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adding a cooling fan?

Posted: Fri Jul 27, 2012 12:05 am
by jehan60188
So, I've been looking at different Raspberry pi stuff, and am under the impression that it runs kind of hot.
I've got my hands on a small fan, (2.5 cm X 2.5 cm) that draws 230 milliamps and runs on 5v.
Is there a way to power the fan through the R-pi? Should I use the gpio pins? should I use another power supply?
thanks!

Re: adding a cooling fan?

Posted: Fri Jul 27, 2012 7:32 am
by khh
If you don't have anything else that uses power and have a beefy power supply of 1000 mA or more, then there should be no problem connecting a fan like that to the GPIO 5 V pins. If you have anything else that draws power, it might still work, but then it's less certain.

Re: adding a cooling fan?

Posted: Fri Jul 27, 2012 5:48 pm
by jdbennet
Its supposed to run hot. Normal operating temp is 40-60 degress, i believe.

Re: adding a cooling fan?

Posted: Fri Jul 27, 2012 6:47 pm
by computerpie
Just an FYI.
Once I shutdown I leave my fan running for a few more minutes (red led still lit on Raspi) before I power down completely (I have an on/off switch). That way the fan cools the board down more evenly during that time (about 5 to 10 more minutes).

You might look around more I found some 100 mA processor fans in my old parts box.

Good Luck.

Re: adding a cooling fan?

Posted: Fri Jul 27, 2012 7:32 pm
by tvinzant
jehan60188 wrote:So, I've been looking at different Raspberry pi stuff, and am under the impression that it runs kind of hot.
I've got my hands on a small fan, (2.5 cm X 2.5 cm) that draws 230 milliamps and runs on 5v.
Is there a way to power the fan through the R-pi? Should I use the gpio pins? should I use another power supply?
thanks!
May I recommend an alternative?
http://www.raspberrypi.org/phpBB3/viewt ... 98#p134098

Re: adding a cooling fan?

Posted: Sun Jul 29, 2012 11:17 pm
by jehan60188
thanks for all the replies, my graphics card failed recently, so I might take the heat sink off that and try something like this: http://hackaday.com/2012/06/26/adding-h ... pberry-pi/
but I'm looking for active heat dissipation options, too. I'll probably look at alternate power supplies, so I can keep the gpio pins open for other stuff.
thanks all!