RAMPS 1.4 Marlin RC8 CONTROLLERFAN_PIN issue Hello, I am using Marlin 1.10 RC8 with RAMPS 1.4. Printer is custom-built Delta. Board configuration BOARD_RAMPS_14_EFB, with HEATER_BED_PIN assigned to pin 57. I plan to use D8 output for aux fans control - RAMPS and hot end coolers. In Configuration_adv.h I changed CONTROLLERFAN_PIN to 8, compilation goes fine, but then nothing happens. I assume 12V should appear at D8 pins when steppers begin to work, but it remains zero. Have I missed anything or CONTROLLERFAN_PIN can't be assigned to D8? https://reprap.org/forum/read.php?146,733540,733540#msg-733540 Thu, 10 Sep 2026 06:14:05 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?146,733540,734057#msg-734057 Re: RAMPS 1.4 Marlin RC8 CONTROLLERFAN_PIN issue https://reprap.org/forum/read.php?146,733540,734057#msg-734057 thanks for the help, problem is solved. The issue was in missing voltage at secondary power supply.]]> zakamik Firmware - mainstream and related support Fri, 30 Dec 2016 06:51:37 -0500 https://reprap.org/forum/read.php?146,733540,733915#msg-733915 Re: RAMPS 1.4 Marlin RC8 CONTROLLERFAN_PIN issue https://reprap.org/forum/read.php?146,733540,733915#msg-733915
Quote
stephenrc
D8 isn't the cpu pin number, it's the name of the pin.
As I can see on the RAMPS schematic, it is. [reprap.org]
If not, then which CPU pin D8 corresponds to?

Quote
stephenrc
I believe you need to set CONTROLLERFAN_PIN to 57 and HEATER_BED_PIN to -1, to disable or whatever pin you're using for a heated bed.
In my current configuration pin 57 controls heated bed relay. I can't use D8 output for heated bed because current is too high for RAMPS circuit. That's why I decided to use it for something useful that draws less current.
With proposed changes I won't be able to use heatbed at all.]]> zakamik Firmware - mainstream and related support Thu, 29 Dec 2016 16:00:18 -0500 https://reprap.org/forum/read.php?146,733540,733894#msg-733894 Re: RAMPS 1.4 Marlin RC8 CONTROLLERFAN_PIN issue https://reprap.org/forum/read.php?146,733540,733894#msg-733894
I believe you need to set CONTROLLERFAN_PIN to 57 and HEATER_BED_PIN to -1, to disable or whatever pin you're using for a heated bed.]]> stephenrc Firmware - mainstream and related support Thu, 29 Dec 2016 15:08:41 -0500 https://reprap.org/forum/read.php?146,733540,733598#msg-733598 Re: RAMPS 1.4 Marlin RC8 CONTROLLERFAN_PIN issue https://reprap.org/forum/read.php?146,733540,733598#msg-733598 zakamik Firmware - mainstream and related support Wed, 28 Dec 2016 14:37:35 -0500 https://reprap.org/forum/read.php?146,733540,733562#msg-733562 Re: RAMPS 1.4 Marlin RC8 CONTROLLERFAN_PIN issue https://reprap.org/forum/read.php?146,733540,733562#msg-733562 stephenrc Firmware - mainstream and related support Wed, 28 Dec 2016 12:22:38 -0500 https://reprap.org/forum/read.php?146,733540,733540#msg-733540 RAMPS 1.4 Marlin RC8 CONTROLLERFAN_PIN issue https://reprap.org/forum/read.php?146,733540,733540#msg-733540
I am using Marlin 1.10 RC8 with RAMPS 1.4. Printer is custom-built Delta. Board configuration BOARD_RAMPS_14_EFB, with HEATER_BED_PIN assigned to pin 57.
I plan to use D8 output for aux fans control - RAMPS and hot end coolers.

In Configuration_adv.h I changed CONTROLLERFAN_PIN to 8, compilation goes fine, but then nothing happens. I assume 12V should appear at D8 pins when steppers begin to work, but it remains zero.

Have I missed anything or CONTROLLERFAN_PIN can't be assigned to D8?]]> zakamik Firmware - mainstream and related support Wed, 28 Dec 2016 11:19:33 -0500