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    BLtouch randomly decides to not work today

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    • deltajeggaundefined
      deltajegga
      last edited by deltajegga

      hi all, ive had a printer set up and running smooth for a few months and today the probe wont deploy for anything. the wiring seems to be intact. i have a duex expansion board and the servo output is on its pwm1 pins, i noticed the 2.5v signal wire doesn't change on my multimeter when i send a deploy command. im not sure how quick the signal is but i assume it should go high to 5v? also that was with no wires attached just measuring from pin to gnd.

      i should add that it still does its startup routine, i literally printed something yesterday and now just nothing, is there a way to rule out the board in my diag?

      1 Reply Last reply Reply Quote 0
      • deltajeggaundefined
        deltajegga
        last edited by

        ; Configuration file for Duet WiFi (firmware version 3)
        ; executed by the firmware on start-up
        ;
        ; generated by RepRapFirmware Configuration Tool v3.1.1 on Sun May 31 2020 21:54:40 GMT-0700 (Pacific Daylight Time)
        
        ; General preferences
        G90                                                ; send absolute coordinates...
        M83                                                ; ...but relative extruder moves
        M550 P"1M"                                         ; set printer name
        
        
        
        ; 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  X
        M569 P1 S0                                         ; physical drive 1 goes forwards   RY
        M569 P2 S0                                         ; physical drive 2 goes backwards  RZ
        M569 P3 S0                                         ; physical drive 3 goes forwards   E
        M569 P5 S1                                         ; physical drive 5 goes forwards   LY
        M569 P6 S0                                         ; physical drive 6 goes backwards  LZ
        
        M584 X0 Y1:5 Z6:2 E3                               ; set drive mapping
        
        M350 X16 Y16:16 Z16:16 E16 I1                      ; configure microstepping with interpolation
        
        M92 X114.29 Y114.29:114.29 Z400.00:400.00 E420.00  ; set steps per mm
        
        M566 X200.00 Y150:150 Z12:12 E120.00               ; set maximum instantaneous speed changes (mm/min)
        
        M203 X5000.00 Y5000:5000 Z500:500 E1200.00         ; set maximum speeds (mm/min)
        
        M201 X230.00 Y230:230 Z20:20 E250.00               ; set accelerations (mm/s^2)
          
        M906 X800 Y1100:1100 Z600:600 E700 I50             ; set motor currents (mA) and motor idle factor in per cent
        M84 S90                                            ; Set idle timeout
        
        
        
        
        ; Axis Limits
        M208 X0 Y0 Z0 S1                                   ; set axis min
        M208 X1400 Y880 Z900 S0                            ; set axis max
        
        ; Endstops
        M574 X1 S1 P"xstop"                                ; configure active-high endstop for low end on X via pin xstop
        M574 Y1 S1 P"ystop"                                ; configure active-high endstop for low end on Y via pin ystop
        M574 Z1 S2                                         ; configure Z-probe endstop for low end on Z
        
        ; Z-Probe
        M950 S0 C"duex.e2heat"                             ; create servo pin 0 for BLTouch
        M558 P9 C"zprobe.in+zprobe.mod" H5 F200 T10000     ; set Z probe type to bltouch and the dive height, F is dive speed, T is move speed 
        G31 P25 X28.3 Y0 Z1.7                              ; set Z probe trigger value, offset and trigger height  INCREASE Z TO MOVE CLOSER TO BED
        M557 X50:1380 Y50:870 S70                          ; define mesh grid
        M376 H20                                           ; taper off over 20mm
        
        ; Heaters
        M308 S0 P"bedtemp" Y"thermistor" T100000 B4138     ; configure sensor 0 as thermistor on pin bedtemp
        M950 H0 C"bedheat" Q120 T0                              ; create bed heater output on bedheat and map it to sensor 0    Q set pwm
        M307 H0 B0 S1.00 A137 D6.4 C1400                ; enable PID mode for the bed heater and set PWM limit
        M140 H0                                            ; map heated bed to heater 0
                            
