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Use software PWM for fans and heaters to minimize fan noise and support bigger fans. Also use pwm dithering to ensure the same fan speed resolution.

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Knutwurst
2022-01-24 21:14:35 +01:00
parent 425f89e924
commit d19dbf0be5
1 changed files with 3 additions and 3 deletions
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6
Marlin/Configuration.h
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@@ -3467,20 +3467,20 @@
// Use software PWM to drive the fan, as for the heaters. This uses a very low frequency
// which is not as annoying as with the hardware PWM. On the other hand, if this frequency
// is too low, you should also increment SOFT_PWM_SCALE.
//#define FAN_SOFT_PWM
#define FAN_SOFT_PWM
// Incrementing this by 1 will double the software PWM frequency,
// affecting heaters, and the fan if FAN_SOFT_PWM is enabled.
// However, control resolution will be halved for each increment;
// at zero value, there are 128 effective control positions.
// :[0,1,2,3,4,5,6,7]
#define SOFT_PWM_SCALE 0
#define SOFT_PWM_SCALE 5
// If SOFT_PWM_SCALE is set to a value higher than 0, dithering can
// be used to mitigate the associated resolution loss. If enabled,
// some of the PWM cycles are stretched so on average the desired
// duty cycle is attained.
//#define SOFT_PWM_DITHER
#define SOFT_PWM_DITHER
// Temperature status LEDs that display the hotend and bed temperature.
// If all hotends, bed temperature, and target temperature are under 54C