Marlin software endstop - or how to not cross the border

[Kai Dupke]

Hi,

I updated my Marlin firmware and now have the issue that I can move an
axis off the building platform.

I min Y till it hit min endstop, then I increase Y but it will go beyond
the configured 280mm.

My idea was to have a physical min endstop and a software max endstop.

Any ideas what in the config below might be wrong? Or is the assumption
that triggering the min sets the internal counter to 0 wrong?

(removed all but Y-Axis)

> //=============================Mechanical Settings===========================
>
> // Uncomment the following line to enable CoreXY kinematics
> // #define COREXY
>
> // coarse Endstop Settings
> #define ENDSTOPPULLUPS // Comment this out (using // at the start of the line) to disable the endstop pullup resistors
>
> #ifndef ENDSTOPPULLUPS
> // fine endstop settings: Individual pullups. will be ignored if ENDSTOPPULLUPS is defined
> // #define ENDSTOPPULLUP_YMAX
> // #define ENDSTOPPULLUP_YMIN
> #endif
>
> #ifdef ENDSTOPPULLUPS
> #define ENDSTOPPULLUP_YMAX
> #define ENDSTOPPULLUP_YMIN
> #endif
>
> // The pullups are needed if you directly connect a mechanical endswitch between the signal and ground pins.
> const bool Y_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
> const bool Y_MAX_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
> //#define DISABLE_MAX_ENDSTOPS
> //#define DISABLE_MIN_ENDSTOPS
>
> // Disable max endstops for compatibility with endstop checking routine
> #if defined(COREXY) && !defined(DISABLE_MAX_ENDSTOPS)
> #define DISABLE_MAX_ENDSTOPS
> #endif
>
> // For Inverting Stepper Enable Pins (Active Low) use 0, Non Inverting (Active High) use 1
> #define Y_ENABLE_ON 0
>
> // Disables axis when it's not being used.
> #define DISABLE_Y false
>
> #define INVERT_Y_DIR false // for Mendel set to true, for Orca set to false
>
> // ENDSTOP SETTINGS:
> // Sets direction of endstops when homing; 1=MAX, -1=MIN
> #define Y_HOME_DIR -1
>
> #define min_software_endstops false // If true, axis won't move to coordinates less than HOME_POS.
> #define max_software_endstops true // If true, axis won't move to coordinates greater than the defined lengths below.
>
> // Travel limits after homing
> #define Y_MAX_POS 280
> #define Y_MIN_POS 0
>
> #define Y_MAX_LENGTH (Y_MAX_POS - Y_MIN_POS)



greetings kai

[Kai Dupke]

On 07/12/2014 12:25 PM, Kai Dupke wrote:
> Or is the assumption
> that triggering the min sets the internal counter to 0 wrong?

G28 does set the counter, just hitting the end stop during moving does
not set the zero position of the axis.

Problem solved,
greetings kai

[yu yang]

how did you solve this? i defined Y_MAX_POS 200, but the bed can go beyond 200 while x/z will stay within threshold.  Prusa I3 /Megs2560/Ramp1.4.