Posts tagged ‘marlinfw’
Symptoms
CNC machine reports incorrect end stop trigger.
Relevant
Marlin 3D Printer Firmware running on Arduino Mega with RAMPS 1.4 shield. Controlled via Pronterface.
Procedure
The status of the end switches can be checked using the command M119. The procedure below explains how to check the status of the switches.
M119 and then click the Send button. The command will display the status of each of the end switches. 
Symptoms
CNC machine homes in the wrong direction.
Relevant
Marlin 3D Printer Firmware running on Arduino Mega with RAMPS 1.4 shield.
Procedure
The direction of travel when homing is configured in the configuration.h using the settings X_HOME_DIR, Y_HOME_DIR and Z_HOME_DIR in the section ENDSTOP SETTINGS.
A value of -1 will set the homing direction towards the min end stop. A value of 1 will set the homing direction to the max end stop.
In the example below the homing direction for the z axis will be changed to home towards the max end stop.
The Z home value was -1 and has been changed to 1.
