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1  Forum 2005-2010 (read only) / Development / Re: Modified 8bit FFT in c on: December 05, 2010, 07:08:21 pm
I'm currently trying to take an analog signal into my arduino in the frequency range of around 70-400 Hz with a few harmonics in each signal.  Can this FFT code be used if i wanted to find the fundamental frequency of my signals?  How would i go about doing that?  Do i need to look for the highest magnitude in the FFT bins?  I'm new to this stuff and need a little guidance.

Thanks,
2  Forum 2005-2010 (read only) / Development / Re: How to find fundamental frequency? on: November 22, 2010, 08:28:49 pm
i was thinking of trying this, a few questions though.   If instead of a sine wave, i use a guitar signal which will contain harmonics etc,  will this pulse technique still work?  Basically im looking to measure the fundamental frequency of each guitar string, and its the harmonics that are throwing me off.       Thanks,
3  Forum 2005-2010 (read only) / Development / How to find fundamental frequency? on: November 22, 2010, 04:57:38 pm
Hello,

I'm new to the Arduino and programming and am looking for some help.  I'm currently using the Arduino uno and need to find the fundamental frequency of a sine wave between around 80-340 Hz.  I plan to bias the sine wave to oscillate between .5-4.5V or so and input it into the analog input of the Arduino.  I was thinking of using zero crossings to find the fundamental frequency but am not sure how to go about doing this.  Any help or example code would be greatly appreciated.


Thanks,

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