autobed level z probing issue
January 11, 2019 04:38PM
I finally got marlin working on my ramps 1.4 board correctly. My only issue now is G29 auto bed level dosnt work correctly. After homing If I use the G29 command to start the auto bed level, it will go to center of bed raise up a little and begin to go down. The probe deploys and light goes off. Issue is when the probe hits the bed it triggers and the light goes off but the Z axis does not stop and just keeping going down causing its extruder to smash in to the bed.

I have raised the z axis really high then hit "home" for Z axis, the probe will deploy and i hit it with my finger and the Led goes out but then the probe just deploys back out and continues to go down, for some reason the board is not registering the probe hitting an object, any one know the issue? I am using a 3D touch AKA a BlTouch clone.

below is a copy of my Z probe settings from my marlin configure.h folder.

//============================= Z Probe Options =============================
// @section probes

// See []

* Enable this option for a probe connected to the Z Min endstop pin.

* Enable this option for a probe connected to any pin except Z-Min.
* (By default Marlin assumes the Z-Max endstop pin.)
* To use a custom Z Probe pin, set Z_MIN_PROBE_PIN below.
* - The simplest option is to use a free endstop connector.
* - Use 5V for powered (usually inductive) sensors.
* - RAMPS 1.3/1.4 boards may use the 5V, GND, and Aux4->D32 pin:
* - For simple switches connect...
* - normally-closed switches to GND and D32.
* - normally-open switches to 5V and D32.
* WARNING: Setting the wrong pin may have unexpected and potentially
* disastrous consequences. Use with caution and do your homework.

* Probe Type
* Allen Key Probes, Servo Probes, Z-Sled Probes, FIX_MOUNTED_PROBE, etc.
* Activate one of these to use Auto Bed Leveling below.

* The "Manual Probe" provides a means to do "Auto" Bed Leveling without a probe.
* Use G29 repeatedly, adjusting the Z height at each point with movement commands
* or (with LCD_BED_LEVELING) the LCD controller.
//#define MANUAL_PROBE_START_Z 0.2

* A Fix-Mounted Probe either doesn't deploy or needs manual deployment.
* (e.g., an inductive probe or a nozzle-based probe-switch.)

* Z Servo Probe, such as an endstop switch on a rotating arm.
//#define Z_PROBE_SERVO_NR 0 // Defaults to SERVO 0 connector.
//#define Z_SERVO_ANGLES {70,0} // Z Servo Deploy and Stow angles

* The BLTouch probe uses a Hall effect sensor and emulates a servo.
#define BLTOUCH
//#define BLTOUCH_DELAY 375 // (ms) Enable and increase if needed

* Enable one or more of the following if probing seems unreliable.
* Heaters and/or fans can be disabled during probing to minimize electrical
* noise. A delay can also be added to allow noise and vibration to settle.
* These options are most useful for the BLTouch probe, but may also improve
* readings with inductive probes and piezo sensors.
//#define PROBING_HEATERS_OFF // Turn heaters off when probing
//#define WAIT_FOR_BED_HEATER // Wait for bed to heat back up between probes (to improve accuracy)
//#define PROBING_FANS_OFF // Turn fans off when probing
//#define DELAY_BEFORE_PROBING 200 // (ms) To prevent vibrations from triggering piezo sensors

// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)

// A sled-mounted probe like those designed by Charles Bell.
//#define Z_PROBE_SLED
//#define SLED_DOCKING_OFFSET 5 // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.

// For Z_PROBE_ALLEN_KEY see the Delta example configurations.

* Z Probe to nozzle (X,Y) offset, relative to (0, 0).
* X and Y offsets must be integers.
* In the following example the X and Y offsets are both positive:
* +-- BACK ---+
* | |
* L | (+) P | R <-- probe (20,20)
* E | | I
* F | (-) N (+) | G <-- nozzle (10,10)
* T | | H
* | (-) | T
* | |
* O-- FRONT --+
* (0,0)
#define X_PROBE_OFFSET_FROM_EXTRUDER 45 // X offset: -left +right [of the nozzle]
#define Y_PROBE_OFFSET_FROM_EXTRUDER 0 // Y offset: -front +behind [the nozzle]
#define Z_PROBE_OFFSET_FROM_EXTRUDER 0 // Z offset: -below +above [the nozzle]

// Certain types of probes need to stay away from edges
#define MIN_PROBE_EDGE 10

// X and Y axis travel speed (mm/m) between probes
#define XY_PROBE_SPEED 8000

// Feedrate (mm/m) for the first approach when double-probing (MULTIPLE_PROBING == 2)

// Feedrate (mm/m) for the "accurate" probe of each point

// The number of probes to perform at each point.
// Set to 2 for a fast/slow probe, using the second probe result.
// Set to 3 or more for slow probes, averaging the results.

