GT2560 A + PWM fan connection and reverse direction

I have just picked up a used GeeeTech i3C pro machine .

It was not workmen great..so I stupidly though t..ah lets jsut re set it ..upgrade the firmware and start form there.
That was a bad move..

So one problem at a time.

Just wondering about the fan direction as connected to the Fan PWM pins

Repetier host connects to the the machine and I can turn fan on / off

Speed control also works

My friend that had the machine before said the fan on the extruder head worked in correct direction...blowing air across the nozzle
It is mounted as originally with the cable outwards

The fan red positive wire is connected to the pin closest to the edge of the board, I have seen it labelled as Yellow in some diagrams
Black wire to the centre pin.

No other wiring combination will power the fan.

Yes obvious quick answer is simply to unbolt the fan and put it not he other way..


But is the firmware/ Arduino sketch is there a place to reverse the PWM fan direction ?


Iam not sure what else to add

but I can ask..does any one have firmware sketch suitable for this machine ?
I can't tell you what version I have..as there desolations not seem to be a 'About' or Info screen on the printer menu.


Geeetech Technical do not respond to questions...maybe they are no longer trading ?


I am lost TBH and need help...

I have Arduino IDE 1.0.1 as that appears to be the one to sue for this machine ..

the firmware can only turn the fan on or off.

Doing so quickly it can adjust the speed.

There is no way the change the direction.

Plugging the fan in backwards will kill the fan. They are polarity sensitive.

The only option is to turn the fan around

Edited 2 time(s). Last edit at 06/18/2023 01:02PM by Dust.

Regarding firmware

Marlin has example configs for this machine [github.com]

forget about arduino ide... get vscode with platformio [marlinfw.org]

Download marlin [github.com]
extract it, replace the Configuration.h and Configuration_adv.h with the examples for that machine and build the firmware

Quote
Dust
the firmware can only turn the fan on or off.

Doing so quickly it can adjust the speed.

There is no way the change the direction.

Plugging the fan in backwards will kill the fan. They are polarity sensitive.

The only option is to turn the fan around

That is odd...the last owner insists the fan was always 'label out' that is how I received it ...I turned at around but assumed I had got it wrong in the firmware config some where..rather liek being able to change the stepper motor direction with True/ False.

Quote
Dust
Regarding firmware

Marlin has example configs for this machine [github.com]

forget about arduino ide... get vscode with platformio [marlinfw.org]

Download marlin [github.com]
extract it, replace the Configuration.h and Configuration_adv.h with the examples for that machine and build the firmware

Hey and from my quick glance at it, it looks liek it is Mac based which is good..as that is what I have here.

Thank you
I will try this VSCODE and the config files and see how I get on

Much appreciated.

Quote
Dust


Plugging the fan in backwards will kill the fan. They are polarity sensitive.

I must have got lucky !

Quote
Dust

forget about arduino ide... get vscode with platformio [marlinfw.org]

Was / is far more complex than using Ardunio IDE 1.0.1, but I did get firmware uploaded

It worked but even with the config.h from the relevant machine, it behaved weird with Repetier and home positions /calibration etc all way out.

But I successfully went back to my last old working firmware with Ardunio and all was good

I see there was a hint to go to another forum or group ( Discord I think it was called) to get advice as to which Marlin is best for my machine.

But all of that for another day.

It was a twin extruder machine GeeeTech i3 Pro C, but have never had need or use or ability for two colour models, plus the two extruders reduces build width on an already small build platform. So a Single extruder bracket next, and will set up as an i3 B Pro, which I think was the single extruder model.

Thank you for the help.