piclist 2002\10\02\151203a >
Thread: slow sine wave freq counter
face BY : Wagner Lipnharski email (remove spam text)

Mike Singer wrote:
{Quote hidden}

Anyway, it needs to amplify the signal, since 2V / 10 bits = less than 2mV
for the pickup coil output in low speed. Applying direct the PIC ADC it
will not be enough to load the ADC at a confortable level.  At this level
the signal to noise ratio is small, what requires a differential amplify.
I really don't see the reason to apply a FFT just to recognize a rotational
magnet. Once you detect the pulse and let the comparator amplify it to the
extreme, a nice square pulse will be available to any port pin. But
everything is possible, there are crazy people all around to do all sort of
strange things, me included.

Wagner Lipnharski - UST Research Inc
Orlando FLorida - USA - http://www.ustr.net
/_/_/_/ Atmel AVR Consultant /_/_/_/

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See also: www.piclist.com/techref/method/math.htm?key=sine
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