More than 4 PWM fan 25Khz ?

Question

More than 4 PWM fan 25Khz ?

Closed this issue 2 years ago · 12 comments

Lemania commented 6 years ago

Hi
you managed to control more than 4 fan at 25khz ?

thanks
Best regards
Sébastien

Answer 1 · 2018-10-16T17:02:31.000Z

Yes. I had up to 8 fans running over PWM.

Answer 2 · 2018-10-16T21:08:30.000Z

Super !

I will look in detail and download fritzing to see your schematic

thanks to your work
Best regard
Sébastien

Answer 3 · 2018-10-17T06:32:32.000Z

Thanks for your interest in this. I do not use the fan controller anymore, so the code has gone stale. Anyway, I just pushed the latest version I was using until about half a year ago.

Answer 4 · 2018-10-17T06:50:52.000Z

Thanks, I have an nzxt grid-plus-v3 and I do not like the CAM app

I have two xeon,16 core and CAM does not allow to choose the CPU that you want, or even take a temperature average on the core or the package. So the fans fluctuates...

I also noticed that CAM was using a lot of bandwidth, and we do not know exactly which data is going through

Answer 5 · 2018-10-17T11:02:42.000Z

so you no longer use transtor in the latest version ?

how did you get 25Khz on all the out ?

in all the examples I found, it was limited by the number of timers

where do you buy your arduino clone ? Finaly it is a mini or a micro ?

thanks a lot

Answer 6 · 2018-10-18T10:19:02.000Z

Yes, I think the output buffering is unnecessary. Lemania <notifications@github.com> schrieb am Mi., 17. Okt. 2018, 13:02:

…

so you no longer use transtor in the latest version ? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#2 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAAtN6dxzt7pma7ar_simCLhGWxUNwwfks5ulw5SgaJpZM4XeUt3> .

Answer 7 · 2018-10-19T06:07:21.000Z

Interesting that CAM tends to oscillate the fan speed for you. I managed to run into oscillation with my new motherboard (X399 Taichi), too. Maybe I can still benefit from a stand-alone fan controller ...

I used this on an AMD Phenom II X6, so you will have to adapt the sensor data parsing to fit your machine.

Feel free to send me pull requests for any changes you make to the source code.

Answer 8 · 2018-10-19T06:19:31.000Z

I used an Arduino Pro Micro Clone off Aliexpress. Just like this one:

https://de.aliexpress.com/item//32860810419.html

Answer 9 · 2018-10-19T06:22:40.000Z

I used the analog outputs where possible and used a bit banging library for the rest. I remember dimly that I could make the device quite unresponsive when I tried using bit banging on all the ports for simplicity. So, this hybrid approach seems necessary, unfortunately.

Answer 10 · 2019-07-04T13:45:07.000Z

Hello, I resume the project after a break, I now have a mega32u4.

You did not answer a question, you get out 25khz on each output ?

thanks
best regards
Sébastien

Answer 11 · 2022-05-15T21:24:23.000Z

Sorry for replying only now. I just looked into that for a different reason. None of the analog outputs can provide exactly 25 kHz. However, you can configure all of the analog outputs to generate either 31250 or 7813 Hz, both of which are sufficiently close to the PWM specification for all fans I tested, at least. For details on how to do that, please refer to the source code documentation in this file:

https://github.com/AL-FC/AL-FanControl/blob/master/arduino/bridgehead2/bridgehead3_Mega_v5.0.7/bridgehead3_Mega_v5.0.7/bridgehead3_Mega_v5.0.7.ino

However, this code is specific to the ATMega2560. Please refer to the relevant datasheet of your chip for adapting this code for you.

Answer 12 · 2022-05-15T21:27:16.000Z

With that, I feel like this question is answered and actually implemented in working code for the microcontroller in the scope of this project. Therefore, I am closing this issue.