BLTouch stuck at 1000

[Nurgelrot]

@messiahman Cosmic rays... BLtouch are touchy. I had one just go nuts once too would always error out on a G29 ended up just replacing it cuz I never did figure out what was the issue and the config had worked for long time (and still does with the new one). But don't get too drastic yet. fiddle with the pin etc... see if you can see when/why it thinks its deployed. move your signal wires away from steppers etc...

[PCR]

@nurgelrot Sometimes is the grub screw. The screw has to be at a exact distance. See the manual for it

[rjenkinsgb]

Is the BLTouch well clear of the bed when you power on?

If the probe touches the bed when it tries to do its self-test, it will fail.

[Messiahman]

@rjenkinsgb yeah no the entire extruder head is nearly to the top of the print area cuz my last print ended off pretty high up

[dc42]

@messiahman if the reading is 1000 when the pin is extended, most likely there is a break in the signal connection. On a genuine BLTouch this is usually the white wire.

[Messiahman]

@dc42 I've checked all the wires, theyre all pretty strong connections

[Phaedrux]

Use a multimeter to test continuity of the wires themselves.

[dc42]

@messiahman you can test the Duet and your configuration by disconnecting the white wire and connecting that input on the Duet to ground. That should make the reading go to 0.

[Messiahman]

@dc42 that didn't work

[dc42]

@messiahman please post your config.g file and post a photo of the wiring connecting the BLTouch to the Duet.

[Messiahman]

@dc42 will do, but i did just unplug the whole bltouch to try and dispel any charge in the capacitor and replugged it all in, and now it won't deploy or retract.

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.3 on Wed Oct 06 2021 12:37:23 GMT-0400 (Eastern Daylight Time)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"The Print-inator" ; set printer name
M918 P1 E4 F2000000 ; configure direct-connect display

; Network
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet

; Drives
M569 P0 S0 ; physical drive 0 goes backwards
M569 P1 S0 ; physical drive 1 goes backwards
M569 P2 S0 ; physical drive 2 goes backwards
M569 P3 S1 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E136.79 ; set steps per mm
M566 X1200.00 Y1200.00 Z24.00 E300.00 ; set maximum instantaneous speed changes (mm/min)
M203 X9000.00 Y9000.00 Z180.00 E6000.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z100.00 E5000.00 ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E1000 I50 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X235 Y235 Z260 S0 ; set axis maxima

; Endstops
M574 X2 S1 P"xstop" ; configure active-high endstop for high end on X via pin xstop
M574 Y2 S1 P"ystop" ; configure active-high endstop for high end on Y via pin ystop
M574 Z1 S2 ; configure Z-probe endstop for low end on Z

; Z-Probe
M950 S0 C"exp.heater3" ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H3 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X40.00 Y5.0 Z1.250 ; set Z probe trigger value, offset and trigger height
M557 X40:220 Y25:220 S41 ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4092 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B1 S1.00 ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S150 ; set temperature limit for heater 0 to 150C
M308 S1 P"e0temp" Y"thermistor" T100000 B4092 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M143 H1 S275 ; set temperature limit for heater 1 to 275C

; Fans
M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45 ; set fan 1 value. Thermostatic control is turned on
M950 F2 C"fan2" Q500 ; create fan 2 on pin fan2 and set its frequency
M106 P2 S1 H1:0 T45 ; set fan 2 value. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0 ; define tool 0
G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C

; Custom settings are not defined

; Miscellaneous
M501 ; load saved parameters from non-volatile memory
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss

[Phaedrux]

@messiahman said in BLTouch stuck at 1000:

and now it won't deploy or retract.

Does it light up at all? The plug at the BLTouch end is very delicate.

[Messiahman]

@phaedrux the red light comes on yes, but not the blue. it also goes through the startup sequence

[wieman01]

Could you also post the contents of "deployprobe.g" and "retractprobe.g" please? There is a chance that's the source of your problem.

[wieman01]

The reason why I am asking is this:

When you are issuing either M401 or M402 your BL's pin should move down or retract. If it does not, then either these files are missing altogether or they are referring to the wrong servo pin number.

M950 S0 C"exp.heater3"

The contents of deployprobe.g should look like this based upon your config.g (P0 = S0 = pin number):

M280 P0 S10 

And second your retractprobe.g would be:

M280 P0 S90

Issue single M401 and M402 to see if your BL responds.

[Messiahman]

@wieman01 I haven't changed them since i first got them working, but sure, let me pull them up

M280 P0 S10 I1; deploy BLTouch

M280 P0 S90 I1; retract BLTouch

[Phaedrux]

@messiahman said in BLTouch stuck at 1000:

I1

Remove those as they aren't used in RRF3 to invert. That's done in the pin definition now. Though it won't stop it from working.

I think you have a cabling issue. Can you show a photo of where the wires are plugged in both at the board and the probe? Can you test connecting the probe directly to the board with it's short pig tail wires to remove your extension wires from the equation?

[wieman01]

Also let us know what BL version you have got. Depending upon the version you may need different cabling (including a resistor, etc.). You find the version number on the back of the device.