thucnv53 / grbl

An open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on a straight Arduino

Grbl Firmware for OpenPnP

Features

• Dual Y axis
• PWM output to control an Remote Control (RC) Servo for Drag Feeder
• Support for two actuators
• Forked from GRBL_VERSION "1.1h" GRBL_VERSION_BUILD "20190830"

A Machine in Action

grblOpenPnp_lowRes.mp4

Watch the complete video at https://youtu.be/EM1xYVEcOd8

Recommended Wiring Diagram

Repurposed GCodes

Function	Command
RC Servo Power	M3 - On, M5 - Off
RC Servo Position	S30 - raise, S90 - lower
Vacuum	M8 - On, M9 - Off
LED	M7 - On, M10 - Off

GCode Driver Commands

OpenPnP Issues and Solutions recognises this firmware and auto populates GCode commands. The following is only for reference.

Setting	GCode
CONNECT_COMMAND	G21 ; Set millimeters mode G90 ; Set absolute positioning mode
HOME_COMMAND	$H;
MOVE_TO_COMMAND	G1 {X:X%.4f} {Y:Y%.4f} {Z:Z%.4f} {C:C%.4f} {FeedRate:F:%.2f}
MOVE_TO_COMPLETE_COMMAND	G4 P0; Wait for moves to complete before returning
SET_GLOBAL_OFFSETS_COMMAND	G92 {X:X%.4f} {Y:Y%.4f} {Z:Z%.4f} {C:C%.4f} ; reset coordinates_
COMMAND_CONFIRM_REGEX	^ok.*
POSITION_REPORT_REGEX	^.*(?-?\d+.\d+) (?-?\d+.\d+) (?-?\d+.\d+) (?-?\d+.\d+).*
COMMAND_ERROR_REGEX	^Crash.*

Credits

Grbl is an open-source project fueled by the free-time of our intrepid administrators and altruistic users. If you'd like to donate, all proceeds will be used to help fund supporting hardware and testing equipment. Thank you!

A fourth axis for grbl was added by Bob Beattie in 2014

It was updated to version 1.1h and made I&S compatible by Ravi Ganesh in 2021