Auto zero Z axis for mach3 mill
Zeroing tools for a CNC is very common any time you need to use it. It can be done by eye but not so consistent as a electrical circuit.
I therefore build a zeroing tool able to do this. The inspiration came from the the blog post from .instructables blog where someone wrote a script for mach3mill the software we also use.
You can find the blog post here.
I added and buzzer to also give an audible feedback when a touch is sensed. This did however increase the power consumption from the GPIO’s so a transistor had to be added so the contact plate acts thought a power stage.