BL Touch deploys/retracts 2x when turn on board but nothing else



  • Hi,
    Using BL Touch 3.1 as a Z end stop as well
    Duet WIFI without any expansion board
    The probe deploys and retracts twice when I turn on the board. A red led turns on (doesn’t blink).
    Problem, it simply doesn’t respond to any commands after that. For example I try “M280 P4 S10 I1” or “M280 P4 S10” the console responds with a green message like is everything all right but the probe doesn’t deploy at all.

    I followed the instructions
    https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe#Section_BLTouch

    And confirmed “M307 H4 A-1 C-1 D-1” instead of “H3”was the right option over here
    https://forum.duet3d.com/topic/13094/config-tool-m667-m669-and-disable-pwm-channel-bug

    Thanks in advance

    ; Configuration file for Duet WiFi (firmware version 2.03)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.3 on Thu Nov 28 2019 16:04:13 GMT+0000 (Hora padrão da Europa Ocidental)

    ; General preferences
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"AA 300x300x600" ; set printer name

    M667 S1 ; select CoreXY mode

    ; Network
    M551 P"AA" ; set password
    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 Z4000.00 E92.60 ; 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 X1750 Y1750 Z1750 E1750 I30 ; set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Axis Limits
    M208 X0 Y15 Z0 S1 ; set axis minima
    M208 X290 Y295 Z585 S0 ; set axis maxima

    ; Endstops
    M574 X1 Y1 S0 ; set active low and disabled endstops
    M574 Z1 S2 ; set endstops controlled by probe

    ; Z-Probe
    M307 H4 A-1 C-1 D-1 ; disable heater on PWM channel for BLTouch
    M558 P9 H0.5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
    G31 P500 X25 Y0 Z2.5 ; set Z probe trigger value, offset and trigger height
    M557 X20:270 Y20:275 S20 ; define mesh grid

    ; Heaters
    M305 P0 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 0
    M143 H0 S110 ; set temperature limit for heater 0 to 110C
    M305 P1 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 1
    M143 H1 S280 ; set temperature limit for heater 1 to 280C

    ; Fans
    M106 P0 S0 I0 F500 H-1 ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I0 F500 H1 T45 ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on

    ; Tools
    M563 P0 S"Extr 1" 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
    T0 ; select first tool

    ; bed.g
    ; called to perform automatic bed compensation via G32
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.3 on Thu Nov 28 2019 16:04:13 GMT+0000 (Hora padrão da Europa Ocidental)
    M561 ; clear any bed transform
    G29 ; probe the bed and enable compensation

    ; deployprobe.g
    ; called to deploy a physical Z probe
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.3 on Thu Nov 28 2019 16:04:13 GMT+0000 (Hora padrão da Europa Ocidental)
    M280 P4 S10 I1 ; deploy BLTouch

    ; retractprobe.g
    ; called to retract a physical Z probe
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.3 on Thu Nov 28 2019 16:04:13 GMT+0000 (Hora padrão da Europa Ocidental)
    M280 P4 S90 I1 ; retract BLTouch



  • post a picture of your wiring on the duet





  • BL OUT (white) – Z PROB IN @ Duet

    BL GND (black) – GND @ Duet

    BL 5V (red) – PIN1 5V @ Duet

    BL GND (brown) – PIN2 GND @ Duet

    BL Control (yellow) – PIN8 (Heater 3) @ Duet

    Is this correct?

    Just to confirm, as my BL Touch is a 3.1 version, I don’t need to do anything regarding 3.3 / 5v logic voltage, right?


  • administrators

    It looks to me that you have the BLTouch control wire connected to the Heater 3 expansion pin, which is not the same as the E3 heater pin (it's the E2 heater pin). In which case, you need H3 in your M307 command, and P3 in your M280 commands - exactly as the instructions say.



  • @dc42
    Thaks for the help, I gess It solved the problem!


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