Grbl - An embedded rs274/ngc (g-code) interpreter and motion-controller for the Arduino/AVR328 microcontroller The goal: A no-compromise, high performance, low cost alternative to parallel-port based motion control for CNC milling Status: * Ready for production, but probably rough around the edges still * Highly optimized C utilizing the hardware-timers of the AVR-chip for all critical timing * Able to maintain more than 30kHz step rate, generating an ultra clean, jitter free step-signal * G-code interpreter complete, tested with output from several CAM tools * Standards-compliant g-code arcs/circles fully supported * Buffered, non blocking, asynchronous step generation so the rest of the system is free to process g-code while the steppers are steppin' * Configuration parameters stored in EEPROM and set via simple commands * Tested on very few (two) CNC rigs Prioritized to-do: * Accelleration/decelleration * Spindle control * Autodetect baud rate * Arduino IDE compatible (build and flash) * Documentation and web-site * Support for a alphanumeric LCD readout, a joystick and a few buttons for program control * Support "headless" fabrication by buffering all code to SD-card or similar * Backlash compensation Limitations by design: * Limited GCode-support. Focus on the kind of GCode produced by CAM tools. Leave human GCoders frustrated. * No support for tool offsets (typically handled by CAM-tool) * No rotation axes, only x, y and z. The project was initially inspired by the Arduino GCode Interpreter by Mike Ellery