4028 fan configuration (again, sorry)

Can someone help me with the configuration of my 4028 fan, I have tried every combination I can think of from the guide, https://os.ratrig.com/docs/guides/4028/

I have a 001 fan that I think was mislabeled, it was more than a year ago I bought it from RatRig, and at one point I had it running but it would not turn of when set to 0%

I have a octopus 1.1 board and was trying to connect as this picture, from the above guide.

So I have connected power (black and red) to PD15 and PWM (brown) to PA8, like it shows in the guide. The yellow cable I have cut and is not used by me.

I can get the fan to (with various combinations of code that I obviously don't understad at all):
go 100% all the time
100% when booting, and spin at 100% when it is set to 0% and when set to 100% it stops
And probably som other combinations as well but I can't get it to work as intended

I'm running RatOS 2.0.0

Connecting a 4028 fan | RatOS

4028 server fans are becoming a popular option for part cooling because of their light weight and great pressure and flow rates. In this guide we'll go over how to connect one and use it for part cooling. 4-pin fans usually aren't used in 3d printers, and many boards only provide 2-pin ports, but fear not! There's always a way.

Helge Keck•6/15/23, 11:37 AM

you need to use the enable pin feature

Helge Keck•6/15/23, 11:37 AM

all documented on the ratrig docu

Helge Keck•6/15/23, 11:37 AM

you need to connect your FAN GND to an empty heater output GND of the octopus, this is then the enable:pin

Helge Keck•6/15/23, 11:37 AM

this will cut off the power if PWM is set to 0

tmickeOP•6/15/23, 11:39 AM

Hi Helge, thank you.
But could I trouble you for a exaple code, what exatly to write in printer.cfg file cus I just dom't get it.

tmickeOP•6/15/23, 11:39 AM

example..

Helge Keck•6/15/23, 11:39 AM

https://os.ratrig.com/docs/guides/4028/#my-fan-doesnt-shut-off-at-0

Helge Keck•6/15/23, 11:39 AM

you just need to add a additional line to the fan config

Helge Keck•6/15/23, 11:40 AM

tmickeOP•6/15/23, 11:41 AM

I think I might have a condition with a lot of letters in it, but it gets me confused when showing a picture of one thing and the saying I should connect one to a heater...

Ttmicke I think I might have a condition with a lot of letters in it, but it gets me con...

Helge Keck•6/15/23, 11:42 AM

this isnt needed for all fans

Helge Keck•6/15/23, 11:42 AM

thats why it isnt in the default wiring guide

Helge Keck•6/15/23, 11:42 AM

but everything is described on the page you shared

tmickeOP•6/15/23, 11:42 AM

But that's the page I'm reffering to...

tmickeOP•6/15/23, 11:43 AM

Obviously I'm missing a whole lot..

Helge Keck•6/15/23, 11:43 AM

Helge Keck•6/15/23, 11:43 AM

read the whole page

tmickeOP•6/15/23, 11:44 AM

The two bottom blue boxes says the axact same thing?

Helge Keck•6/15/23, 11:45 AM

just connect the Fan GND to a empty heater GND, then add this pin to your fan config

Helge Keck•6/15/23, 11:45 AM

thats all

Helge Keck•6/15/23, 11:45 AM

the heater ouput is a GND switching mosfet

Helge Keck•6/15/23, 11:45 AM

in the moment you define the enable_pin, klipper handles this

tmickeOP•6/15/23, 11:46 AM

I mean no offence, but it's so easy when you know how... I don't.

tmickeOP•6/15/23, 11:46 AM

so i should not look at the picture in the guide?

Helge Keck•6/15/23, 11:46 AM

its everything described ion the lin kyou shared

Ttmicke so i should not look at the picture in the guide?

Helge Keck•6/15/23, 11:46 AM

like in the wiring guide, but you need to put the GND cable to the heater outpu GND

tmickeOP•6/15/23, 11:47 AM

Ok, I'll give it another go, thanks!

tmickeOP•6/15/23, 12:25 PM

If it can help anyone else I did what Helge said and entered this in my config:
[fan]
pin: !PA8
cycle_time: 0.01
enable_pin: PA3

Now it all works like a charm

Helge Keck•6/15/23, 12:27 PM

we are updating the documentation to make it easier visible for everyone

HHelge Keck we are updating the documentation to make it easier visible for everyone

miklschmidt•6/16/23, 12:13 AM

this is now online

Mmiklschmidt this is now online

Helge Keck•6/16/23, 12:13 AM

Nice