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RaspberryPi Fan

Posted: Fri Apr 12, 2019 8:37 am
by CiZeR
Hi guys,
I am new here so I dont really know if I am in the right place.

I've RaspberryPi 3b+

I got a problem with my fan, it's a fan for RaspberryPi and when I plug the fan to the raspberry the goes 100% all the time.
Very noisy, and it's good of course that the fan is always on 100% speed, there is a way to make him be on 50%?
or just turn on when the raspberry need?

Thank you so much!

Re: RaspberryPi Fan

Posted: Fri Apr 12, 2019 8:50 am
by jahboater
Try using it without the fan!

One of the best features of the Pi3B+ is the advanced thermal management.
IMHO no fan is ever needed, regardless of the load.

A passive heat sink helps avoid throttling if your workload is extreme and sustained for more than a few minutes.

There are several cases on the market now made out of aluminum where the case itself acts as a large heat sink.

Re: RaspberryPi Fan

Posted: Fri Apr 12, 2019 8:53 am
by ShiftPlusOne
You could connect it to the 3v3 line instead of the 5v line. Alternatively, Noctua have nice quiet fans if you want to overspend on one.

Re: RaspberryPi Fan

Posted: Fri Apr 12, 2019 9:10 am
by HawaiianPi
ShiftPlusOne wrote:
Fri Apr 12, 2019 8:53 am
Alternatively, Noctua have nice quiet fans if you want to overspend on one.
Yup, Noctua fans are awesome. Not cheap, but worth the price. You definitely won't need a heatsink no matter how hard your 3B+ is pushed. I can run CPU Burn continuously on my 3B (not +) with no heatsink, cooled by a Noctua NF-A4x10 5V 40mm fan that I can barely hear (58C max).

An even better solution is to put your 3B(+) In a Flirc Gen2 case.
Image
The case itself acts as a huge heatsink and keeps the Pi cool without the additional noise or power requirements of a fan.

Re: RaspberryPi Fan

Posted: Fri Apr 12, 2019 9:32 am
by procount
With a bit of extra hardware you can control the fan speed based on the temperature.
See viewtopic.php?p=888016 as an exmaple.

Re: RaspberryPi Fan

Posted: Fri Apr 12, 2019 8:46 pm
by CiZeR
ShiftPlusOne wrote:
Fri Apr 12, 2019 8:53 am
You could connect it to the 3v3 line instead of the 5v line. Alternatively, Noctua have nice quiet fans if you want to overspend on one.
Can you explain me how to do it? where do I plug it?
procount wrote:
Fri Apr 12, 2019 9:32 am
With a bit of extra hardware you can control the fan speed based on the temperature.
See viewtopic.php?p=888016 as an exmaple.
After I am doing that the board need to stay right?

Re: RaspberryPi Fan

Posted: Sat Apr 13, 2019 1:00 am
by LTolledo
There is a "simple hack" to silence a 5v fan...

me thinks it running loose in the internet..... need to find and catch it.... :D

Re: RaspberryPi Fan

Posted: Sat Apr 13, 2019 2:27 am
by HawaiianPi
LTolledo wrote:
Sat Apr 13, 2019 1:00 am
There is a "simple hack" to silence a 5v fan...

me thinks it running loose in the internet..... need to find and catch it.... :D
Well, you could use a 12V fan on 5V. Some may not run on 5V, but the ones that do will be very quiet. I used to have a double stack cooled by a single 12V 80mm fan that made almost no noise and worked very well. It kept both systems (and the SSD on the Pi) nice and cool.

This is a shot of that configuration when I was testing it (fan on top is a 40mm Noctua, but it's not connected for the test).
Pi-Tinker_double-trouble.jpg
Pi-Tinker_double-trouble.jpg (119.6 KiB) Viewed 668 times

Re: RaspberryPi Fan

Posted: Sat Apr 13, 2019 3:27 am
by mrreality13
try this
Image

Re: RaspberryPi Fan

Posted: Sat Apr 13, 2019 4:48 am
by HawaiianPi
I thought the 3.3V output was limited. Running a fan on that seems like a bad idea.

Re: RaspberryPi Fan

Posted: Sat Apr 13, 2019 6:13 am
by LTolledo
due to the "scare" that some fans connected to the GPIO headers ([5v or 3.3v] and ground pins) "killed" some of our forum-mate's RPis, I've made it a point never to directly connect any fan (or any inductive load for that matter) to any RPi GPIO header pins.