The Mic
stenza opened this issue · 2 comments
stenza commented
Could anyone get any signal out from the mic?
I tried analog and digit as well, but the mic pin has only a constant few mV.
I have only a basic multimeter...
Any idea on your side?
Thanks
frumperino commented
The mic signal is zero crossing which means it's swinging between negative
and positive voltages which is really best appreciated by looking at it
with an oscilloscope. Unfortunately you can't feed that directly into an
Arduino. Analog inputs generally don't like negative voltages. In order to
process it properly digitally you probably want to use an op-amp to amplify
the signal and shift it into an all-positive voltage range that is
compatible with your ADC pin. Then you can run a software DSP or FFT on the
signal to get spectral power. It might be simpler to hook up a MSGEQ7 but
you'll still want an op-amp to amplify the mic signal I think. Take a look
at this other project for inspiration: http://macetech.com/blog/node/140
Regds.
…On Sun, May 24, 2020 at 6:31 AM stenza ***@***.***> wrote:
Could anyone get any signal out from the mic?
I tried analog and digit as well, but the mic pin has only a constant few
mV.
*I have only a basic multimeter...*
Any idea on your side?
Thanks
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stenza commented
Now I understand why everyone uses some kind of mic rather than the inner one. Thank you, I am going for the simpler solution.
Thanks for the link, it was interesting reading