PNP photoelectric NO Z-probe

jim8541

Hi, I'm trying to use a photo electric proximity detector as my Z-probe. The photo electric proximity detector is a PNP, normally open. When triggered it goes HIGH.I have it connected to the Z min end stop, pin 18 and have Z min hardware end stop set to false. I can't get it to work, it does not stop the extruder from moving down.Any ideas?. Here's my Z-probe config's

Thanks in advance for any help.

// #################### Z-Probing #####################

#define Z_PROBE_Z_OFFSET 0

#define Z_PROBE_Z_OFFSET_MODE 0

#define UI_BED_COATING 0

#define FEATURE_Z_PROBE true

#define Z_PROBE_BED_DISTANCE 195 //CHANGED 5 TO 196

#define Z_PROBE_PIN 18

#define Z_PROBE_PULLUP true ////////////////////////////Jim

#define Z_PROBE_ON_HIGH 0 //Jim changed to 1

#define Z_PROBE_X_OFFSET 30 //JIM

#define Z_PROBE_Y_OFFSET 10 //JIM

#define Z_PROBE_WAIT_BEFORE_TEST 0

#define Z_PROBE_SPEED 30

#define Z_PROBE_XY_SPEED 150

#define Z_PROBE_SWITCHING_DISTANCE 5 //changed to 10. This is the distance that it moves up between the 5 bed distance checks

#define Z_PROBE_REPETITIONS 3 //jim

#define Z_PROBE_HEIGHT 5 // jim CHANGED TO 5

#define Z_PROBE_START_SCRIPT ""

#define Z_PROBE_FINISHED_SCRIPT ""

#define Z_PROBE_REQUIRES_HEATING 0

#define Z_PROBE_MIN_TEMPERATURE 150

#define FEATURE_AUTOLEVEL 1

#define BED_LEVELING_METHOD 0

#define BED_CORRECTION_METHOD 0

#define BED_LEVELING_GRID_SIZE 5

#define BED_LEVELING_REPETITIONS 2

<div>// ################ Endstop configuration #####################

#define ENDSTOP_PULLUP_X_MIN false

#define ENDSTOP_X_MIN_INVERTING false

#define MIN_HARDWARE_ENDSTOP_X false

#define ENDSTOP_PULLUP_Y_MIN false

#define ENDSTOP_Y_MIN_INVERTING false

#define MIN_HARDWARE_ENDSTOP_Y false

//Z PROBE connected to Z min endstop using PIN 18

#define ENDSTOP_PULLUP_Z_MIN false //jim false to true

#define ENDSTOP_Z_MIN_INVERTING false //jim true to false, photoelectric Z probe 12-10-16

#define MIN_HARDWARE_ENDSTOP_Z false

/* Added by Jim

this setup assumes the TOP is Max for all Axis

#define ENDSTOP_PULLUP_X_MAX true

#define ENDSTOP_X_MAX_INVERTING false

#define MAX_HARDWARE_ENDSTOP_X true

#define ENDSTOP_PULLUP_Y_MAX true

#define ENDSTOP_Y_MAX_INVERTING false

#define MAX_HARDWARE_ENDSTOP_Y true

#define ENDSTOP_PULLUP_Z_MAX true //jim changed 11-19-16

#define ENDSTOP_Z_MAX_INVERTING false

#define MAX_HARDWARE_ENDSTOP_Z true

#define max_software_endstop_r true

#define min_software_endstop_x false

#define min_software_endstop_y false

#define min_software_endstop_z false //Jim

#define max_software_endstop_x false

#define max_software_endstop_y false

#define max_software_endstop_z false

#define ENDSTOP_X_BACK_MOVE 8

#define ENDSTOP_Y_BACK_MOVE 8

#define ENDSTOP_Z_BACK_MOVE 8 //ENDSTOP BACKMOVE

#define ENDSTOP_X_RETEST_REDUCTION_FACTOR 3

#define ENDSTOP_Y_RETEST_REDUCTION_FACTOR 3

#define ENDSTOP_Z_RETEST_REDUCTION_FACTOR 3

#define ENDSTOP_X_BACK_ON_HOME 1 //Jim 11-10-2016 This setting helps control home final position.

#define ENDSTOP_Y_BACK_ON_HOME 1

#define ENDSTOP_Z_BACK_ON_HOME 1

#define ALWAYS_CHECK_ENDSTOPS 1

</div>

Repetier

Use M119 to see if it functions in general before trying to probe.

You have pullup enabled - could that be stronger then your signal? For electronic switches this is normally false.

M119 must return H when triggered and L if not triggered.

jim8541

Hi, Yes M119 reports H when triggered and L if not triggered. I tried changing Pullup to false but it still does not stop when triggered. However, I used a voltmeter to check the output of the proximity detector. It outputs 3.5 volts when NOT triggered (H) and .08 volts(L) when triggered. I tried changing "Z probe on high" to 1, the M119 command reports H when not triggered and L when triggered but this change didn't help. I wonder if the 3.5 volts is not enough change for the Arduino board to see?

Thanks, Jim

MartinH

Can i ask what sensor type number is pls.

jim8541

Yes, it's a E18-D80NK, DC-5V photoelectric

MartinH

Nice looking probe, i may have to test one of these :)

according to the data sheet for the type number above, this is a normally open NPN type with a intternall pullup resistor.

Repetier

All that matters is that M119 returns the right signals. These are also used when moving down.

So question should maybe be what command does not work. I would always start with simple G30 P3 to test if probe works. If possible even with fake bed so you can test in air.