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Rat Rig Community [Unofficial]•17mo ago

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PWM fan control not working

Hello how I've been trying to figure out how to add PWM control to a fan.
Currently the fan never turns off and only seems to accelerate to a max setpoint of 40% anything higher doesn't seem to make a difference.
I've tried every step on the os.ratrig.com/docs/guides/4028 but nothing seems to make a difference.
Octopus 1.1 board
I've currently got my fan wired as such:
12v+ plugged into J56 fan 7
Ground plugged into J64 PA3
PWM plugged into J50 PA8
Fan is a AVC model DBTB0428B2G 12v 1A
Attached is the only change I've made to printer.cfg
And the ratos general pins from my config

If anyone has any idea I'd appreciate the input

Solution

The thing is:
The 4028 needs PWM signal to turn off, not turn on. Of there is no signal, the fan will be on.
Combining with enable_pin, whenever you enable the fan it gets power. Without PWN signal will always be on

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