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Z homing with bltouch

Posted by acca

acca

Z homing with bltouch
March 11, 2020 12:46PM

Registered: 4 years ago
Posts: 6

Hello,
I'm making a homemade printer using marlin
I have a bltouch and a z endstop switch (approx at z=155mm)
When I launch homing, the z endstop switch is used, is that the normal behaviour ?
I'd like the bltouch to be used, is that possible ? Safe ?
Thanks

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MMcLure

Re: Z homing with bltouch
March 11, 2020 12:50PM

Registered: 6 years ago
Posts: 265

Yes - the easiest way to do this is to remove the Z end stop switch and plug the BLTouch into the Z min end stop connector.
Then enable Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN and Z_SAFE_HOMING.

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acca

Re: Z homing with bltouch
March 11, 2020 01:01PM

Registered: 4 years ago
Posts: 6

And is that possible to keep the switch for security ?

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MMcLure

Re: Z homing with bltouch
March 11, 2020 08:12PM

Registered: 6 years ago
Posts: 265

No, but unless you have ENDSTOPS_ALWAYS_ON_DEFAULT enabled the endstop switches are ignored except for homing anyway.

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acca

Re: Z homing with bltouch
March 12, 2020 05:07PM

Registered: 4 years ago
Posts: 6

My bad
I was using homedir 1 instead of -1 for z axis
Now I have the switch connected to zmax endstop and bltouch to zmin endstop and used for homing
Thanks