SOLVED Help with inductive NPN probe stuck at 1000



  • I am trying to get a inductive z probe set up however it reads 1000 on the web interface and when trying to home is says "Error no z probe" I followed the wiki guide "https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe" and directly wired it to the z probe input. I triple checked the wired and they are all connected and working with a multimeter. Ive tried going through dozens of posts online and each one says something completely different to another and cant find any tutorial on what exactly I need to have in my config.g for this to work.

    Can someone please help a idiot like me and tell me exactly what I need to do to get this working. I have been on this board for over 2 months now trouble shooting all the issues its been giving me. I am pretty disappointed though with this last problem I hope I can finally have a fully functional setup.

    ; Configuration file for Duet WiFi (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v3.1.4 on Sat Oct 03 2020 10:18:18 GMT-0400 (Eastern Daylight Time)
    
    ; General preferences
    G90                                            ; send absolute coordinates...
    M83                                            ; ...but relative extruder moves
    M550 P"My Printer"                             ; 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 S1                                     ; physical drive 0 goes forwards
    M569 P1 S1                                     ; physical drive 1 goes forwards
    M569 P2 S1                                     ; physical drive 2 goes forwards
    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 E220.00              ; set steps per mm
    M566 X900.00 Y900.00 Z12.00 E120.00            ; set maximum instantaneous speed changes (mm/min)
    M203 X6000.00 Y6000.00 Z180.00 E1200.00        ; set maximum speeds (mm/min)
    M201 X500.00 Y500.00 Z20.00 E250.00            ; set accelerations (mm/s^2)
    M906 X1500 Y1500 Z1000 E1500                   ; set motor currents (mA)
    M84 S0                                         ; Disable motor idle current reduction
    
    ; Axis Limits
    M208 X0 Y0 Z0 S1                               ; set axis minima
    M208 X230 Y210 Z200 S0                         ; set axis maxima
    
    ; 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
    M574 Z0 P"nil"
    M558 P5 C"zstop" H5 F120 T3000                         ; set Z probe type to switch and the dive height + speeds
    
    ; Heaters
    M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; 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 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                               ; 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
    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
    
    ; 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
    M307 H0 A100  ; Heater Bed Temp Setting to avoid heating too slow error
    
    M143 H1 S420 ; extruder max temp
    

  • Moderator

    @rowow said in Help with inductive NPN probe stuck at 1000:

    ; Z-Probe M574 Z0 P"nil" M558 P5 C"zstop" H5 F120 T3000 ; set Z probe type to switch and the dive height + speeds

    Remove the M574 Z0 P"nil"

    Are you wired to the zprobe connection or to Zstop pin?

    You're also missing a G31 command.

    Can you post your homeall?

    Also post the results of M122 and M98 P"config.g".



  • @Phaedrux

    I wired it directly as the wiki stated without the diode to the z probe connection. please see the attached photo for clarification

    What do I need to put in for the G31 command

    homeall.g

    ; homeall.g
    ; called to home all axes
    ;
    ; generated by RepRapFirmware Configuration Tool v3.1.4 on Sat Oct 03 2020 10:18:18 GMT-0400 (Eastern Daylight Time)
    G91                     ; relative positioning
    G1 H2 Z5 F6000          ; lift Z relative to current position
    G1 H1 X-235 Y-215 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
    G1 H2 X5 Y5 F6000       ; go back a few mm
    G1 H1 X-235 Y-215 F360  ; move slowly to X and Y axis endstops once more (second pass)
    G90                     ; absolute positioning
    G1 X15 Y15 F6000        ; go to first bed probe point and home Z
    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
    

    Results of M122 and M98:

    5:00:20 PMM98 P"config.g"
    HTTP is enabled on port 80
    FTP is disabled
    TELNET is disabled
    Warning: Heater 0 appears to be over-powered. If left on at full power, its temperature is predicted to reach 365C
    5:00:08 PMM98
    
    
    
