RAMPS 1.4 (Springter) End stops not responding

Hi all,

I'm having trouble with all my MK1.2 mechanical end stops. I soldered two wires to the COM and NC, leaving NO with no connection. However, the X, Y and Z parts dont stop at the home position when they press down on the end stops. I dont think its the endstops themselves, since its not very probable that all three of them are faulty.

Any ideas on where i should look for errors? perhaps there is some firmware settings that need to be configured?

Thanks
Salim

Are you using Pronterface?

Type in M119 and click send.

The Arduino will return the states of your EndStops.

Hi

Here's what it out[uts:

x_min:L y_min:L z_min:L

Salim

Send it with the endstops depressed and verify that the firmware is reading them.

I did that both for them depressed and pressed. same result.

Salim

What pins do you have the endstops connected to at the RAMPS end? They should be between GND and Signal, with the endstop logic inverted in firmware and the internal pullup resistors activated.

As Andrew pointed out they are sourcing inputs.

Meaning to 'activate' then pin, you need to drive the pin to ground.

It's a little counter-intuitive to some people, who are used to using a positive voltage to activate a pin.

hi. I have them connected as follows:
- the NC wired to the S on Ramps
- the COM to the (+) on RAMPS.

skhutat Wrote:
-------------------------------------------------------
> hi. I have them connected as follows:
> - the NC wired to the S on Ramps
> - the COM to the (+) on RAMPS.

That's incorrect.

Like we said these inputs require a grounding signal to activate.

You want NC wired to the S on the RAMPS.
and COM to the (-) on the RAMPS.

I am having the exact same problem as the original poster was/is having. Does anyone have any suggestions? I have tried all previous suggestions with no luck.

Tagging onto a many months dead thread is not the best way to get help. Starting a new thread with a new issue is a better idea.

Does your printer show "end stops hit" at boot up?

Do you have pull-ups enabled in your firmware?

Does your printer show "end stops hit" when you click an end stop switch manually?

Are your end stops on the pins your firmware thinks they are on?

What if pronterface doesn't says "end stop hit" but when I send him M119, it says "x_max:H y_max:L z_max:L" ?

"H" == "endstop hit"

---

Generation 7 Electronics	Teacup Firmware	RepRap DIY

If you wired them backwards (NO vs NC), you can change this in software with. There is no need to resolder them if you installed them the other way.

const bool X_ENDSTOPS_INVERTING = false; // set to true to invert the logic of the endstops.
const bool Y_ENDSTOPS_INVERTING = false; // set to true to invert the logic of the endstops.
const bool Z_ENDSTOPS_INVERTING = false; // set to true to invert the logic of the endstops.

Also, for them to work, you do need the pullups enabled for the ends that have switches on them.


// fine Enstop settings: Individual Pullups. will be ignord if ENDSTOPPULLUPS is defined
// #define ENDSTOPPULLUP_XMAX
// #define ENDSTOPPULLUP_YMAX
// #define ENDSTOPPULLUP_ZMAX
// #define ENDSTOPPULLUP_XMIN
// #define ENDSTOPPULLUP_YMIN
// #define ENDSTOPPULLUP_ZMIN

You may have to experiment a little to understand exactly how they act.

Mike