        
        M143 H0 S120                                       ; set temperature limit for heater 0 to 120C
        M308 S1 P"e0temp" Y"thermistor" T100000 B4138      ; 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 A931 D7.4 C500                    ; disable bang-bang mode for heater  and set PWM limit
        
        
        
        ; 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
        
        ; 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
        
        
        
        ; Miscellaneous
        
        M671 X50:1480 Y440:440 S10                         ; x gantry leveling
        
        
        M911 S22 R23 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
        T0                                                 ; select first tool
        
        
        M950 J1 C"duex.e2stop"
        M581 P1 T0 R0 S1                                   ;emergency stop
        
        
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        • Phaedruxundefined
          Phaedrux Moderator
          last edited by

          If it's still doing the startup self test then the mechanism is still functional.

          If you send M401 and it doesn't deploy, and you haven't changed your config at all, that would seem to leave the wiring between the servo pin on the Duex and the BLtouch as the likely culprit.

          Z-Bot CoreXY Build | Thingiverse Profile

          deltajeggaundefined 1 Reply Last reply Reply Quote 0
          • deltajeggaundefined
            deltajegga @Phaedrux
            last edited by deltajegga

            @Phaedrux i just actually checked each wire individually with a multimeter and all show continuity, so i guess i can try a different servo output on my duex, maybe something happened. other than that idk, maybe the bltouch died but still self tests? i have another bltouch on my other machine, but i really dont want to take it off to rule out the bltouch unless thats my only option. and i also just double check that i have 5v and 2.5v out the end of the harness

            1 Reply Last reply Reply Quote 0
            • Phaedruxundefined
              Phaedrux Moderator
              last edited by

              Testing with another bltouch would help eliminate the possibility the touch is bad. But the self test working means it's probably not getting the signal.

              Trying a different pwm pin on the duex is another good test.

              Bltouch wiring is notoriously bad and responsible for most issues.

              Z-Bot CoreXY Build | Thingiverse Profile

              1 Reply Last reply Reply Quote 0
              • deltajeggaundefined
                deltajegga
                last edited by deltajegga

                just tested the other bltouch and still no deploy. is there a way for me to know if the duet is physically sending the deploy signal on the pwm signal wire? should be the left pin of the three? i edited the other reply but i do have a good 2.5 and 5v to the bltouch.

                and to switch pwm output i should only have to change duex.e2heat to duex.e3heat for pwm2?

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                • 3dMLundefined
                  3dML
                  last edited by

                  @deltajegga Have you check the deployprobe.g file for errors? The self test will still work without deployprobe.g or retractprobe.g.

                  Try

                  M280 P0 S10 ; deploy BLTouch 
                  
                  1 Reply Last reply Reply Quote 0
                  • deltajeggaundefined
                    deltajegga
                    last edited by deltajegga

                    yeah, it just does nothing, everything else is working except the deploy and retract of the probe, if i pull the probe down manually the red light turns off but there is no blue light. also i though it should flash red if you pull it down manually?

                    just measured signal voltage on my other printer and its yellow signal pin is at 3.33 volts, and this is at 2.5v. does this matter?

                    DIY-O-Sphereundefined 1 Reply Last reply Reply Quote 0
                    • DIY-O-Sphereundefined
                      DIY-O-Sphere @deltajegga
                      last edited by

                      @deltajegga
                      Please check the configuration of Bltouch

                      M950 S0 C"duex.e2heat"   
                      M558 P9 C"zprobe.in+zprobe.mod" H5 F200 T10000
                      

                      should be

                      M950 S0 C"!duex.e2heat"   
                      M558 P9 C"^zprobe.in" H5 F200 T10000
                      

                      Background:
                      https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe#Section_Software_setup_RepRapFirmware_Num_3
                      https://duet3d.dozuki.com/Wiki/RepRapFirmware_3_overview#Section_Pin_names_for_Duet_2_WiFi_Ethernet

                      (UTC+1)

                      deltajeggaundefined 1 Reply Last reply Reply Quote 0
                      • deltajeggaundefined
                        deltajegga @DIY-O-Sphere
                        last edited by deltajegga

                        @DIY-O-Sphere i tried that and still no dice, i mean i dont see how that could be the issue if its been working since may. i dont fully understand how all of that is supposed to work, but it was working whit the config as is.

