Re: square wave harmonic theory (time domain)

From: Marra <cresswellavenue@xxxxxxxxxxxx>
Date: 31 May 2007 13:11:48 -0700

I did an RPM counter for cars using an FFT.

The car drove onto a plate with a piezo in it.
The operator input the number of cylinders and the software worked out
the RPM without lifting the bonnet.

Microchip did a good apllication note on this.

www.microchip.com

.

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