BLTouch Homing in wrong direction
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here is home z
; homez.g
; called to home the Z axis
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; generated by RepRapFirmware Configuration Tool v3.1.4 on Thu Oct 01 2020 12:28:31 GMT+0100 (British Summer Time)
G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current position
G90 ; absolute positioning
G1 X50 Y50 F6000 ; go to first probe point
G30 ; home Z by probing the bed; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 Z5 F100 ; lift Z relative to current position
;G90 ; absolute positioning -
@chris said in BLTouch Homing in wrong direction:
G31 P500 X0 Y0 Z3.7
In your config.g file there is this line related to the Z probe.
Being a BLTouch the P parameter should be 25.
And I cannot image how the X and Y offsets could be 0. Those values are saying that the BLTouch pin is right where the nozzle is, along the X and Y axes.
As to the probe self-testing but not working you need to verify that the wiring is correct. It's getting power but it seems it may not be getting the control signal.
Frederick
Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6
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Replace your zprobe section and deploy and retract macros with the ones I posted above. I took your values from your original config and brought them forward. The one you just generated doesn't have that.
Was the deploy and retract working before?
M280 P0 Z10.
That should be S10 not Z10
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yeah before I upgraded to v 3.1.1 yeah sorry was M280 P0 S10
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@fcwilt Sorry this was g31
G31 P50 X46.5 Y0 Z3.7 ; set Z probe trigger value, offset and trigger height
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@Phaedrux yeah still no joy with G31 S-1 or M280 P0 S10. even when copied config u posted above using bltouch on heater 7 pwm on duet expansion breakout board. Obviously is wired correctly as does self test fine when power applied to the printer. Just not deploying.
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@chris said in BLTouch Homing in wrong direction:
@fcwilt Sorry this was g31
G31 P50 X46.5 Y0 Z3.7 ; set Z probe trigger value, offset and trigger height
Those values look reasonable. But I believe that P50 should be P25.
Frederick
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@fcwilt Wouldn't have thought that would have stopped it deploying though isn't that just trigger value?
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@chris said in BLTouch Homing in wrong direction:
@Phaedrux yeah still no joy with G31 S-1 or M280 P0 S10. even when copied config u posted above using bltouch on heater 7 pwm on duet expansion breakout board. Obviously is wired correctly as does self test fine when power applied to the printer. Just not deploying.
Self test only requires that the power and ground connections be correct.
If the control signal from the duet that triggers the probe deployment doesn't get to the probe then it won't work.
So either the configuration of the Z probe doesn't match the pin you are using to trigger the probe OR something has happened to the wiring .
Frederick
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@chris said in BLTouch Homing in wrong direction:
on heater 7 pwm on duet expansion breakout board.
Can you post a photo of how you're connected? Are you connecting to the expansion pins on the duet or to a separate breakout board?
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@chris said in BLTouch Homing in wrong direction:
@fcwilt Wouldn't have thought that would have stopped it deploying though isn't that just trigger value?
No it wouldn't cause it to fail to deploy but it can affect the accuracy of the readings - once you get it working.
Frederick
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@chris said in BLTouch Homing in wrong direction:
@Phaedrux
here is an image bltouch pwm on heater 7 pwm and the switch wires on z probe in. was working fine before upgrading to v3.1.1.I've not seen that little board before. Does it always use heater 7 for the Z probe?
Frederick
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yeah just makes heater 7 and heater 6 available from the ide / ribbon pin connector
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In that case I would suggest removing the breakout board entirely. You can connect directly to the needed pins on the expansion port. Using the breakout board is likely changing the name of the pin being used for the M950 definition, but I'll have to check what that is. In the meantime, just connect the BLtouch directly to the expansion pins as shown here.
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@Phaedrux just for the heater pwm pins
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@chris said in BLTouch Homing in wrong direction:
yeah just makes heater 7 and heater 6 available from the ide / ribbon pin connector
And you verified the connector you are using is the heater 7 connection?
I wasn't able to determine which connector did what.
Frederick
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used multimeter to prove continuity between the pins on idc ribbon cable and heater pwm pins
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I think it may behave like the Duex pwm pin and just needs to be inverted in RRF3.
So if you still want to use the expansion breakout board, try inverting the servo pin command by adding an exclamation point like this
; Z-Probe M950 S0 C"!exp.heater7" ; create servo pin 0 for BLTouch
