sanjaysp91 / grblforramps

RAMPS 1.4 fork of 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 0.9j for Arduino Mega 2560 and RAMPS 1.4

This port was initally developed by ArSi [email protected] but has been enhanced to also support Arduino Mega 2560 + RAMPS 1.4 Board (including limit switches, homing and probing support). It's based on Grbl v0.9j Atmega328p 16mhz 115200baud with generic defaults (2016-03-17).

For my home made CNC machine I have connected the limit switches as per the RAMPS 1.4 standard connection and not the grbl standard: I.e.

This is the key configuration parameters for making both limit switching and probing working on my RAMPS 1.4 CNC machine: grbl RAMPS 1.4 config parameters

#define DEFAULT_INVERT_ST_ENABLE 0 // false
#define DEFAULT_INVERT_LIMIT_PINS 0 // false
// Uses software limits in the firmware to keep the printer from going too far in the opposite direction and hardware endstops for min
#define DEFAULT_SOFT_LIMIT_ENABLE 1 // true
#define DEFAULT_HARD_LIMIT_ENABLE 1 // true
#define DEFAULT_HOMING_ENABLE 1 // true
#define DEFAULT_HOMING_DIR_MASK ((1<<X_AXIS)|(1<<Y_AXIS)|(0<<Z_AXIS)) // X and Y endstop installed to the minimum (zero point). Z max installed and Z Min used for probe

On the RAMPS board the spindle direction output pins can be found under SERVOS

• SPINDLE_ENABLE_BIT = MEGA2560 Digital Pin 6
• SPINDLE_DIRECTION_BIT = MEGA2560 Digital Pin 5

On the RAMPS board the flood and mist coolant enable output pins can be found under AUX-1

• COOLANT_FLOOD_BIT = MEGA2560 Digital Pin 0
• COOLANT_MIST_BIT = MEGA2560 Digital Pin 1

On the RAMPS board user-control CONTROLs (cycle start, reset, feed hold) input pins can be found under AUX-2

• RESET_BIT = MEGA2560 Analog Pin 9
• FEED_HOLD_BIT = MEGA2560 Analog Pin 10
• CYCLE_START_BIT = MEGA2560 Analog Pin 11
• SAFETY_DOOR_BIT = MEGA2560 Analog Pin 12

Updated to use platformio

build using the following commands

$pio run

Upload to your board using

$pio run --target upload

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Regards, Per Ivar