    ![Captddure.PNG](/assets/uploads/files/1607637956781-captddure.png) 
    4:59:59 PMM122
    === Diagnostics ===
    RepRapFirmware for Duet 2 WiFi/Ethernet version 3.2-beta1 running on Duet WiFi 1.02 or later
    Board ID: 0JD0M-9K662-MGPSN-6J1D6-3S86N-KAX6Z
    Used output buffers: 3 of 24 (6 max)
    === RTOS ===
    Static ram: 23916
    Dynamic ram: 98916 of which 44 recycled
    Exception stack ram used: 256
    Never used ram: 7940
    Tasks: NETWORK(ready,221) HEAT(blocked,308) MAIN(running,456) IDLE(ready,20)
    Owned mutexes: WiFi(NETWORK)
    === Platform ===
    Last reset 00:07:55 ago, cause: power up
    Last software reset at 2020-12-09 17:14, reason: User, GCodes spinning, available RAM 7924, slot 1
    Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0041f000 BFAR 0xe000ed38 SP 0xffffffff Task MAIN
    Error status: 0x020
    MCU temperature: min 21.9, current 24.4, max 24.9
    Supply voltage: min 24.0, current 24.1, max 24.2, under voltage events: 0, over voltage events: 0, power good: yes
    Driver 0: position 0, standstill, SG min/max not available
    Driver 1: position 0, standstill, SG min/max not available
    Driver 2: position 0, standstill, SG min/max not available
    Driver 3: position 0, standstill, SG min/max not available
    Driver 4: position 0, standstill, SG min/max not available
    Driver 5: position 0
    Driver 6: position 0
    Driver 7: position 0
    Driver 8: position 0
    Driver 9: position 0
    Driver 10: position 0
    Driver 11: position 0
    Date/time: 2020-12-10 16:59:58
    Cache data hit count 838659451
    Slowest loop: 6.57ms; fastest: 0.15ms
    I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
    === Storage ===
    Free file entries: 10
    SD card 0 detected, interface speed: 20.0MBytes/sec
    SD card longest read time 1.4ms, write time 0.0ms, max retries 0
    === Move ===
    Hiccups: 0(0), FreeDm: 169, MinFreeDm: 169, MaxWait: 0ms
    Bed compensation in use: none, comp offset 0.000
    === MainDDARing ===
    Scheduled moves: 0, completed moves: 0, StepErrors: 0, LaErrors: 0, Underruns: 0, 0 CDDA state: -1
    === AuxDDARing ===
    Scheduled moves: 0, completed moves: 0, StepErrors: 0, LaErrors: 0, Underruns: 0, 0 CDDA state: -1
    === Heat ===
    Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1 -1 -1
    === GCodes ===
    Segments left: 0
    Movement lock held by null
    HTTP is idle in state(s) 0
    Telnet is idle in state(s) 0
    File is idle in state(s) 0
    USB is idle in state(s) 0
    Aux is idle in state(s) 0
    Trigger is idle in state(s) 0
    Queue is idle in state(s) 0
    LCD is idle in state(s) 0
    Daemon is idle in state(s) 0
    Autopause is idle in state(s) 0
    Code queue is empty.
    === Network ===
    Slowest loop: 14.24ms; fastest: 0.00ms
    Responder states: HTTP(2) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0), 0 sessions
    HTTP sessions: 1 of 8
    - WiFi -
    Network state is active
    WiFi module is connected to access point
    Failed messages: pending 0, notready 0, noresp 0
    WiFi firmware version 1.21
    WiFi MAC address f4:cf:a2:69:53:26
    WiFi Vcc 3.36, reset reason Turned on by main processor
    WiFi flash size 4194304, free heap 15616
    WiFi IP address 192.168.1.132
    WiFi signal strength -50dBm, reconnections 0, sleep mode modem
    Clock register ffffffff
    Socket states: 4 0 0 0 0 0 0 0
    


  • alt text

    No diode though as the wikipedia states it doesnt need one for my board version
    "Duet 3, Duet 2 Maestro, or revision 1.04 or later of Duet 2 WiFi or Duet 2 Ethernet: you can connect the output of the sensor directly to the Z-probe IN pin."


  • Moderator

    @rowow said in Help with inductive NPN probe stuck at 1000:

    M558 P5 C"zstop" H5 F120 T3000

    Well if you're wired to the z probe connector, you shouldn't have zstop as the pin name, you should have zprobe.

    @rowow said in Help with inductive NPN probe stuck at 1000:

    version 3.2-beta1

    If you're wanting to run the beta releases you should probably update to 3.2 beta 4.1, or revert back to the stable release 3.1.1.

    @rowow said in Help with inductive NPN probe stuck at 1000:

    G1 X15 Y15 F6000 ; go to first bed probe point and home Z G30 ; home Z by probing the bed

    You should probably change the X15 Y15 to position the probe at the center of the bed.

    @rowow said in Help with inductive NPN probe stuck at 1000:

    What do I need to put in for the G31 command

    https://duet3d.dozuki.com/Wiki/Gcode?revisionid=HEAD#Section_G31_Set_or_Report_Current_Probe_status

    The configurator produces this when a switch style probe is selected.

    ; Z-Probe
    M558 P5 C"^zprobe.in" H5 F120 T6000                ; set Z probe type to switch and the dive height + speeds
    G31 P500 X0 Y0 Z2.5                                ; set Z probe trigger value, offset and trigger height
    M557 X15:215 Y15:195 S20                           ; define mesh grid
    

    For the G31 X Y Z offsets you'll need to measure.

    https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe



  • Thank you, adding the following code has allowed the Z probe to start working. When the induction probe is in front of metal it reads 0 when not it reads 1000.

    However now when trying to home the Z axis it says "error z probe already triggered"


  • Moderator

    In that case you will need to invert the signal by adding a ! to the start of the pin name, like this.

    M558 P5 C"^!zprobe.in"



  • @Phaedrux Thank you so much! It finally works. Would be nice if they had all this simply on the wiki. Is there any proper place I can search for information or is the forums the only place. I think thats all for now but in the future it would be nice to have a up to date source of information.


  • Moderator

    @rowow Well you can image how many random probes are out there, so how exactly they work with the firmware varies quite a bit, making exact documentation for every single device out there impossible.


  • administrators

    @rowow said in Help with inductive NPN probe stuck at 1000:

    @Phaedrux Thank you so much! It finally works. Would be nice if they had all this simply on the wiki. Is there any proper place I can search for information or is the forums the only place. I think thats all for now but in the future it would be nice to have a up to date source of information.

    It's already covered at the end of https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe#Section_NPN_output_normally_open_inductive_or_capacitive_sensor but some examples would make it clearer.


Log in to reply