Automatic stepper calibration support

[Sebastian Möbius]

A stepper needs an input which is taken as "zero"

[Sebastian Möbius]

You can now define a button input that signals the home position.

[Javier Enrique Traid]

Excellent, very usefull, now we can use an infrared detector or use the contact betwheen he pointer and a pin in the zero position to get the zero position.