BLTouch passes self test, will not manually deploy.

Design · 12 Apr 2023, 18:27

Hello all,

We are still trying to commission a modix Big-60. We are having issues with the BLTouch deploying. The BLTouch will run and pass the self-test at bootup. If I run the "test probe" macro, the blue light will illuminate on the BLTouch, but the pin will not move.

We are using the official files from the Modix github. Here is relevant information about the machine.

Duet 2 Wifi
Firmware Version 3.4.5
BLTouch runs self test and passes, solid red led after self test
BLTouch version is v3.1
BLTouch connected to Duex5 PWM5 (E6_PWM)
BLTouch is confirmed working, tested on another machine, BLTouch is not faulty
Ribbon cable has been tested, max resistance measured was 0.5 ohms.
Cable from Duex5 to BLTouch has been tested, max resistance is 0.5 ohms
Macros and manual deployment do not work.

Config.g, relevant section.

 ; Z-Probe
M558 P9 C"zprobe.in" H3 F100 T9000 R0.5						; BLTouch probing settings
M950 S0 C"duex.pwm5"										; sets the BLTouch probe
M376 H100			                						; Height (mm) over which to taper off the bed compensation
G31 P500 X-25.5 Y26.9										; BLTouch X and Y offset
M557 X{move.axes[0].min + sensors.probes[0].offsets[0] + 1, move.axes[0].max + sensors.probes[0].offsets[0] - 1} Y{move.axes[1].min + sensors.probes[0].offsets[1] + 1, move.axes[1].max + sensors.probes[0].offsets[1] - 1} P10:10
; The M557 is used to define the mesh grid area. It uses the P parameter to set the amount of probing points. P10:10 would be a 10x10 grid. Supports up to a 21x21 grid. 
M98 P"config_probe.g"										; Load the Z-offset from the config_probe.g file
; The Z_offset value is now set in config_probe.g, not in config.g
; Adjust the values there, do not adjust anything here.

There is no other M950 S0 command in config.g. There is no other command that uses "duex.pwm5".

This is the macro file that is provided to test the probe.

 ; Macro file for Duet WiFi
; Generated by Modix - Version 3.4.2 Macro A
 
M291 S3 R"BL-Touch self-test" P"The BL-Touches pin will be deployed and retracted ten times - Press OK to continue"
M280 P0 S60 I1
G4 S1
M280 P0 S120 I1
G4 S9
M291 R"Thank you" P"BL-Touch self-test has been accomplished" T46

From reading the documentation, it appears that the inversion for M280 is no longer supported in rrf3.
I also realize that the comments in the macro files from modix state "3.4.2", however they were downloaded from the 3.4.5 release.

What parameters do I need to modify to get the BLTouch to deploy? I have been in touch with Modix support, however clearly it seems something is amiss with their configuration files.

Thank you

alankilian · 12 Apr 2023, 19:26

@Design THIS LINK should help you get it working.

Phaedrux · 13 Apr 2023, 04:55

Here's what the config tool gives me.

 ; Z-Probe
M950 S0 C"duex.pwm5"                           ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F120 T6000            ; set Z probe type to bltouch and the dive height + speeds

 ; deployprobe.g
; called to deploy a physical Z probe
;
M280 P0 S10 ; deploy BLTouch

 ; retractprobe.g
; called to retract a physical Z probe
;
M280 P0 S90 ; retract BLTouch

Then test deployment with M401 and M402

Design · 13 Apr 2023, 19:28

@Phaedrux said in BLTouch passes self test, will not manually deploy.:

Here's what the config tool gives me.

 ; Z-Probe
M950 S0 C"duex.pwm5"                           ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F120 T6000            ; set Z probe type to bltouch and the dive height + speeds

 ; deployprobe.g
; called to deploy a physical Z probe
;
M280 P0 S10 ; deploy BLTouch

 ; retractprobe.g
; called to retract a physical Z probe
;
M280 P0 S90 ; retract BLTouch

Then test deployment with M401 and M402

I have implemented the requested changes.

Config.g

 ; Z-Probe
;M558 P9 C"zprobe.in" H3 F100 T9000 R0.5						; BLTouch probing settings
;M950 S0 C"duex.pwm5"											; sets the BLTouch probe
M950 S0 C"duex.pwm5"                           ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F120 T6000            ; set Z probe type to bltouch and the dive height + speeds
M376 H100			                						; Height (mm) over which to taper off the bed compensation
G31 P500 X-25.5 Y26.9										; BLTouch X and Y offset
M557 X{move.axes[0].min + sensors.probes[0].offsets[0] + 1, move.axes[0].max + sensors.probes[0].offsets[0] - 1} Y{move.axes[1].min + sensors.probes[0].offsets[1] + 1, move.axes[1].max + sensors.probes[0].offsets[1] - 1} P10:10
; The M557 is used to define the mesh grid area. It uses the P parameter to set the amount of probing points. P10:10 would be a 10x10 grid. Supports up to a 21x21 grid. 
M98 P"config_probe.g"										; Load the Z-offset from the config_probe.g file
; The Z_offset value is now set in config_probe.g, not in config.g
; Adjust the values there, do not adjust anything here.

deployprobe.g

 ; deployprobe.g
; called to deploy a physical Z probe
M280 P0 S10			; deploy BLTouch

retractprobe.g

 ; retractprobe.g
; called to retract a physical Z probe
;
M280 P0 S90 		; retract BLTouch

The pin still does not deploy or retract when using m401 and m402. When sending the M401 command, the blue light on the BLTouch turns on dim. When running M402, the light becomes brighter. When running M401, the light becomes dim again. This seems that the BLTouch is getting the command, but the pin is still not deploying.

