IR probe and Duet Maestro

  • Hi, I've recently upgraded my Duet 0.8.5 to the Duet Maestro and while wiring my IR probe (the same one I had used before) I noticed it only blinks twice instead of four times at power up. It does seem to work - homes correctly and outputs a height map, don't know if the readings are correct though.

    What am I missing?

    Using RRF 2.01 and AUS3D v1.4 Z probe.

    I've checked the wiring: analog output<->z probe in, vcc<->3.3v, gnd<->gnd.


  • administrators

    What probe type do you have selected in your M558 command in config.g?

  • This is my M558 command in config.g:

    M558 P1 H5 F120 T6000

    And my full config.g:

    ; Configuration file for Duet Maestro (firmware version 1.20 or newer)
    ; executed by the firmware on start-up

    ; General preferences
    M111 S0 ; Debugging off
    G21 ; Work in millimetres
    G90 ; Send absolute coordinates...
    M83 ; ...but relative extruder moves
    M555 P1 ; Set firmware compatibility to look like RepRapFirmare
    ; Automatic saving after power loss is not enabled
    M208 X0 Y0 Z0 S1 ; Set axis minima
    M208 X210 Y205 Z195 S0 ; Set axis maxima

    ; Endstops
    M574 X1 Y1 S1 ; Set active high endstops
    M574 Z1 S2 ; Set endstops controlled by probe
    M558 P1 H5 F120 T6000 ; Set Z probe type to unmodulated and the dive height + speeds
    G31 P500 X0 Y19.22 Z2.850 ; Set Z probe trigger value, offset and trigger height
    M557 X10:210 Y20:200 S20 ; Define mesh grid

    ; Drives
    M569 P0 S0 ; Drive 0 goes backwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S0 ; Drive 2 goes backwards
    M569 P3 S1 ; Drive 3 goes forwards
    M350 X16 Y16 Z16 E16 I1 ; set 16x microstepping with interpolation
    M92 X80 Y80 Z400 E831 ; Set steps per mm
    M566 X1200 Y1200 Z60 E300 ; Set maximum instantaneous speed changes (mm/min)
    M203 X12000 Y12000 Z600 E3600 ; Set maximum speeds (mm/min)
    M201 X3000 Y3000 Z50 E1000 ; Set accelerations (mm/s^2)
    M906 X1000 Y1000 Z1000 E1300 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    M671 X110:15:205 Y15:195:195 P0.5

    ; Heaters
    M305 P0 T100000 B3950 C0 R2200 ; Set thermistor + ADC parameters for heater 0
    M143 H0 S120 ; Set temperature limit for heater 0 to 120C
    M307 H0 A131.4 C339.7 D1.0 B0 ; Set PID parameters for heater 0 (bed) at 60C
    M305 P1 T100000 B4725 C7.060000e-8 R2200 ; Set thermistor + ADC parameters for heater 1
    M143 H1 S280 ; Set temperature limit for heater 1 to 280C
    M307 H1 A361.8 C225.6 D5.8 B0 ; Set PID parameters for heater 1 (hotend) at 210C

    ; Tools
    M563 P0 D0 H1 ; 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

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

    ; Custom settings are not configured

    ; Miscellaneous
    T0 ; Select first tool

  • administrators

    That config looks ok to me. I have one of our own IR sensors in my Maestro-powered Ormerod printer. I am fairly sure it flashes four times at power up, but I'll check next time I use it.

  • administrators

    I have confirmed, an IR sensor connected correctly to the Duet Maestro in my Ormerod printer flashes 4 times at startup, using P1 in the M558 command.

  • Thanks, but would it be a problem for my printer? The two flashes mean digital output, but I'm using the analog output anyway, am I right?
    If it's a problem, what else should I look into?

  • administrators

    Something isn't right, however the probe will still work even if the Duet is configured for analog mode and the IR sensor is producing a digital output. You won't get the benefit of the probing move slowing down when the probe gets close to trigger height.


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