HELP WITH THE LIBRARY FFT

Using Arduino Audio
1

Hello world arduino

I'm in a project is to demonstrate and plot the spectral diagram of an analog signal and not to start.???? ..... =(

First of all I read about arduino Seller FFT and see that is the only option to apply, but my problem is, as I can use it and do not know how?? .... =(.

I would like some help or some examples of how to use and get the amplitude and phase of each analog signal with this program because I need to extract all the amplitudes and phases of all the harmonics existing one signal and calculate the THD.

Thank you thank you

2

A link to the library ?
What is your sketch ?

When you also post the question in another language, you could add a link to it.

3

Hi, I'm new to programming in arduino

This is the library:

https://code.google.com/p/neuroelec/downloads/detail?name=ffft_Library.zip&can=2&q=

I do not know how to use the code,

I want to acquire analog 6-channel, and the code provided below is valid for 6 analog channels:

ISR(ADC_vect)
{
** if (position >= FFT_N)
_ return;**_

** capture[position] = ADC + zero;**
** if (capture[position] == -1 || capture[position] == 1)**
** capture[position] = 0;**
** position++;**
}

also
void adcCalb(){
** Serial.println("Start to calc zero");**
** long midl = 0;**
** // get 2 meashurment at 2 sec**
** // on ADC input must be NO SIGNAL!!!**
** for (byte i = 0; i < 2; i++)**
** {**
** position = 0;**
** delay(100);**
** midl += capture[0];**
** delay(900);**
** }**
** zero = -midl/2;**
** Serial.println("Done.");**
}

And I do not understand if the prescale is activated for all analog ports, or is necessary to activate for each port.

Thanks you