When running M280 P0 S60, the pin will deploy down.

Phaedrux · 13 Apr 2023, 19:35

And you say it works correctly on another machine? Very strange. It sounds like it's behaving like the pin is dirty or stuck, but then it wouldn't deploy correctly during the startup test or connected to another machine, yet it seems to be correctly getting the commands as the LEDs are changing.

Do you have another free PWM port on the Duex? It may be worth trying a different port.

Design · 13 Apr 2023, 19:36

@Phaedrux I can change it to a different PWN port. It deploys with the M280 P0 S60 command. Maybe I need a different duty cycle?

Phaedrux · 13 Apr 2023, 19:37

@Design said in BLTouch passes self test, will not manually deploy.:

It deploys with the M280 P0 S60 command.

This is putting it in test mode.

Design · 13 Apr 2023, 19:38

@Phaedrux but the pin still deploys, so at least it is getting the command correctly. Could it be voltage drop?

Phaedrux · 13 Apr 2023, 19:43

@Design said in BLTouch passes self test, will not manually deploy.:

Could it be voltage drop?

Do you have a multimeter to test the voltage at the bltouch?

Design · 13 Apr 2023, 20:01

@Phaedrux I just swapped it to PWM4 and it's working flawlessly now with m401/m402. However, now I'm getting driver short/over temperature errors for one of the drivers on the duex5. Could the board be faulty? It seems like issue after issue is coming up with it. It's brand new, haven't even been able to print on it yet. The most I've been able to do is jog the axes.

Phaedrux · 13 Apr 2023, 20:13

Can you try removing and reinstalling the ribbon cable between the Duet and Duex?

	; Z-Probe
	M558 P9 C"zprobe.in" H3 F100 T9000 R0.5 ; BLTouch probing settings
	M950 S0 C"duex.pwm5" ; sets the BLTouch probe
	M376 H100 ; Height (mm) over which to taper off the bed compensation
	G31 P500 X-25.5 Y26.9 ; BLTouch X and Y offset
	M557 X{move.axes[0].min + sensors.probes[0].offsets[0] + 1, move.axes[0].max + sensors.probes[0].offsets[0] - 1} Y{move.axes[1].min + sensors.probes[0].offsets[1] + 1, move.axes[1].max + sensors.probes[0].offsets[1] - 1} P10:10
	; The M557 is used to define the mesh grid area. It uses the P parameter to set the amount of probing points. P10:10 would be a 10x10 grid. Supports up to a 21x21 grid.
	M98 P"config_probe.g" ; Load the Z-offset from the config_probe.g file
	; The Z_offset value is now set in config_probe.g, not in config.g
	; Adjust the values there, do not adjust anything here.

	; Macro file for Duet WiFi
	; Generated by Modix - Version 3.4.2 Macro A

	M291 S3 R"BL-Touch self-test" P"The BL-Touches pin will be deployed and retracted ten times - Press OK to continue"
	M280 P0 S60 I1
	G4 S1
	M280 P0 S120 I1
	G4 S9
	M291 R"Thank you" P"BL-Touch self-test has been accomplished" T46

	; Z-Probe
	M950 S0 C"duex.pwm5" ; create servo pin 0 for BLTouch
	M558 P9 C"^zprobe.in" H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds

	; deployprobe.g
	; called to deploy a physical Z probe
	;
	M280 P0 S10 ; deploy BLTouch

	; retractprobe.g
	; called to retract a physical Z probe
	;
	M280 P0 S90 ; retract BLTouch

	; Z-Probe
	;M558 P9 C"zprobe.in" H3 F100 T9000 R0.5 ; BLTouch probing settings
	;M950 S0 C"duex.pwm5" ; sets the BLTouch probe
	M950 S0 C"duex.pwm5" ; create servo pin 0 for BLTouch
	M558 P9 C"^zprobe.in" H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
	M376 H100 ; Height (mm) over which to taper off the bed compensation
	G31 P500 X-25.5 Y26.9 ; BLTouch X and Y offset
	M557 X{move.axes[0].min + sensors.probes[0].offsets[0] + 1, move.axes[0].max + sensors.probes[0].offsets[0] - 1} Y{move.axes[1].min + sensors.probes[0].offsets[1] + 1, move.axes[1].max + sensors.probes[0].offsets[1] - 1} P10:10
	; The M557 is used to define the mesh grid area. It uses the P parameter to set the amount of probing points. P10:10 would be a 10x10 grid. Supports up to a 21x21 grid.
	M98 P"config_probe.g" ; Load the Z-offset from the config_probe.g file
	; The Z_offset value is now set in config_probe.g, not in config.g
	; Adjust the values there, do not adjust anything here.