opajoe
Posts: 1
Joined: Mon Oct 22, 2018 4:46 pm

GPIO how to connect and control 5V 4 Pin Fan (RPM, PWM)

Mon Oct 22, 2018 5:32 pm

Hello im just start to explore the Raspberry Pi 3 world with its functions and possibilities.
I use the Raspberry Pi 3 for different purposes with different systems (Raspberrian Stretch, KODI & Retropie). I installed for the retropie Overclocking heat sinks andNoctua 5v Fan PWM https://noctua.at/en/nf-a4x10-5v-pwm?___from_store=de, that is connected to the 5v lane on the GPIO Pins 4 and 6. I realised, that the fan is really loud and its air flow is not needed for example when the raspberries stretch is running its background services (homebridge, time machine etc.).

The Fan has four pins (Ground, 5V, RPM and PWM). I read so many Forum discussions and guides how to connect 2 or 3 pin fans and control them with an external circuit. But until now i didn't found out how i really can measure the RPM of the Fan and how i Controller its speed with PWM with the GPIO connectors. The informations, that i found are contradictory and confusing. Do a need a resistor for the green PWM Cable, which Pin should i use etc. Also not clear is how to measure the RPM of the fan? Which fan should i connect the yellow cable to)?

Does anyone have experiences with that kind of cooling project? I don't want to destroy the wonderful Raspberry Pi.

Would be great if someone can help me out with informations about how to connect the fan and how to create the right code to control it with different speeds depending on the temperature of the CPU. Thanks a lot! :)

Pointlespi
Posts: 7
Joined: Sat Jun 29, 2019 7:23 am

Re: GPIO how to connect and control 5V 4 Pin Fan (RPM, PWM)

Tue Jul 02, 2019 11:12 am

Did you ever find a solution to this? Exactly the same boat

pcmanbob
Posts: 7937
Joined: Fri May 31, 2013 9:28 pm
Location: Mansfield UK

Re: GPIO how to connect and control 5V 4 Pin Fan (RPM, PWM)

Tue Jul 02, 2019 11:43 am

Pointlespi wrote:
Tue Jul 02, 2019 11:12 am
Did you ever find a solution to this? Exactly the same boat
If you had done a simple search of the forum you would have found this thread that has been active over the last few day discussing exactly the same thing.

https://www.raspberrypi.org/forums/view ... 3&t=244194
We want information… information… information........................no information no help
The use of crystal balls & mind reading are not supported

Pointlespi
Posts: 7
Joined: Sat Jun 29, 2019 7:23 am

Re: GPIO how to connect and control 5V 4 Pin Fan (RPM, PWM)

Tue Jul 02, 2019 3:30 pm

pcmanbob wrote:
Tue Jul 02, 2019 11:43 am
Pointlespi wrote:
Tue Jul 02, 2019 11:12 am
Did you ever find a solution to this? Exactly the same boat
If you had done a simple search of the forum you would have found this thread that has been active over the last few day discussing exactly the same thing.

https://www.raspberrypi.org/forums/view ... 3&t=244194
Cheers man! Love your positive attitude :)

Solved

alakani
Posts: 1
Joined: Sat Jul 27, 2019 12:22 am

Re: GPIO how to connect and control 5V 4 Pin Fan (RPM, PWM)

Sat Jul 27, 2019 12:53 am

pcmanbob wrote:
Tue Jul 02, 2019 11:43 am
Pointlespi wrote:
Tue Jul 02, 2019 11:12 am
Did you ever find a solution to this? Exactly the same boat
If you had done a simple search of the forum you would have found this thread that has been active over the last few day discussing exactly the same thing.

https://www.raspberrypi.org/forums/view ... 3&t=244194
That thread confuses me, why are they all recommending exactly what the page from the manufacturers manual from their own first post says not to do? With a simple search of the forum, you too can spend extra money on unnecessary parts that will mess up the waveform and make the fan run choppy or cut out :P

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