I am working on a GRBL controller build using a Mega 2560 and wanted to make it easier to wire up. Additionally, I wanted to add some hardware debounce for the limit/home switches using a Schmitt Trigger and a resistor/capacitor filter circuit. Below is what I put together to test everything out. It works like a champ so, I have a couple of extra features I will be adding to the 2nd version of the below board.
Once I have this integrated, I will be finishing up my version of a SuperPID controller.
I designed a 3D printed mount for the board and Mega 2560 so I can mount it to the chassis.