7040 Fan

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▉Description:

First, connect the 24V DC power supply and control the fan speed with the potentiometer knob on the driver board

 Unplug the potentiometer knob and connect the PWM control cable

 Please find an extra pin X on the printer control board, such as limit switch, etc. 5-3.3V logic voltage

connected to the blower's driver board control wire to it Red wire to pinX Black wire to GND

Change the default fan pin in the pins file (marlin) 

MARLIN:

 enable “FAN_SOFT_PWM” and set ”SOFT_PWM_SCALE”to 5

klipper：

[fan]

pin: X

hardware_pwm: False

cycle_time: 0.005

 Duetboard:

https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans

▉Testing:

https://www.youtube.com/watch?v=W8hgutyGDiQ

▉Display:

▉What's in the box: