Unit test for SparkFun Electret Microphone Breakout (BOB-12758)

Sensors Sound & Audio
1

Hi,

I’ve acquired a SparkFun Electret Microphone Breakout (BOB-12758) and reproduced the example from the guide (https://learn.sparkfun.com/tutorials/el … kup-guide ). But I am not sure it is working properly, the detection looks quite random.

Actually what I’d like to do is to record sound signals. If I directly look at the raw signal by reading the analog input I just have a value oscillating around ~600 (in a range 0-1024 as explained in the guide).

Is there a way to quickly check that the microphone is working? I assume that it is sensitive enough to detect something if someone speaks near by.

Thanks.

2

You could wire it up with an LED like in the example (LED should light up when the threshold has been met) https://learn.sparkfun.com/tutorials/el … e-overview

3

This is what I have done but the LED is not systematically ON when I knock. That’s why I am not sure it is working well.

4

Do you have an oscilloscope? That would be the ideal way to test a part like this. You could also connect it to a pair of headphones and see if you can “hear” audio from it.

5

This is the best option I guess. I’ll try to find one. thanks