pwm frequency 500Hz

[Steph71]

Hi,

I am trying this library on my arduino nano, but I can see, that the PWM Frequency is ~500Hz.

But its supposed to be ~ 25kHz right ?

Am I missing something here ?

Best Regards
Stephan

[GiorgioAresu]

Hi, "classic" arduinos are not powerful (fast) enough to generate high frequency pwm signals, esp32 based boards are. Still, with arduinos you are generally going to get close a decent result as long as the fans are not too picky (I tried noctua fans I had around and they worked just fine), but we are talking about frequencies way out of specifications, so you cannot be sure which ones are going to work. If your project needs reliability you can try an esp32 or going straight to a pwm controller board. Theoretically you are not supposed to control and monitor pwm fans straight with/from pins without mosfets and stuff, so take this library as a quick and dirty hack Il lun 29 lug 2019, 21:18 Steph71 <[email protected]> ha scritto:

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Hi, I am trying this library on my arduino nano, but I can see, that the PWM Frequency is ~500Hz. But its supposed to be ~ 25kHz right ? Am I missing something here ? Best Regards Stephan — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#8?email_source=notifications&email_token=AAWEF2PYX5LQ4MIQOVOVOALQB47BVA5CNFSM4IHVNVVKYY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4HCD5QDA>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAWEF2IMFXMPIIE6YVE6WGTQB47BVANCNFSM4IHVNVVA> .

[Steph71]

Hi, thanks for your quick reply.

actually there are libraries which can generate the 25kHz PWM on an arduino (eventually not 6 in parallel) e.g.:

https://code.google.com/archive/p/arduino-pwm-frequency-library/
or
https://github.com/marceloaqno/4-Wire-FAN-Arduino

however, those do not include the monitoring code.

and you are right the direct coupling of the controller an the fan output might cause reliability issues.

are you aware of any of the shelf modules, that can provide spec compliant and reliable interfacing between PC fan and generic microcontrollers.

Actually I would assume, this to be a very generic components for a lot of projects ....

Best Regards
Stephan

EDIT:

Just stubled over that :

TG9541/stm8ef#38

sounds interesting will probably give it a try.

[GiorgioAresu]

Hi, I saw some of those libraries, I always assumed they would mess up timings due to changing the registries ( https://forum.arduino.cc/index.php/topic,117425.0.html) if you were to use millis and such. Never actually tried them though. Unfortunately I didn't find PWM interface modules to connect to microcontrollers, only standalone ones. Some had ways to communicate with them via serial interface IIRC, though I didn't buy one of those due to their size. I ended up with a standalone one, I'm not entirely satisfied, but it does the job. Have a nice day :) Il giorno mar 30 lug 2019 alle ore 09:51 Steph71 <[email protected]> ha scritto:

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Hi, thanks for your quick reply. actually there are libraries which can generate the 25kHz PWM on an arduino (eventually not 6 in parallel) e.g.: https://code.google.com/archive/p/arduino-pwm-frequency-library/ or https://github.com/marceloaqno/4-Wire-FAN-Arduino however, those do not include the monitoring code. and you are right the direct coupling of the controller an the fan output might cause reliability issues. are you aware of any of the shelf modules, that can provide spec compliant and reliable interfacing between PC fan and generic microcontrollers. Actually I would assume, this to be a very generic components for a lot of projects .... Best Regards Stephan — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#8?email_source=notifications&email_token=AAWEF2JUXV35N7KXPN42AITQB7XIBA5CNFSM4IHVNVVKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD3DDS2Q#issuecomment-516307306>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAWEF2NN2ECTWLYUAADE3I3QB7XIBANCNFSM4IHVNVVA> .