Hi Guys,

It's been a while since I looked at the FFT in detail so I have a basic question.

What information do you need to plot the FFT of a signal?

Sampling frequency

How many samples (N)

What else?

I am capturing some real time ADC data through an AVR and want to plot the FFT of this signal. I know (somewhat) my sampling frequency and number of samples in one cycle of the wave. I am getting about 28 samples in one cycle of a 1Khz sine wave which means my sampling frequency is 28 ksps.

I am starting with a known sine wave input of known frequency to test my FFT and then proceed to a real life signal.

Thanks.