Okay, I have an inductive sensor mounted and wired to my ramps for the z axis (Z_MIN). If I put metal close to the sensor I see the red LED light up on the sensor, so It is getting power and working. The signal pin is connected to the signal (Z_MIN). But when I check the state of my endstops (M119), it only shows open. Both with the red led on or off. I don't know enough about pull up resistors, Would that help in Marlins? I'm not sure if I already have pull ups on or off currently in the firmware. And yes, this is a 5v inductive sensor recommended for the build. --------------------------------------------------------------------- --------------------------------------------------------------------- // coarse Endstop Settings // #define ENDSTOPPULLUPS // Comment this out (using // at the start of the line) to disable the endstop pullup resistors #if DISABLED(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 //#define ENDSTOPPULLUP_ZMIN_PROBE #endif https://reprap.org/forum/read.php?406,794659,794659#msg-794659 Sat, 13 Jun 2026 17:09:53 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?406,794659,794951#msg-794951 https://reprap.org/forum/read.php?406,794659,794951#msg-794951
I was just reading about pull up resistors. I will give it a try.]]> disneytoy Prusa i3 and variants Fri, 03 Nov 2017 21:02:31 -0400 https://reprap.org/forum/read.php?406,794659,794950#msg-794950 https://reprap.org/forum/read.php?406,794659,794950#msg-794950 Roberts_Clif Prusa i3 and variants Fri, 03 Nov 2017 20:29:58 -0400 https://reprap.org/forum/read.php?406,794659,794943#msg-794943 https://reprap.org/forum/read.php?406,794659,794943#msg-794943
The signal shows 2.85v

and when the LED is triggered 0 volts.

This is completely off the ramps, just to power and voltmeter.

Any thoughts?

My power supply reads 12.45v on the input.]]> disneytoy Prusa i3 and variants Fri, 03 Nov 2017 18:48:34 -0400 https://reprap.org/forum/read.php?406,794659,794880#msg-794880 https://reprap.org/forum/read.php?406,794659,794880#msg-794880
carefull, 12volts on the signal wire will kill the processor i/p pin if you dont protect it.

remove the // on this line to enable all pullups

// #define ENDSTOPPULLUPS // Comment this out (using // at the start of the line) to disable the endstop pullup resistors]]> obewan Prusa i3 and variants Fri, 03 Nov 2017 07:52:59 -0400 https://reprap.org/forum/read.php?406,794659,794845#msg-794845 https://reprap.org/forum/read.php?406,794659,794845#msg-794845 disneytoy Prusa i3 and variants Thu, 02 Nov 2017 19:03:31 -0400 https://reprap.org/forum/read.php?406,794659,794741#msg-794741 https://reprap.org/forum/read.php?406,794659,794741#msg-794741
With a DVM and the sensor NO, it should be +5v on the signal pin. When triggered with metal, (LED ON) it goes to zero.]]> Roberts_Clif Prusa i3 and variants Thu, 02 Nov 2017 07:22:04 -0400 https://reprap.org/forum/read.php?406,794659,794669#msg-794669 https://reprap.org/forum/read.php?406,794659,794669#msg-794669
M8 2mm sensing DC 5v Inductive Proximity Sensor NPN NO LJ8A3-2-Z/BX-5V

[www.aliexpress.com]

It was the model recommended.

Thanks

---------------------------

UPDATE:

I just used a Multimeter and with the sensor regular, it shows +2v on the signal pin. When I trigger it with metal, (LED ON) it goes to zero.

Any thoughts?

(I do believe I have PULLUP resistors turned on in Marlins.]]> disneytoy Prusa i3 and variants Wed, 01 Nov 2017 18:24:51 -0400 https://reprap.org/forum/read.php?406,794659,794664#msg-794664 https://reprap.org/forum/read.php?406,794659,794664#msg-794664 Roberts_Clif Prusa i3 and variants Wed, 01 Nov 2017 17:43:56 -0400 https://reprap.org/forum/read.php?406,794659,794659#msg-794659 https://reprap.org/forum/read.php?406,794659,794659#msg-794659
I don't know enough about pull up resistors, Would that help in Marlins? I'm not sure if I already have pull ups on or off currently in the firmware.

And yes, this is a 5v inductive sensor recommended for the build.

---------------------------------------------------------------------
---------------------------------------------------------------------

// coarse Endstop Settings
// #define ENDSTOPPULLUPS // Comment this out (using // at the start of the line) to disable the endstop pullup resistors

#if DISABLED(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
//#define ENDSTOPPULLUP_ZMIN_PROBE
#endif]]> disneytoy Prusa i3 and variants Wed, 01 Nov 2017 17:25:50 -0400