Homing/endstop problems

Hello everyone,

i am facing issue with my prusa i3. I have Mechanical endstops V1.2. It triggers open/close normally, as it should. (opened, when not triggered, closed, when triggered). However, when axis is homing, when endstop is pressed, axis gets no reaction at all, and it keeps hitting the endstop. What could be the issue? I am using Marlin software. Marlin code is shown below.
//===========================================================================
//=============================Mechanical Settings===========================
//===========================================================================

// 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_XMAX
// #define ENDSTOPPULLUP_YMAX
// #define ENDSTOPPULLUP_ZMAX
// #define ENDSTOPPULLUP_XMIN
// #define ENDSTOPPULLUP_YMIN
// #define ENDSTOPPULLUP_ZMIN
#endif

#ifdef ENDSTOPPULLUPS
#define ENDSTOPPULLUP_XMAX
#define ENDSTOPPULLUP_YMAX
#define ENDSTOPPULLUP_ZMAX
#define ENDSTOPPULLUP_XMIN
#define ENDSTOPPULLUP_YMIN
#define ENDSTOPPULLUP_ZMIN
#endif

// The pullups are needed if you directly connect a mechanical endswitch between the signal and ground pins.
const bool X_MIN_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
const bool Y_MIN_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
const bool Z_MIN_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
const bool X_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
const bool Y_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
//#define DISABLE_MAX_ENDSTOPS
// Deltas never have min 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 X_ENABLE_ON 0
#define Y_ENABLE_ON 0
#define Z_ENABLE_ON 0
#define E_ENABLE_ON 0 // For all extruders

// Disables axis when it's not being used.
#define DISABLE_X false
#define DISABLE_Y false
#define DISABLE_Z false
#define DISABLE_E false // For all extruders
#define DISABLE_INACTIVE_EXTRUDER true //disable only inactive extruders and keep active extruder enabled

#define INVERT_X_DIR false // DELTA does not invert
#define INVERT_Y_DIR false
#define INVERT_Z_DIR false

#define INVERT_E0_DIR false // for direct drive extruder v9 set to true, for geared extruder set to false
#define INVERT_E1_DIR false // for direct drive extruder v9 set to true, for geared extruder set to false
#define INVERT_E2_DIR false // for direct drive extruder v9 set to true, for geared extruder set to false

// ENDSTOP SETTINGS:
// Sets direction of endstops when homing; 1=MAX, -1=MIN
// deltas always home to max
#define X_HOME_DIR -1
#define Y_HOME_DIR -1
#define Z_HOME_DIR -1

#define min_software_endstops true // 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 X_MAX_POS 90
#define X_MIN_POS -90
#define Y_MAX_POS 90
#define Y_MIN_POS -90
#define Z_MAX_POS MANUAL_Z_HOME_POS
#define Z_MIN_POS 0

#define X_MAX_LENGTH (X_MAX_POS - X_MIN_POS)
#define Y_MAX_LENGTH (Y_MAX_POS - Y_MIN_POS)
#define Z_MAX_LENGTH (Z_MAX_POS - Z_MIN_POS)

The logic of the endstops are inverted.
Have you tried removing that ?

Edit the following lines
const bool X_MIN_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
const bool Y_MIN_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
const bool Z_MIN_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
to
const bool X_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
const bool Y_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
const bool Z_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.

Did you check M119's output while manually triggering the endstops? Is their state changing appropriately?
Also, check that you 've actually wired them to the min endstop pins.
I had this happen once when I wired the endstop to the max endstop pins by mistake.

Quote
mandrav
Did you check M119's output while manually triggering the endstops? Is their state changing appropriately?
Also, check that you 've actually wired them to the min endstop pins.
I had this happen once when I wired the endstop to the max endstop pins by mistake.

Yes, while cheking M119, endstop's state changes manually pressing it. And yes, they are wired to min pins.

Quote
Kafledelius
The logic of the endstops are inverted.
Have you tried removing that ?

Edit the following lines
const bool X_MIN_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
const bool Y_MIN_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
const bool Z_MIN_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.
to
const bool X_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
const bool Y_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
const bool Z_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.

When i change it to false, i get endstops triggered, while they are not pressed.

I manage to get endstops to TRIGGERED mode, when they are being pressed, but it seems that software does not react to the change from open to triggered, when endstop is being pressed

Edited 1 time(s). Last edit at 06/03/2015 07:35AM by Capinho.

I think your problem is here:

Quote

// Travel limits after homing
#define X_MAX_POS 90
#define X_MIN_POS -90
#define Y_MAX_POS 90
#define Y_MIN_POS -90
#define Z_MAX_POS MANUAL_Z_HOME_POS
#define Z_MIN_POS 0

when it hits the endstop it wants to travel another -90 mm

set it like:
// Travel limits after homing
#define X_MAX_POS 205
#define X_MIN_POS 0
#define Y_MAX_POS 205
#define Y_MIN_POS 0
#define Z_MAX_POS MANUAL_Z_HOME_POS
#define Z_MIN_POS 0