How to permanently move PART COOLING FAN to pin 6 (MKS GE 1.4 second servo header)

Hello everyone,

I want to move the PART COOLING FAN to pin D6, and use an H-BRIDGE L9110S module to power the fan, I want this also when I configured Marlin with a single EXTRUDER, because I wired already all the cables and for easy swap of the printers head, I want to use an 24 pin ATX connector, each of my heads will have the same connector and only the needed pins connected, as in the image bellow.



For this I need to have my heater pins (D10 and D7) and fan pins (D9 and D6) defined exactly in the same way no matter what version of marlin I configure (as I noticed the single heater firmware, will use E1 - D7 pin for part cooling fan, dual heaters setup, will use E1 for the secondary heater), yesterday night after a few tests I made with the dual nozzle setup, I swapped back to my single nozzle setup but this time I had defined #define FANMUX0_PIN 6, but when tried to print something I noticed the D7 mosfet was turned on instead (LED was on), I think somehow the part cooling fan is still on heater 1 connector (E1 mosfet)





Anyone around to help me with this ? Did anyone else used a similar H-BRIDGE to power fans (when using dual extruders, and all onboard mosfets are used by other devices) ? Or do you guys have any other suggestion how to power the part cooling fan (which turns on only after the first few layers).

PS. I used the L9110S H-bridge because I already had it, my plan was to an mosfet module that also has an opto-coupler onboard, but it didn't arrive yet

Edited 1 time(s). Last edit at 01/26/2019 02:30AM by ovisopa.

setting "#define FAN1_PIN 6" in configuration.h should do it...

I tend to do such modifications in the MOTHERBOARD block...

ie

#ifndef MOTHERBOARD
  #define MOTHERBOARD BOARD_MKS_GEN_13  //BOARD_RAMPS_14_EFB
  #define FAN1_PIN 6
#endif

Thank you for the quick reply, I modified the config as you suggested and flashed the firmware via OctoPrint, and made a test print, when printing the first layers the COOLING FAN must be of, and the D7 MOSFET led was off, I though the change you suggested did the trick, but ...



after it started printing the next layers I checked again the D7 MOSFET led and it was turned ON The fan connected to D6 was still OFF



In the file pins_MKS_GEN_13.h I have:

//
// Heaters / Fans
//
// Power outputs EFBF or EFBE
#define MOSFET_D_PIN 7

In configuration_adv.h I have :

#define E0_AUTO_FAN_PIN 9
#define E1_AUTO_FAN_PIN -1
#define E2_AUTO_FAN_PIN -1
#define E3_AUTO_FAN_PIN -1
#define E4_AUTO_FAN_PIN -1
#define CHAMBER_AUTO_FAN_PIN -1
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed

/**
 * Part-Cooling Fan Multiplexer
 *
 * This feature allows you to digitally multiplex the fan output.
 * The multiplexer is automatically switched at tool-change.
 * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
 */
#define FANMUX0_PIN 6
#define FANMUX1_PIN -1
#define FANMUX2_PIN -1

Those settings are the cause ?

Edited 1 time(s). Last edit at 01/26/2019 04:37AM by ovisopa.

Firstly did you check with a single hotend or dual?

secondly just noticed there is this bit of code in pins_RAMPS.h that needs changed

#elif DISABLED(IS_RAMPS_SF)                    // Not Spindle, Fan (i.e., "EFBF" or "EFBE")
  #define HEATER_BED_PIN   RAMPS_D8_PIN
  #if HOTENDS == 1
    #define FAN1_PIN       MOSFET_D_PIN
  #else
    #define HEATER_1_PIN   MOSFET_D_PIN
  #endif
#endif

with 1 hotend It will set the FAN1_PIN to MOSFET_D_PIN
but with more than 1 hotend it will set the HEATER_1_PIN to MOSFET_D_PIN
change it to

#elif DISABLED(IS_RAMPS_SF)                    // Not Spindle, Fan (i.e., "EFBF" or "EFBE")
  #define HEATER_BED_PIN   RAMPS_D8_PIN
  #define FAN1_PIN   6 
  #define HEATER_1_PIN   MOSFET_D_PIN
#endif

I dont know what #define FANMUX0_PIN 6 is for... I would set it back to -1

Edited 1 time(s). Last edit at 01/26/2019 05:36AM by Dust.

Quote
Dust
Firstly did you check with a single hotend or dual?

Today I set it up as a single hotend, last night I made some tests with dual hotends but I haven't connected the fan at all.

Quote
Dust
I dont know what #define FANMUX0_PIN 6 is for... I would set it back to -1

Now 30 minutes ago I tried setting it back to -1 but it still didn't help. I'm sure the code in the ramps file is changing the fan pin definition, I think I will try to undef FAN1_PIN either above the motherboard block you told me initially, or in my pins_MKS_GEN_13.h file, I noticed there are also some other undef's there too.

Will post back later, to let you know if it worked

Thank you!

UPDATE! It worked In the file pins_MKS_GEN_13.h I undefined FAN1 also, and redefine it one line bellow:

#include "pins_RAMPS.h"

#undef FAN_PIN
#undef FAN1_PIN

#define FAN1_PIN 6

Edited 2 time(s). Last edit at 01/26/2019 07:25AM by ovisopa.