BIGTREETECH SKR-mini-E3 motherboard is a ultra-quiet, low-power, high-quality 3D printing machine control board. It is launched by the 3D printing team of Shenzhen BIGTREE technology co., LTD. This board is specially tailored for Ender 3 printer, perfectly replacing the original Ender3 printer motherboard.
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SKR mini V3 extruder/enclosure fan cant use FAST_PWM_FAN or FAN_SOFT_PWM #768
extruder/enclosure fan cant use FAST_PWM_FAN or FAN_SOFT_PWM resulting in PWM noise with fans working like speakers.
I've been trying to use the skr mini e3 v3 to make my printer run quieter as this model has a mosfet on each fan output. I appreciate I could buy a voltage regulator and even properly 12v fans but it seems silly for anyone to have to do that.
Steps to reproduce
uncomment #define FAST_PWM_FAN
E0_AUTO_FAN_PIN PC7 for extruder
define EXTRUDER_AUTO_FAN_SPEED 150 // 255 == full speed
CONTROLLER_FAN_PIN PB15 for enclosure
define CONTROLLERFAN_SPEED_ACTIVE 150 // (0-255) Active speed, used when any motor is enabled
Expected behavior
Controlling the extruder fan using the part cooling fan socket and marlin menus is very quiet at about 58% speed with very little pwm noise. Running the extruder fan at similar speeds in the extruder fan socket should result in similar noise levels
Actual behavior
Loads of pwm noise like FAST_PWM_FAN is not enabled.
extruder/enclosure fan cant use FAST_PWM_FAN or FAN_SOFT_PWM resulting in PWM noise with fans working like speakers. I've been trying to use the skr mini e3 v3 to make my printer run quieter as this model has a mosfet on each fan output. I appreciate I could buy a voltage regulator and even properly 12v fans but it seems silly for anyone to have to do that.
Steps to reproduce
uncomment #define FAST_PWM_FAN E0_AUTO_FAN_PIN PC7 for extruder
define EXTRUDER_AUTO_FAN_SPEED 150 // 255 == full speed
CONTROLLER_FAN_PIN PB15 for enclosure
define CONTROLLERFAN_SPEED_ACTIVE 150 // (0-255) Active speed, used when any motor is enabled
Expected behavior Controlling the extruder fan using the part cooling fan socket and marlin menus is very quiet at about 58% speed with very little pwm noise. Running the extruder fan at similar speeds in the extruder fan socket should result in similar noise levels
Actual behavior Loads of pwm noise like FAST_PWM_FAN is not enabled.
Additional Information
Marlin.zip