* Z probes require clearance when deploying, stowing, and moving between
* probe points to avoid hitting the bed and other hardware.
* Servo-mounted probes require extra space for the arm to rotate.
* Inductive probes need space to keep from triggering early.
* Use these settings to specify the distance (mm) to raise the probe (or
* lower the bed). The values set here apply over and above any (negative)
* probe Z Offset set with Z_PROBE_OFFSET_FROM_EXTRUDER, M851, or the LCD.
* Only integer values >= 1 are valid here.
* Example: `M851 Z-5` with a CLEARANCE of 4 => 9mm from bed to nozzle.
* But: `M851 Z+1` with a CLEARANCE of 2 => 2mm from bed to nozzle.
#define Z_CLEARANCE_DEPLOY_PROBE 10 // Z Clearance for Deploy/Stow
#define Z_CLEARANCE_BETWEEN_PROBES 5 // Z Clearance between probe points
#define Z_CLEARANCE_MULTI_PROBE 5 // Z Clearance between multiple probes
//#define Z_AFTER_PROBING 5 // Z position after probing is done

#define Z_PROBE_LOW_POINT -2 // Farthest distance below the trigger-point to go before stopping

// For M851 give a range for adjusting the Z probe offset

// Enable the M48 repeatability test to test probe accuracy

// For Inverting Stepper Enable Pins (Active Low) use 0, Non Inverting (Active High) use 1
// :{ 0:'Low', 1:'High' }
#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 stepper immediately when it's not being used.
// WARNING: When motors turn off there is a chance of losing position accuracy!
#define DISABLE_X false
#define DISABLE_Y false
#define DISABLE_Z false
// Warn on display about possibly reduced accuracy

// @section extruder

#define DISABLE_E false // For all extruders
#define DISABLE_INACTIVE_EXTRUDER true // Keep only the active extruder enabled.

// @section machine

// Invert the stepper direction. Change (or reverse the motor connector) if an axis goes the wrong way.
#define INVERT_X_DIR false
#define INVERT_Y_DIR true
#define INVERT_Z_DIR false

// @section extruder

// For direct drive extruder v9 set to true, for geared extruder set to false.
#define INVERT_E0_DIR false
#define INVERT_E1_DIR false
#define INVERT_E2_DIR false
#define INVERT_E3_DIR false
#define INVERT_E4_DIR false

// @section homing

//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed

//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.

//#define Z_HOMING_HEIGHT 0 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.

// Direction of endstops when homing; 1=MAX, -1=MIN
// :[-1,1]
#define X_HOME_DIR -1
#define Y_HOME_DIR -1
#define Z_HOME_DIR -1

// @section machine

// The size of the print bed
#define X_BED_SIZE 200
#define Y_BED_SIZE 175

// Travel limits (mm) after homing, corresponding to endstop positions.
#define X_MIN_POS 0
#define Y_MIN_POS 0
#define Z_MIN_POS 0
#define Z_MAX_POS 150

* Software Endstops
* - Prevent moves outside the set machine bounds.
* - Individual axes can be disabled, if desired.
* - X and Y only apply to Cartesian robots.
* - Use 'M211' to set software endstops on/off or report current state

// Min software endstops constrain movement within minimum coordinate bounds

// Max software endstops constrain movement within maximum coordinate bounds

//#define SOFT_ENDSTOPS_MENU_ITEM // Enable/Disable software endstops from the LCD

* Filament Runout Sensors
* Mechanical or opto endstops are used to check for the presence of filament.
* RAMPS-based boards use SERVO3_PIN for the first runout sensor.
* For other boards you may need to define FIL_RUNOUT_PIN, FIL_RUNOUT2_PIN, etc.
* By default the firmware assumes HIGH=FILAMENT PRESENT.
#define NUM_RUNOUT_SENSORS 1 // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
#define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
#define FIL_RUNOUT_PULLUP // Use internal pullup for filament runout pins.
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