                        quick recap
                        -haven't touched config in months
                        -bltouch is confirmd good
                        -wire harness shows cont on all wires from duet to probe plug and a strong 5v and 2.5v to the probe
                        -tried changing line 57 to duex.e3heat and tried pwm2 plug on duex
                        -noticed that my other printer on RRF2 the signal pin is at 3.33v and this one is at 2.5v (the signal to deploy the probe, not the hall sensor signal)
                        -DWC2 says zprobe 0 whether i manually pull the pin down or up.
                        -am confused...

                        DIY-O-Sphereundefined 1 Reply Last reply Reply Quote 0
                        • DIY-O-Sphereundefined
                          DIY-O-Sphere @deltajegga
                          last edited by

                          @deltajegga
                          Maybe you should try to plug the signal pin directly to the Duet

                          (UTC+1)

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                          • deltajeggaundefined
                            deltajegga
                            last edited by deltajegga

                            its been a while but you cant with the duex expansion ribbon installed correct? dont the servo wires plug into the large expansion heaader?

                            i should clarify that i mean the signal wire for the servo wires, not the signal for bltouch prob position.

                            DIY-O-Sphereundefined 2 Replies Last reply Reply Quote 0
                            • DIY-O-Sphereundefined
                              DIY-O-Sphere @deltajegga
                              last edited by DIY-O-Sphere

                              @deltajegga
                              I'm not an expert for duex, but as far as I know, the signal for the heater is inverted. Maybe there is a defect on the board...

                              (UTC+1)

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                              • DIY-O-Sphereundefined
                                DIY-O-Sphere @deltajegga
                                last edited by

                                @deltajegga said in BLtouch randomly decides to not work today:

                                signal wire

                                Connected to the heater

                                (UTC+1)

                                deltajeggaundefined 2 Replies Last reply Reply Quote 0
                                • deltajeggaundefined
                                  deltajegga @DIY-O-Sphere
                                  last edited by

                                  @DIY-O-Sphere something at add, im not 100% sure, but i dont remember the leds being lit up on the duex e2,3,and4 heater teminals...maybe they were, idk. but it seem like they shouldn't be.

                                  1 Reply Last reply Reply Quote 0
                                  • deltajeggaundefined
                                    deltajegga @DIY-O-Sphere
                                    last edited by

                                    @DIY-O-Sphere connected to PWM1 on duex

                                    DIY-O-Sphereundefined 1 Reply Last reply Reply Quote 0
                                    • DIY-O-Sphereundefined
                                      DIY-O-Sphere @deltajegga
                                      last edited by

                                      @deltajegga
                                      Pwm and heaters are shared on the duex

                                      (UTC+1)

                                      deltajeggaundefined 1 Reply Last reply Reply Quote 0
                                      • deltajeggaundefined
                                        deltajegga @DIY-O-Sphere
                                        last edited by

                                        @DIY-O-Sphere so that would make sense that the duex e2 heater led is on, but i wonder why 3 and 4 are on.

                                        DIY-O-Sphereundefined 1 Reply Last reply Reply Quote 0
                                        • DIY-O-Sphereundefined
                                          DIY-O-Sphere @deltajegga
                                          last edited by DIY-O-Sphere

                                          @deltajegga
                                          You are shure you haven't updated firmware? On some releases you had to free up the heater channels for use with the BLtouch.

                                          (UTC+1)

                                          1 Reply Last reply Reply Quote 0
                                          • deltajeggaundefined
                                            deltajegga
                                            last edited by

                                            yep, ive been printing smoothly since may.

                                            DIY-O-Sphereundefined 1 Reply Last reply Reply Quote 0
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