Grbl is a no-compromise, high performance, low cost alternative to parallel-port-based motion control for CNC milling. This version of Grbl runs on an Arduino Mega2560 only. The controller is written ...

The hardware should be familiar: an Arduino Mega and a RAMPS 1.4 board driving NEMA 17 steppers up and down extruded aluminium.

Subject: Re: [grbl] Limits & Homing on Arduino Mega 2560 running GRBL (#253) @gentlejim I think you may also need to change the limit pin numbers on Mega as cnc4fun pointed out.