Threaded...

Matt Pobursky wrote:
> Most 3-wire fans use an open-collector type output for the speed pulse and
> output 2 or 4 pulses per revolution.

Good to know.

> You could just hook up your fan and measure it.

That's exactly what I was planning on doing, but if someone else has 
gone 'through the process' already, why re-invent the wheel? :-)

> I would also use a capture input if one is available as it frees up a lot
> of CPU cycles for doing other things. You'll get an elapsed time between
> pulses which can be easily converted to RPMs when you know how many pulses
> per revolution the fan provides.

Now that's the reason I posted. Great idea. I haven't messed much with 
the sampling yet.

Joe M.
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist