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Old Jan 28, 2004, 08:44 PM
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The blade numbers go up to 11
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Sydney, Australia
Joined Aug 2002
4,478 Posts
Jozsef, I think the Mega8 running at 16 MHz would do just fine (and they're cheap and small in SMD).

The pwm freq needs to be high enough for us not to hear the motor squeel (I learnt that making the motor controllers for my cnc mill - couldn't work out why it was so noisy until I rasied the pwm freq!)

How fast do you think the rpm can change during on revolution? I'de be surprised if it was more than a few%, in which case the Fourier transform should work OK. Not sure if it's necessary, and it would definitely require it's own micro!

Stu Maxwell
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Last edited by stumax; Jan 28, 2004 at 09:49 PM.
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