piclist 2002\10\02\151203a >
Thread: slow sine wave freq counter
www.piclist.com/techref/method/math.htm?key=sine
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face BY : Wagner Lipnharski email (remove spam text)



Mike Singer wrote:
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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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