Arduino UNO CNC Z AXIS PROBE With GRBL Comand G38.2 on Universal G Code Sender (UGS) Easy Setup 

Instaling z probe on my homemade arduino uno based CNC. Its very simple, just connect probe wires to arduino uno ground (GND) and A5 pins. Attach probe clamp to bit and put probe underneath . Check if there is clean surface and write comand in UGS(Universal G-code Sender) g38.2 Z-10 F1 .When probe touch and got alarm set the height of the z axis according to the thickness of your probe , my probe thickness was 19.2mm so i set G92 Z19.2. and thats all.
u can buy probe here
PROBE : s.click.aliexpr...
Arduino UNO learning KIT : s.click.aliexpr...
parts from my cnc:
Arduino UNO: s.click.aliexpr...
Nema 23 stepper motor : s.click.aliexpr...
Drivers for Nema 23 TB6560 3A: s.click.aliexpr...
500w Spindle : s.click.aliexpr...
Engraving bit: s.click.aliexpr...
Linear bearings for 16mm shaft : s.click.aliexpr...