A lot of bad things can happen when a fan stops working. Prusa has had an auto fan check for years now but I am struggling to find any information on how it is done with marlin and some three pin or something fans. Thoughts?

Edited 1 time(s). Last edit at 06/17/2020 10:00AM by Power3DPrinting.

My best work around is to tag an arduino pro mini and use the third fan pin to check the fan speed and then relay that as a filament runout error to the Z-max pin. If the pro mini arduino code works, I can copy and paste it into the config or main page and pray that it compiles and runs?

Since I am in the realm of fantasy, if I can find the filament runout code then I can copy and edit it to a different pin than the runout pin and designate it to say whatever fan that is connected is dead?

... I'll use a LED, beaming through the blades onto a phototransistor - and some sort of "dead man's circuit"

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Viktor
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