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How do fans report RPM's? - Page 2

post #11 of 20
Quote:
Originally Posted by inVain View Post

@doyll
my bad for not being to post clearly
what I'm trying to say is that what the Gelid and Akasa did was way overdid with their header and cable.
instead of stacking bunches of cables on one connector,
using the maxium of 3 cable into one female connector seems to be more appropriate (just like what akasa did on their previous flexa)

p.s
humans think, while animals bark at what they sees without even trying (to think) tongue.gif

Yes, Akasa way overdid the molex header running 5 pairs ifrom 2 pins to run a pair to each fan socket with a seperate lead from PWM signal source to each fan socket... a total of 10 braided cables from from 2 sources to 5 sockets. doh.gif Akasa's is a total FUBAR with 5 wires from each each source pin.rolleyes.gif

Gelid only run one pair of wires from molex and split those into 5pair 100mm or so from molex.. and included the PWM lead in with these pairs to fan socket. thumb.gif
Edited by doyll - 10/15/12 at 11:36am
post #12 of 20
Quote:
Originally Posted by inVain View Post

I'm not sure with both approach frown.gif
the gelid's junction seems pretty nasty to me, while I do agree the akasa's putting to much strain on the header :-/
I think it's fair enough to say that we should use header in their appropriate way, and a splitter should split channel into two ways, like this biggrin.gif

8046155956_5db51e8350_z.jpg
the extra 1 and 2 pins header are for the tach report and distributing the PWM signal biggrin.gif

Appears to be a board to hook one lead into plug socket that splits into 8 3pin socket, and me thinking we are talking about PWM.


Clearly we seem to have a breakdown in communication here.
post #13 of 20
Quote:
Originally Posted by inVain View Post

@doyll
might need to reminds you that some of the papst fans, even though they are 4 cables, they aren't meant to be controlled in PWM manners
and if you can figure out this figure, you might as well sell a better PWM + power splitter with a triple molex power thumb.gif

I don't understand why papst fans are being mentioned. Please explain.

te makes some very nice custom PWM adapters converting PWM to variable voltage for to use with normal 3pin fans for as many fans as you want.. with speed adjustment for each fan output..thumb.gif

post #14 of 20
Quote:
Originally Posted by doyll View Post

Appears to be a board to hook one lead into plug socket that splits into 8 3pin socket, and me thinking we are talking about PWM.
Clearly we seem to have a breakdown in communication here.

you should see it better.
it's a 4 4pin headers + 4 3pin headers.
and yes we are talking about PWM (funny since the OP asking bout RPM tongue.gif)

and yes, it's obvious that's something broken biggrin.gif
post #15 of 20
Quote:
Originally Posted by doyll View Post

I don't understand why papst fans are being mentioned. Please explain.
te makes some very nice custom PWM adapters converting PWM to variable voltage for to use with normal 3pin fans for as many fans as you want.. with speed adjustment for each fan output..thumb.gif



since you mention it on your previous diagram for PWM wiring (have you forgotten that already biggrin.gif)
post #16 of 20
Quote:
Originally Posted by steezebe View Post

That, ladies and gentlemen, is how you get 20% Rep/posts rating. Thanks mikeaj.

Rep is overrated.
post #17 of 20
Quote:
Originally Posted by Poisoner View Post

Rep is overrated.
Yes it is. thumb.gif
post #18 of 20
Quote:
Originally Posted by steezebe View Post

2) How can I control a fan to a specific RMP? I would like an accuracy....
And fat fingered OP to RMP. biggrin.gif
Quote:
Originally Posted by inVain View Post

since you mention it on your previous diagram for PWM wiring (have you forgotten that already biggrin.gif)

I said nothing I know of about papst fans.. unless the pin diagram image has a papst fan in it. biggrin.gif
post #19 of 20
Thread Starter 
Quote:
Originally Posted by xXSebaSXx View Post

This part is super easy... I had the same "need" as you mention, or maybe I just wanted to mess with an Arduino... So I bought an UNO R3, a bunch of resistors, capacitors, wire jumpers, etc... And then I went on a Google search for tutorials on how to read a fan's RPM via Arduino...
This is the one that I used (modified it a bit to suit my needs): http://www.thebestcasescenario.com/forum/showthread.php?p=292131#post292131
The short version of what you do is:
- Connect the RPM/Sense wire from the fan to pin 2 or 3 on the board. These pins allow for external interrupt signals. ie: on/off - 1/0 - high/low
- Disable interrupts
- Set a counter to 0
- Enable interrupts for a predetermined period of time (say 1000 miliseconds)
- Count the times the signal from pin 2 or 3 is received in that period of time
- Do some math to convert that number into something like RPM.
- Send the calculated value to something like an LCD or whatever else you have to display the RPM.
- Profit.

Awesome!

Fantastic find on the PWM Arduino controller! I'm going to play with this quite a bit; first to determine the consistency of the method, and then utilize it to maximize air-flow for a push-pull on a radiator using my determined drag induced through the rad to maximize turbulent flow-rate through the configuration with minimum dB increase. I'm an Aerospace Engineer by trade, so i'm nerding out hard-core on this.

With the Arduino controller code from above, I like the function for the PWM more than what I had wrote. My code didn't guarantee that the pulses would run on an even time-step, which would make the RPM's vary slightly more than on a consistent time-step. I'm also going to limit the voltage before pulsing to see how slow I can get the fans while maintaining air flow.

This of course, will need to wait for a weekend that I can keep free, which seems impossible these days.
Quote:
Originally Posted by Poisoner View Post

Rep is overrated.

Rep is the best Troll and spam gauge I'm aware of. IMO, if a comment isn't discussion-building or useful, it shouldn't have been said (unless it makes me lol wink.gif ). good rep just means the user has contributed to the knowledge of another member. The world could do with more people who wish to help others.
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post #20 of 20
Quote:
Originally Posted by doyll View Post

And fat fingered OP to RMP. biggrin.gif
I said nothing I know of about papst fans.. unless the pin diagram image has a papst fan in it. biggrin.gif

now, you should know tongue.gif
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