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Got the FFT running on the emonTX

Submitted by millertech on Fri, 03/05/2013 - 18:27

I wanted to share that I was able to get the fast fourier transform running on the emonTX. From this I built a dashboard showing the total harmonic distortion on one of the lines. I am only pulling out the 3rd and 5th harmonics but also will extract the 7th and 9th just for fun. Then I will also get my other CTs to run it as well and have a nice power quality module for the open energy monitor project.

FFT and emoncms

 

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Robert Wall's picture

Re: Got the FFT running on the emonTX

Submitted by Robert Wall on Fri, 03/05/2013 - 18:44.

I am most impressed.

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MartinR's picture

Re: Got the FFT running on the emonTX

Submitted by MartinR on Fri, 03/05/2013 - 19:09.

Yes, that's really neat - well done!

Are you going to release your code at some point? It might be interesting to use it to compare the various methods of generating the voltage signal.

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millertech's picture

Re: Got the FFT running on the emonTX

Submitted by millertech on Sat, 04/05/2013 - 22:20.

Yes I will absolutely be releasing my code once I have it a bit more cleaned up. If anyone wants it in the raw state just let me know.

I am using this library called PlainFFT and I developed an interrupt based sampler to grab the waveforms. This is defiantly pushing the limits of my Uno. Might have to get a Mega to do what I want it to do but that will be at a later time.

 

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