Arduino with Mic and Pre Amplifier for FFT

Using Arduino Audio
1

Hi

I am planning to perform FFT on the audio obtained from the MIC connected to the Arduino UNO using the FFT library

Could you pls illustrate the connections

2

Assuming you've got the mic & preamp already, you simply need to [u]bias the input[/u] with two equal-value resistors and a capacitor. That will allow the Arduino to read the negative half of the AC audio waveform.

With the input biased at 2.5V, your signal can have peaks between -2.5V and +2.5V and that's about right for a preamp output (a line level audio signal), depending on the preamp gain and "volume" of the signal.

If you don't already have the mic & preamp, the [u]SparkFun Microphone Breakout Board[/u] is the easiest way to go. Or, copy that circuit. It has the power for an electret mic and it has the 2.5V biased output. (The SparkFun board does not have a gain control.)

3

Thanks !!

I have the Pre-amp and Hydrophone (underwater Mic) ready
From where do I download the FFT library?

4

Google will tell you.

5

Hi

This is my Mic-Pre Amp setup

Is there a sample arduino code for getting FFT data

Hydrophone - PreAmp.png
Hydrophone - PreAmp.png1350×390 95.8 KB