Nano BLE 33 sound classification

I am working on a project to classify data using sound recognition.
One of the data sets is the end sound of a washing machine and the other is noise.
However, the result is weird.
The result values for the ending sound and noise do not change.
Can you help me?

Hi @hhthhthht,

What Arduino code are you using on the Nano BLE 33? Is it the example nano_ble33_sense_microphone or nano_ble33_sense_microphone_continuous from the downloaded Arduino library?

Usually, the error you are showing points to a microphone not working properly such that it is getting the same values (e.g. all 0s) for every sample. I had the same thing happen to one of my Nano 33 BLE Sense boards–I got liquid inside the microphone MEMS hole, and it ruined the microphone. That mic now gives me all 0s regardless of the sound. If you have another Nano 33 BLE Sense, I recommend trying that.