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 with a 328p processor (Uno, Duemilanove, ...

The proprietary control of CNC machines results in the inability to control and enhance inputs because the program codes cannot be modified owing to their distribution by vendors in the compiled form.

When I compile / upload grbl 1.1e from Arduino IDE 1.8.3, I get some error messages. The upload finishes and grbl appears to work afterwards (I can send commands, and grbl responds, the response looks ...