Hi, I want to regulate the fan speed of my Noctua fans through PWM & GPIO. The fans are supplied by an external 12V power supply. I have tried to control the speed through a GPIO-out node and a slider sending a 0 - 100 PWM signal. What am I doing wrong? Are there any example flows available? I w…

I dont really know which GPIO pins I need to connect the 2 PWMs on that are not the power supply

As the others have stated we will need a wiring diagram. Do the fans have 3 or 4 wires going to them ? Do you have any external hardware (i.e.an external PWM controller as noted below) or are you trying to do this all with the native RPi components ? Craig

As others have said, we need a wiring diagram from you - just a rough sketch would help. I've quickly looked up Noctua fans and it would seem they have some circuitry built inside them. I found this whitepaper that describes Noctua's PWM specification. On the very last page is a suggested 'Driving…

Hi Dave, It's a 4-pin fan and that is my current flow. Please take a look. [{"id":"8000c717.f75478","type":"tab","label":"PWM","disabled":false,"info":""},{"id":"efcea890.a8b378","type":"ui_slider","z":"8000c717.f75478","name":"","label":"slider","tooltip":"","group":"b1d154fe.797058","order":10,"…

Hi Craig, It's a 4-pin fan and that is my current flow. Please take a look. [{"id":"8000c717.f75478","type":"tab","label":"PWM","disabled":false,"info":""},{"id":"efcea890.a8b378","type":"ui_slider","z":"8000c717.f75478","name":"","label":"slider","tooltip":"","group":"b1d154fe.797058","order":10,…

Sorry I can't import your flow. Have a look at this link that explains how to do it... [image] How to share code or flow json FAQs To share code samples or flow json in this forum, you need to take care to format it properly so that it is displayed correctly. The easiest…

And as asked a number of times please post a wiring diagram so we can see how you are hooking this all up Craig

[ { "id": "8000c717.f75478", "type": "tab", "label": "PWM", "disabled": false, "info": "" }, { "id": "efcea890.a8b378", "type": "ui_slider", "z": "8000c717.f75478", "name": "", "label": "slider", "too…

OK - managed to import your flow. [pwm_flow] On the face of it, it looks as if the flow should work, however, I don't use the GPIO pins on my RPi so I can't test it. Like Craig said, a hook-up diagram would be useful. Some things you could try... I assume you have a GND connection between the R…

I've just found an old RPi-Zero-H and connected an LED to pin 40 (GPIO-21) and GND to pin 39. Your PWM flow works fine with the LED, so you need to check some of the other things I suggested. [pwm_wiring] [my_pwm]

Node-RED

Node-RED Forum

Fan Speed Regulation PWM GPIO

General

dynamicdave 10 August 2022 07:19 14

Sorry I can't import your flow.
Have a look at this link that explains how to do it...

Topic		Replies	Views
Cabinet Temperature Controller - PWM Issue General	12	559	9 December 2020
PWM fan control over GPIO General	5	2240	27 June 2021
Temperature controlled PWM Fan General	15	4918	26 September 2018
PID Controller for Cooling - Looking for Help General	24	2827	7 July 2020
Fan RPM-Signal readout General	7	2094	19 March 2021

Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.

Fan Speed Regulation PWM GPIO

Related topics