grbl/grbl

Health v2 · maintenance only

Flags: no_releases no_license

Adoption not part of the score

6267 stars · 3218 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Grbl is an open-source, embedded, high-performance g-code parser and CNC milling controller written in optimized C for AVR microcontrollers, running on a plain Arduino Uno. It provides real-time motion control with acceleration planning and look-ahead for CNC mills, laser cutters, and similar machines.

Use cases

• control a CNC milling machine with an Arduino
• parse and execute g-code on embedded hardware
• build a DIY laser cutter controller
• drive stepper motors with precise timing from a microcontroller
• add motion control to a homemade drawing machine
• replace parallel-port CNC motion control with low-cost hardware

When to choose

• you need to run CNC motion control on minimal hardware like an ATmega328 Arduino
• you want a proven, widely supported g-code controller for hobby CNC or laser projects
• you need jitter-free step pulses up to 30kHz with look-ahead acceleration planning

When to avoid

• you need active maintenance or new features - the project is discontinued since 2019
• you need modern 32-bit features, networking, or expanded I/O - consider grblHAL, FluidNC, or µCNC instead
• you need macro functions, variables, or canned cycles - Grbl expects GUIs to translate these into plain g-code

Facets

library · maturity abandoned

parser embedded interpreter robotics hardware embedded-systems embedded c iot cnc g-code motion-control arduino avr firmware cnc-controller stepper-motor laser-cutter 3d-printing automation

Member repositories

For agents

markdown · JSON · MCP: product_card(name="grbl/grbl")