Good day all
My 40mm pla cooling fan are connected to D9 on my ramps 1.4. Sometimes during a print while my fan change rpm, I get this pwm noise. Do anybody know what can be changed in Marlin and to what to make the stupid noise go away. I have an idea that it`s someting to do with: #define SOFT_PWM_SCALE 0 or #define FAST_PWM_FAN or #define FAN_SOFT_PWM, but am not sure. While the fan are full blast the sound goes away, but anything under around 200pwm, the sound comes back.
My 40mm pla cooling fan are connected to D9 on my ramps 1.4. Sometimes during a print while my fan change rpm, I get this pwm noise. Do anybody know what can be changed in Marlin and to what to make the stupid noise go away. I have an idea that it`s someting to do with: #define SOFT_PWM_SCALE 0 or #define FAST_PWM_FAN or #define FAN_SOFT_PWM, but am not sure. While the fan are full blast the sound goes away, but anything under around 200pwm, the sound comes back.