Yes, I confirm the MAX/MIN pins are for the end stops (I didn't know UM2 had both, the UMO+ just uses one...)
There aren't many pins with header available on the 2.1.X boards, but you can use the following ones if they are free on the UM2 (they are on the UMO+ which shares the same board):
- Exp3 PB7 - ATmega Pin 26 - Digital pin 13
- Ext/IO PC7 - ATmega Pin 60 - Digital pin 30
- Ext/IO PD7 - ATmega Pin 50 - Digital pin 38
(The number to use in the pin.h config file is the last one, not the ATmega pin number)
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neotko 1,417
I suppose you can only use 3. Z max/min look like endstop related? Not sure (thinking out loud)
Also, the only difference afaik from z to e1 is that Z has a physical switch to set it to 1/8 ot 1/16 and by default it’s on1.8 microstepping but e1 can be set by firmware.
Maybe that other 2 of Z are related to that? I would just change the 3 that are the same and try to see what happens.
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