to find the cutoff frequency to my filter?