Problem with BL touch calibration

[andyparla]

Hi everyone;

I have followed the wiki post from Bl Touch calibration:
http://www.geeetech.com/wiki/index.php/ ... alibration

But i am not able to make it:

I write the next commands as wiki says.

M851 ; note the number
it returns: -1.4

M851 Z0 ; set the offset to zero
it returns: Offset Zz_min: -15z_max:-5

G28;
It makes autohome; it tries go to 0 Z axis (but my bed is about 5mm) but the autoleveling does not work because the nozzle touch the hot bed and it does not stop. It have to manually stop

G1 Z0
it moves the Z to 0 mm

Then as per my bed is before the -1.4 value I try to set positive number in next command:
M851 Z2.0 ; to set the offset you got in the previous step.
It returns: it returns: Offset Zz_min: -15z_max:-5

M500 ; Stores the values in EEPROM so that it is not reset when you power the printer off and on.
And save.

So, I cannot use the bl touch because I dont know what happens.. i'm very frustrated

thanks for help me!

[andyparla]

OK, the problem was the Arduino board, it is a general issue for this board

My Geeetech Pro W comes with GT2560 A+ so the three pin that wiki says you have to connect at boardh is not valid. You have to connect it as below image I attached.

And you have to change in pins.h
Wiki says:
#define SERVO0_PIN 32//13 // untested

You must to put pin 11:
#define SERVO0_PIN 11//13 // untested

It works now, but I'm not able to calibrate.
when I write "G1 Z0" command bu the nozzel is far away from bed. my Z offset is -5 (the minumum value because my configuration.h support max -15 min -5) I cannot put -4 or less.

I hope anyone can help me I'm frustred.

thanks!

[William]

I think you can refer to this post
viewtopic.php?f=20&t=19846

[andyparla]

Yes i saw it but i dont know how to set my Z offset, it is always at same altitude. This firmware comes with -1.29 offset and it is so far away from my bed. I flashed +2, 3, 5 but nozzle is always at same position. So, i dont know how to calibrate it.

My Printer is the pro W, i know it is the same than pro B but i dont it this frimware is valid.

Thanks for your reply my friend

[Lellos72]

Hi, I have the same problem, and I wanted to know if you had solved the problem?

[scoutember]

My Geeetech Pro W comes with GT2560 A+ so the three pin that wiki says you have to connect at boardh is not valid.
You have to connect it as below image I attached.

And you have to change in pins.h
Wiki says:
#define SERVO0_PIN 32 ,13 untested

You must to put pin 11
Define SERVO0_PIN 11 ,13 untested

It works now, but I'm not able to calibrate.
When I write "G1 Z0" command bu the nozzel is far away from bed. my Z offset is -5.
The minumum value because my configuration.h support max -15 min -5) I cannot put -4 or less.