Grbl v1.1 changed the Z axis homing switch connection to a different pin, and it make a lot of Z switches inoperable. I show you how to fix it!
(It's actually not a bug, it was a intentional switch made in the Grbl software to add variable spindle speed functionality to v1.1. But dummies like me didn't bother to read the change notes and had to learn the hard way how the changes would affect them.)
