How to get fans from the Duet 2 wifi expansion pins?
This is something I find most vexing, it seems like such a simple task at first.
Perhaps the Duex expansion boards have logic of their own that creates the new fans and feeds a signal digitally to minimize pin use.
If this is the case, then it would spell the failure of my current goal as I would have to resort to a fan splitter running the two part cooling fans in parallel, and giving the two hotend the remaining two stock conditional fan headers.
You cannot run a fan directly from the expansion header.
The DueX uses a I2C expander chip + mosfets to drive the additional fans, and a 74HCT02 chip + mosfets to drive the additional heater heater outputs.
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