Tronxy X3 Bed auto-level with Repetier Firmware

AlphaBot

Hello,

I want to add an inductive sensor to my tronxy to have the autolevel.

I have to change what to the firmware ? ; also the home must be in the middle of the bed.

Thank you

AlphaBot

I have this : http://pdb2.turck.de/en/DE/products/000000050003f3a90001003a