Dear all,
I’m reading from a microphone module. In fact, I tried two different ones, one from M5stack and one very common standard module.
Now I observe an extremely low sensitivity of both devices. I changed the attenuation from auto to 11db, without any improvement.
The image below shows a plot of the M5 mic. I placed it in a silent room and then started to make continuous buzzing noise, even extremely close to the mic. As you can see in the plot, there is only a difference of 5-10 discrete ADC steps from silence to very loud.
Is this the expected behavior? I observe it for both mics, so I assume it is not a hardware defect. I saw pictures like this from here, and it looks like I even have the identical microphone module (KY-038). But this is completely different from my very noisy plot.
Thanks a lot!
