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How to read frequency from a noisy/irregular signal?

I have a group project in which we have to take in a noisy eeg signal from a patient and use it to control some LEDs. i am having trouble calculating the frequency of this signal as is it is very irregular and the FFT cannot plot any sort of frequency spectrum. The inbuilt frequency detectors in LabVIEW (Extract Single Tone Information etc.) also have this same problem, I have tried all of them.

 

I was wondering if maybe I had made an error with the creation of the waveform.

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It looks like the waveform you're generating only contains a single data point. The waveform chart will show you a more complete waveform because it's got it's own built-in history.

 

Try use some of the point-by-point signal processing VIs (under the Signal Processing -> Point By Point palette) to handle processing point-by-point FFTs.




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