Hi!, im trying to add a capacitive sensor to my printer, i tried many tutorials but cant make it work. tried:

1.- using an external adapter to give 12v to the sensor then divide voltage and put black wire to the signal pin of my z-min endstop. This make the red led on the sensor light up when something is near it, and gives 4.5v on output signal wire, but the command m119 says "open" always, lighted up or not.


2.-using the power supply of my printer (24v) divide it, then divide it again, again the led lights up correctly (but a with a lot more distance between object and sensor), here the output signal when led is not light up, its 2.3v, when it lights up its 4.8v. again command m119 says "open" always, lighted up or not.

so far in both cases, only the black wire is connected to the z-min endstop connections

3.- same as 2 but, taking ground wire too, not only the black one, and placing it in z-min "-" pin. It does the same as 2.

this is the sensor i use Ljc18a3-b-z/by, the board im trying to connect it is MKS Base v1.4, and the power supply on the printer only gives 24v, no 12v options

any help would be greatly appreciated.

could this be the problem and solution resistor R20? [www.youtube.com] see the 1.25 min mark

just notice you using the base and that vid refers to gen

Edited 1 time(s). Last edit at 01/14/2017 04:27AM by jinx.

MKS installed a external pull up resistors

So you have to remove the resistor and potentially disable the internal pullup in firmware also.

"I am using the MKS Gen 1.4 as the main controller which I found that the inductive sensor was not working. I need to de-solder the on-board pullup resistor R20 to make it works." thats for z min pin anyways.

From description of video [www.youtube.com]

Edited 1 time(s). Last edit at 01/14/2017 04:47AM by Dust.

2.3v may be too high to trigger a low state,
make sure you have endstop pullup turned off for the pin you are using

Yes you need to connect the ground and output of the sensor to the endstop pins

i dont find r20 in the schematics of my mks base 1.4 =(

i do have z-min pullups disabled in firmware

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prozer
i dont find r20 in the schematics of my mks base 1.4 =(

You got a schematic of the mks base 1.4 ?

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obewan

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prozer
i dont find r20 in the schematics of my mks base 1.4 =(

You got a schematic of the mks base 1.4 ?

yeah, someone in the facebook group for my printer send it to me...you see, people in the group have already mount a sensor in this same printer with the same board (we all have the same), but when i ask them if they could tell me how to connect the sensor, they just stop responding XD, so i know its possible to do it, but i dont know how =(

edit.- they just said "youtube guide is wrong", and no more haha xD

Edited 1 time(s). Last edit at 01/14/2017 04:33PM by prozer.

Hi

just passing through and saw your post .. this could be helpful too you

[www.thingiverse.com]