Features

Select axis

To select the desired axis, you must use the file 'grbl/default.h'.

Assume that you want a rotary axis named A (rotates around the axis 'X')

At line 40 you will find :

/// ====> You must choose only one type, but not both <====

//#define AXIS_Q_TYPE LINEAR // false -> linear

#define AXIS_Q_TYPE ROTARY // true -> rotary

then at line 57 you find:

// rotary axis

#define AXIS_Q AXIS_A /// ==> You must choose your rotary fourth axis <==

From the line 76 you set define the common characteristics of

• stepper motors
• power interface
• pitch screw for linear axis
• ratio_table for rotary axis

Pinout

Attention : pinout is different from the official version of Grbl-1.1

In 'cpu_map.h' line 38 you find the pinout for steps :

• #define X_STEP_BIT 0 // MEGA2560 Digital Pin 22
• #define Y_STEP_BIT 2 // MEGA2560 Digital Pin 24
• #define Z_STEP_BIT 4 // MEGA2560 Digital Pin 26
• #define Q_STEP_BIT 6 // MEGA2560 Digital Pin 28

line 49 pinout for directions :

• #define X_DIRECTION_BIT 1 // MEGA2560 Digital Pin 23
• #define Y_DIRECTION_BIT 3 // MEGA2560 Digital Pin 25
• #define Z_DIRECTION_BIT 5 // MEGA2560 Digital Pin 27
• #define Q_DIRECTION_BIT 7 // MEGA2560 Digital Pin 29

line 60 pinout for disable out :

• #define STEPPERS_DISABLE_BIT 7 // MEGA2560 Digital Pin 30

line 68 pinout for limits :

• #define X_LIMIT_BIT 4 // MEGA2560 Digital Pin 10
• #define Y_LIMIT_BIT 5 // MEGA2560 Digital Pin 11
• #define Z_LIMIT_BIT 6 // MEGA2560 Digital Pin 12
• #define Q_LIMIT_BIT 7 // MEGA2560 Digital Pin 13